Is tap water pure?

10/27/2010

 
Well, over the last few weeks you've been researching different scientific materials, reviewing data from different sources about attributes of tap water and planning your experiment to prove or disprove your hypothesis related to 'Is tap water pure?'
Now, its time to show what you've learned.
First, please try to present your work in a different way than you did last time.  If you simply typed your response, then why not try visual aids (pictures, diagrams, charts) or using the audio feature on your website.  You can record your response as an .mp3 file and upload it onto your website.  Then, send me a link to your site as your reply to this assignment.
Second, be sure to choose a different rubric than the one you chose for your last assignment.  By choosing a different rubric the results/response from me will be a little different because I will be analyzing your work in a slightly different way.  This will help you to develop a more broad skill set from which to create future assignments.
Finally, the response options (please choose and respond to only 1):
1. Identify your hypothesis and explain in detail how your evidence (from your observations) proves or disproves your hypothesis. (Don't forget to include references)
2. List all variables you controlled when conducting your experiment and explain how and why you controlled them.  Be sure to identify your independent variable and dependent variable for each experiment you conducted in the lab.  Also, identify all safety requirements necessary to complete this lab without accident or injury and explain why each safety protocol is required.
3. After completing YOUR experimental conclusion, why is the current composition of tap water acceptable for human consumption?  Use your literature research and your experimental data to support your response.
DUE: Blog will be closed on Wednesday, November 17th, 2010, so your assignment must be submitted by this date.
lovepreet g 807
11/3/2010 06:46:44 am

2.when conducting your experiment and explain how and why you controlled them. Be sure to identify your independent variable and dependent variable for each experiment you conducted in the lab. Also, identify all safety requirements necessary to complete this lab without accident or injury and explain why each safety protocol is required.

1. how clean was the container
2.if filter paper and ph paper are clean before use
3.how long the ph paper was held by you
4.how much time you have to do your experiment
5.when i let the water evaporate, it could become contaminated by a cough and sneeze

DEPENDANT VARIABLES
Number 1 variable
Number 2 variable
Number 3 variable
Number 5 variable

INDEPENDANT VARIABLES
Number 4 variable

SAFETY RULES
1.do not be loud or if someone is carrying hot water you may bump into it.
2.do not touch your hot plate or it will burn you.
3.you touch a hot beaker, it can burn you
4.if you touch hot water it can burn you too.
5.if you put your hand over a beaker or flask with hot water, or the steam can give you a third degree burn.
6.a thermometer brakes and it contains mercury it is dangerous.
7.do not touch the light bulb in the microscope or it will burn you as well.
8.dont put a microscope on medium or high.
9. make sur when boiling water, put the water on a flat surface, or it will vibrate of the hot plate.
10.some beaker and flasks can melt, so do not the plastic eill be very hot.
11.if some water spills on electrical equitment(microscope) it can shock you.
rubric 4#

Murwarid 806
11/4/2010 06:32:32 am

Question: #1
Rubric: #3

My hypothesis was that, If I look through the microscope and see other substances in the water, then the water is not a pure substance. The evidence from my observations proves my hypothesis to be right. This is because, when I looked through the microscope, I saw other substances and molecules other than H2O. This affectively proves my hypothesis to be right because, I estimated that if I see other things in the water then it is not a pure substance and I in fact, did see other things in the water & that was the whole point. I did 2 experiments because i wanted to make sure that my results were as accurate as possible. In my second experiment, I tried to boil the water and check the temperature. In that experiment, the temperature of the water was 110 degrees Celsius. In this experiment, I just poured 250 ml of water into a beaker and brought it to a boil then checked it's temperature. My hypothesis for this experiment that, If the temperature of the water is really high, then it will not be pure.
After completing this experiment, I observed if water was a pure substance, and i found out that it is not.

By the way...sorry about the above comment!!

lovepreet g. 807
11/5/2010 06:39:09 am

http://students.weebly.com/weebly/main.php

this is the url to get to my site.
the video takes a while to load but it worked.

Simran M 807
11/9/2010 04:32:36 am



I’d like to be marked by rubric #1
1. Identify your hypothesis and explain in detail how your evidence (from your observations) proves or disproves your hypothesis. (Don't forget to include references)

Hypothesis: If I check to see if water is a pure substance, I will find that water isn’t a pure substance and is a mixture. The observations I made prove that my hypothesis is correct. I performed two tests to make sure my results were accurate. Before I did these two tests, I simply took a magnifying glass and checked for any visible signs that show me that the water is a mixture. When checking with a magnifying glass, I didn’t see anything in the water. For my first experiment, I boiled the tap water. During a previous science class, we boiled pure water and found out that it boiled at 107 degrees. Pure water boils at 100 degrees on ocean level. I know this from prior knowledge and research* I did before conducting the experiment. When I finished conducting this experiment, I found out tap water boils at 110 degrees. To make sure my information was accurate, I asked other people who also boiled the water. The observations prove that my hypothesis was correct. Since the temperature was 110 degrees, I can prove tap water isn’t a pure substance. My next experiment was to simply perform a test using litmus paper. After filling a beaker with tap water, I dipped the litmus paper in the beaker. There weren’t any major color changes, but there was a difference from the normal colour. Pure water has a pH of 7, which is neutral. The colour wouldn’t change at all if it were pure water. In conclusion, this is how my evidence from my observation proves my hypothesis is correct.



References*:
(http://ga.water.usgs.gov/edu/waterproperties.html)

Simran M 807
11/10/2010 05:36:32 am

References*
Nelson Science&Technology
http://www.chem4kids.com/files/matter_mixture.html
http://ga.water.usgs.gov/edu/waterproperties.html

lovepreet g. 807
11/10/2010 09:36:56 pm

sorry i gave wrong link here is real one

http://lovepreetg.weebly.com/

Japreet 807
11/13/2010 03:43:12 am

1. Identify your hypothesis and explain in detail how your evidence (from your observations) proves or disproves your hypothesis.
I would like to be marked by rubric #1.

Hypothesis:If i see any particles that are not part of H2O, then water is not a pure substance.My obsrevations prove that my hypothesis was correct.I ran three tests each under a diferent power under the microscope.Before i did my experiment i checked to see if there were any scratches on the slides already.There were some scratches and they were very faint so i made sure in my observation that I didn't include them.In my first experiment I looked at my water sample under the microscpoe at low power and i could see some little dots in the water.When I lookede at the water sample again but this time at medium power I could see them more clearly, some particles looked like little grains of sand.When I looked closer at high power I could see them clearly.The particles in the water looked black under the microscope.At the end i found that tap water is not pure and to make sure that my results were accurate I asked other people that did the experiment and they got the same answer.

Richard S. 806
11/15/2010 01:41:05 am

My hypothesis is that when i look through the microscope and see other substances that tells me that the tap water is not pure.

Abid link
11/15/2010 05:32:20 am

Question# 1
Rubric# 4

Hypothesis: I believe tap water is pure.

I made this hypothesis because I didnt use scientific evidence at first, but I used real-life experiences. If I've been drinking tap water the whole time, and it was contaminated with any other type of bacteria, would'nt I be sick for a while? However, I was also thinking even though the water isnt pure, can't it still have some sort of good bacteria? Before the experiment, I tested the water with PH paper and a microscope to see if there was any bacteria in it. When I ran my experiment, it showed the same results with the paper and microscope so I knew something went wrong. When I ran it again, I got different results. There were few "specs" floating around when I looked through the microscope. Since the microscope can show the bacteria floating around, I then knew the water was not pure. So, my hypothesis was incorrect and tap water is not pure.



References: http//www.watervalue.com/tapwater.html

Helena 806
11/15/2010 06:19:04 am

Question: 1. identify your hypothesis and explain in detail how your evidence proves or disproves your hypothesis.

My hypothesis stated that, if water was being looked at under a microscope and there is nothing besides H20 in there, then the water is a pure substance. Also if the temperature of the boiling water was over 100 degrees Celsius than the water would not be pure because the boiling point of pure water is 100 degrees Celsius. My observation proves that my hypothesis was correct. There were a few little things inside of the water that are not noticeable with the human eye and so that proved that all three drops of water that were looked at were pure. When 250 ml of water was boiling and the temperature was taken I noticed that the water was 110 degrees Celsius which was close to the boiling point of water. That showed that tap water was pure because we are not exactly at sea level so our answer may not be perfect and so I got 110 degrees Celsius which was pretty decent. Therefore my hypothesis was correct.

Helena
11/15/2010 06:20:00 am

I would like to be mared by rubric # 3

Naman 806 link
11/15/2010 06:42:14 am

Hi mr dobbie! im recording a video right now so wait like 15 minutes then click on my name since i provided the link.

The Pass Is: kang806 :)

prisilla 807
11/15/2010 07:35:05 am

question #1
rubric #3

for my hypothesis i wrote if i boil 200 ml of water and the temperature is 100 degrees celsius then that would mean that water is pure. i know that because,if i boil water at sea level water would be proven pure.so if the temprature of the tap water is over 100 degrees that would be stated that tap water is not as pure as water that is at sea level. As observed if my hypothesis was right or wrong i tested the temprature at the boiling point of the tap water. Temprature i got was 112 degrees celsius. after recording my observation and temprature measured i used a microscope to identify if the particles in the water is 2 hydrogen mollicule and one oxygen.first i put the tap water i didnt boil and observed the result. As i checked there were more then three mollicules so that proved the tap water wasnt pure. After i took the boiled sample and placed it on the microscope slide. I ananlized the other sample there were a few mollicules that were not pure. so overall my hypothesis was correct tap water is not pure because, my researched showed any type of water over 100 degrees celsius is not considerd a pure substance.

refrences: *www.ausetute.com
*www.differencebetween.net/.../difference-between-a-pure-substance-and-a-mixture/ - *www.elmhust.edu/~chm/vchembook/106Amixture

Parth Patel 807
11/15/2010 11:51:30 am

I'd like to be marked on Rubric#1

1. Identify your hypothesis and explain in detail how your evidence (from your observations )proves or disproves your hypothesis.(Don't forget to include references )

Hypothesis: If I check to see that if water is a pure substance or not,I would like to know if water is a pure substance and doesn't have any bacteria then,from the research I did,water is not a pure sbstance.The observations I made to prove that my hypothesis is correct.
I performed 3 tests to make sure that my results were accurate.
For My first experiment,I took one drop of tape water on a glass slide covered with cover slip.I used a magnifying glass and checked the water sample.We can not see anything even thuogh we were trying to see through the magnifying glass.
For my second experiment,I took one drop of tape water on a glass slide and covered it with cover slip.This time I used a microscope.I placed the slide on to the stage of microscope,adjusted the eye piece to see the magnifying image.This time we were able to see the micro organisms (bacteria)present in the tape water sample.Which we can't see by our naked eye or even through the magnifying glass.It proves that water is not a pure substance.
For my third experiment,I took two 250mL of beaker and poured a 100mL of tape water and 100mL of deionised water through the graduated cylinder and boiled it on a hot plate.When I did that,I want to know that boiling destroyed all the micro organisms and algae.Boiling also removes the dissolved gases from water and it gaves no taste.I placed the beaker with water on a hotplate and boiled the water for 10-20 minutes.The purpose of this experiment was to check the boiling point of tape as well as DI water,which water sample has higher temperature.Tape water took 12.25minutes to reach temperature of 101C While DI water sample took 7.15 minutes to reach 95C.These temperature difference and time to reach proves that tape water is not a pure substance,but it is a mixture.
In conclusion from above all data and evidence from my observations,it proved that my hypothesis was correct.

Website References:

1.http://en.wikipedia.org/wiki/graduated_cylinder
2.http://en.wikipedia.org/wiki/hot_plate
3.http://en.wikipedia.org/wiki/microscope_slide
4.http://en.wikipedia.org/wiki/cover_slip
5.http://en.wikipedia.org/wiki/pipette
6.http://en.wikipedia.org/wiki/Filter_paper
7.http://wiki.answers.com/Q/What_is_a_triple_beam_balance_and_is_it_used
8.http://en.wikipedia.org/wiki/Erlenmeyer_flask
9.http://www.microscope-microscope.org/basic/how_to_use_a_microscope.html
10.http://en.wikipedia.org/wiki/Beaker_(glassware)
11.http://www.ehow.com/how_2106155_use_hot_plate.html
12.http://www.tutor.com.my/tutor/ppk/images/form1_sci_e12_1.gif
13.http://en.wikepedia.org/wiki/water
Book References*:

Nelson Science & Technology
Industrial Chemistry By: B.K. Sharma Publishers: Goel Puplishing House Meerut, UP, India

vaishnavan ketheeswaran 806
11/16/2010 03:51:32 am

the time i did my expirenment is 45 min to do my experiment

QUESTION 4

raicah806
11/16/2010 03:59:29 am

rubric:2
question:3
After completing YOUR experimental conclusion, why is the current composition of tap water acceptable for human consumption? Use your literature research and your experimental data to support your response.

After i completed my experiment i found out that water is acceptable for human consmuption. not only did i find this out by my experiment my classmates experiment made me make my dission too. in his experiment his thought his water was contaminated but it was not the tap water it was the dust in the air that went into his water just before he looked into the micro-scope. so no one really had proof for me saying that their water sample was dirty. Plus when we had the water sample we had was in our locker for a week so dust and stuff like that in their water so no matter what we do the water will always look dirty to you because before you even put the water under the micro-scope the water is already getting dust into it.

raicah 806

Prabhdeep
11/16/2010 04:00:29 am

My hypothisis was that if I look through a microscope and see other substances then water is not pure. I saw nothing but H20, but the next time I came in Class I took my water and looked at the same water that I put in the container agian and I saw alot of things that isn't supous to be there I took That water and the clean water and I sarted to boil that water and the water that was a little drity took longer to boil then the clean water. What I found out was that water can take a very long time to get clean and you can make it drity in a second. The water that got drity was because the container I put it in had some dust in it and it wasn't cleaned.You sould always clean your containers proprley or else you can get really sick.

Avinash
11/16/2010 04:00:33 am

Rubric#4
Is Tap Water Pure?
The experiment was to test to see if tap water is pure. Well is tap water pure? A experiment was conducted to see. The experiment was conducted like so.Materials were:1 micoscope 2 cover slips 3 Beaker 4 microscope slides. Procedure: 1. Poured 10 ml of water into a beaker about 50 ml large.2.Put water on the cover slips then onto the microscope.3.Check to see is the molucules are hydrogen and oxygen then tap water is pure. Another experiment was conducted. I boiled 3 samples of water. The first boiled at 103 degrees. The second boiled at 105 degrees and the last bolied at 103 degrees. The median is 103degrees. Tap water is not pure. It has to boil at 100 degrees

Steven 807
11/16/2010 05:08:58 am

Questions:1. Identify your hypothesis and explain in detail how your evidence (from your observations) proves or disproves your hypothesis. (Don't forget to include references)
Rubric : #4
My hypothesis was disproved because my hypothesis was incorrect. My hypothesis was that If water is put into a flask and boiled over a hot plate, then the outcome will be that the water is a pure substance if there is no substance's left at the bottom, but if the temperature goes over 100 degrees then it will also not be a pure substance, we will put the flask on the hot plate for 10 minutes and by the time it will reach 100 degrees. What happened in the experiment was that at pure 12 minutes the temperature got to 100, my hypothesis was a bit off just by 2 minutes because I said it will reach to 100 degrees in 10 minutes but it happened in 12 minutes. That is also when the water started to boil at 12 minutes,when it was 10 minutes the water was just steaming. But there was no substance left at the bottom when the water was boiling, to find this i used a microscope to look at the bottom and check if there was any left over substances.

Sumeet Singh 807
11/16/2010 05:26:57 am

Rubric#4

Is tap water pure?

Method#1

Hypothesis:
I think water is pure. I know this because of past trials.

Take a piece of litmus paper and dip it into the water. If the color changes it is not pure. This clarify if the water is pure or either has more than one subject.

Materials
Flask
Tap
Water
Boiled Water
Tongs
Hotplate
Magnifying glass
Thermometer
Goggles
Pipette
Procedure
1.Gathered Materials
2.Cleaned the flask
3.Poured water into flask(quantity does not matter)
4.Dip the litmus paper into the water.
5.Repeat this with the boiled water
6.If the litmus paper is orange it is non pure and if it is the same color it is pure.
Results
I was right because I have checked on websites and I have conducted the experiment. The litmus paper is the same from before so it does mean that water is a pure substance. My results were that the blue litmus paper stayed the same when it was dried.

Safety tips
1.Always conduct experiment with adult
2.Use tongs for holding hot water
3.Hot plates can get very hot and burn your surroundings.
4.The flask and magnifying glasses can break

Method#2

Hypothesis:
I think water is pure.

Get the materials Hook up the Triple A battery to the alligator clips and to the light bulb. It should light up and the bulb will glow. Next try this with salt water and see if the water can maintain the glow.

Materials:
Alligator clips
Light bulb
Light bulb receptor
Tongs
Hotplate
Saltwater
Litmus paper

Procedure
1.Gathered all materials
2.Test if the simple circuit will work.
3.Turned the tap water into a rolling boil and add salt
4.Hooked the kit with the salt water
5.Turned on kit and test if it works
6.Explain why it works or doesn't work.

Safety Tips
1.Always conduct experiment with adult
2.use tongs to hold hot water
3.Keep work space clear
4.Aware of glass, it breaks and could hurt you if not handled properly

Alexander 806
11/16/2010 06:00:13 am

Question: #1
Rubric: #3

My hypothesis was, If you take a sample of tap water and observe it though a microscope then you would see it is not pure. My hypothesis is correct and my observations state that when looking through the microscope i saw other substances, those substances appeared to be dust, skin flakes, pieces of paper and other substances. These objects were seen through the microscope because I the air is filled with millions of dust particles. The skin flake could of been from me, my peers, my teacher or could of just got recycled into the air and somehow found its way on my slide. The piece of paper is because i used tissue paper instead of lint free paper. Lint free paper is used because it attracts dust and any other substances so your side can be clean and again the other substances could of been from our clothes, hair, air and thing that we counteract with could effect the purity of the water.

I conclude that tap water is not pure.

Twinkle 806
11/16/2010 06:30:23 am

Rubric # 3:
Is water Pure?
Purpose:
I'm doing this experiment because I think it can help me find out whether or not water is a Pure Substance or not.
Materials:
- Cover Slips - Microscope - Filter Paper - Thistle Tube - Aluminum Foil
Hypothesis:
If I test that I put a drop of water onto the microscope slide, then onto the cover slips, then I think that the water will expand faster.
Procedure:
1.) Get a drop of water from the thistle tube and put it on the cover slip
2.) Then, going to see the water under the microscope and check the water
3.) After when that was done, I’m going to record all the data together and check the results
4.) Now, we’re going to check the water with the filter paper
5.) Get a drop of water from the thistle tube and put it on the filter paper
6.) Then check under the microscope if there are any bacteria in there.
7.) Then, record the data again
8.) Now, we get the aluminum foil to check the water
9.) Get a drop of water from the thistle tube and put it on the aluminum foil
10.) Check under the microscope for anything in the water
11.) Record all data together
12.) Then, make an observation chart to make all the data neat, and organized

Mr.Dobbie, the rest I'm going to hand it to you tomorrow which is my observation chart.








Japreet
11/16/2010 06:35:29 am

Mr.Dobbie i forgot to include my references.I used the water textbooks, I went on google and research my materials and how to use them.

Jason 806
11/16/2010 06:51:14 am

1. Identify your hypothesis and explain in detail how your evidence (from your observations) proves or disproves your hypothesis. (Don't forget to include references)

My hypothesis was if i put a water sample(tap water) onto the microscope and see anything other than H2O, then tap water is an impure substance.

First of all, I did two procedures just to confirm/double check if my answer is correct. First I tried viewing the sample under microscope. The microscope can view stuff many more times than the human eye so, i thought this would be useful. First to make sure that the water wasn't contaminated, i cleaned the beaker and refilled it if i left it sit there too long(dust from the air and ceiling). I examined it on high power(400x i believe)and saw some dots. It was a few black circles(nothing inside)spread around the view of the lens. The blacks circles were not H2O because H2O is clear and what i found was black(also H2O has one big oxygen particle and two small hydrogen particles). I repeated the steps to make sure that one wasn't a fluke, i made sure that it was in all tap water. As i repeated, i got same results. I asked people about what they found and they all had something similar or just slightly different. Majority, if not all said that tap water was not pure.

Secondly, I tried another procedure.
Someone asked me to help them so i did. It was the boiling method that you showed in class. Pure water boils at 100 degrees. So, i put some tap water into a round bottom flask i think and did as how you did it. I placed the flask on the hot plate and turned it on. When it starting to boil, i quickly put the thermometer in the flask using those claw like things. I made sure it didn't touch the bottom but stayed at the middle. The temperature was over 100 degrees, at 108-113 degrees, proving it to be impure(difference from 100 degrees).

Other research
I searched on the internet and found some more information. Tap water is cleansed using chemicals such as chlorine. They clean the water by adding specific chemical compounds to adjust the pH and remove contaminants. Also, tap water can appear cloudy sometimes. This is caused by the air bubbles rising. Tap water is also expose to metal corrosion(probably because it goes through pipes constantly). Chemicals are mostly tasteless, odorless and colourless making it hard to notice when you are drinking them.
In conclusion, my hypothesis is correct and tap water is impure.

Sites i used
http://en.wikipedia.org/wiki/Tap_water
http://www.healingdaily.com/detoxification-diet/water-filtration-systems.htm

Jason 806
11/16/2010 06:53:52 am

Oh yeah, mark me on rubric 4 please.

Gurvir 806
11/16/2010 07:09:18 am

Question:#1
Rubric:#4

My hypothesis was tap water is impure and if so i would be able to take any regular water sample and boil it, there would visible water particle left behind that are clearly not pure water. i know this because after i did my procedure i had noticed particles left behind of what could have been dead skin from me or from someone else or maybe even from inside the tap pipe. i believe that the water coming out of the tap is not pure for 2 reason. it could be that the pipes may not be clean or even the water transfered may not be clean causing the the pipes to collect dirt and other things that make water pure get on the pipes. so the next time someone uses the water, the impure water particles mix with the pure water and come out to be impure. i believe i have made an error while doing my experiment because i have done it 4 times. i got the same results 3 of the times. the time i did it wrong was the first time for i had made an error because it was the first time i did a experiment. so i decided to double check my work by doing the experiment again. but this time i had different results of tap water being impure i did it once more and tap water was impure again. then i did it once more just to be sure and the tap water was really impure and it was.every time i looked into the microscope, i could see skin sells and other particles that i had no idea of what they could have been.
then my conclusion was that tap water was impure.

my procedure:

Step one: Got a Beaker of any kind

Step two: Got a Hotplate and placed it on a secured table

Step three: Turned on Hotplate on heats up while setting up my station

Step four: Filled Beaker up to about slightly less then a quarter of half way up with water

Step five: Placed Beaker filled with water on hotplate

Step six: Waited for water to boil and evaporate away until there was no water left

Step seven: Got a pipette and put very little amount of water in the same Beaker

Step eight: mixed water with dirt and dust at the bottom of the Beaker that I evaporated all the water out of and collected sample

Step nine: set up Microscope with Microscope slide and cover slip containing water sample

Step ten: Looked through the Microscope containing water sample and recorded what is observed


Hakem 807
11/16/2010 07:14:03 am

Question: I wasnt to see if tap water is pure or not?
Hypothesis: I think that tap water is pure.
Maerials:
1.Flask that holds 100 ml
2.Hot plate
3.P.H paper
4.Tongs
5.Tap water (100 ml)
6.Pipet
7.Mat
Prcedure:
1.Gathered all materials.
2.Took tap water and filled flask with 100 ml of tap water.
3.Put the beaker on the hot plate.
4.Let the water evaporate for 20 minutes.
5.Took the flask off the hot plate with tongs and placed it on the mat.
6. Took out a sample with the pipet and put it on the PH paper.
7. Waited for the PH paper to dry.
8. After letting it dry looked if made colour diffrence.
9. Collected all obeservations on a piece of paper.
Conclusion:
In conclusion i would like to tell that my hypothesis was correct that tep water is pure. The PH paper remained the same colour. No changes accured on the PH paper all. Also to prove i asked some people about their results of tap water being pure and they got their experiment's conclusions just like I did.

Manvir 807
11/16/2010 07:17:19 am

Question#1
Rubric#1
My hypothesis was that if I compare boiled water to distilled tap water with a microscope, then there would be no difference to the molecules, meaning that the distilled tap water is pure. The observations that I made did not, in fact, prove my hypothesis to be correct. I did two tests with water samples; one with the distilled tap water, the other was the boiled tap water. Before I started, I needed to know how to use a microscope, and I did some research and found a good video on YouTube. When I started the experiment, I first took the distilled tap water and placed a drop of it onto a microscope slide, using a pipette. I looked at the sample through the microscope. At first, I did not see anything, so I took another water sample (distilled tap water, of course) and placed it on another microscope slide. I put it on low power and used the coarse adjustment knobs. I could see some small “bubbles” going around in every which way, but that could have been my eyes playing tricks on me. I turned the knobs a little bit more to get a closer view, and I saw a lot of things that were definitely not just H²O!
Then I boiled some tap water, and waited for it to boil continually. I took the temperature of the water when it started to boil, and the temperature was 108°C. I did a little bit of research when I started this project. I learned that there is such thing as pure water, but tap water isn’t pure water. My research showed this to be right. You see, I read that the earth has been recycling water for a long time. The earth can clean the water but not take out certain viruses and diseases that could be in the water. So, to ensure that humans can consume this water, we added chlorine and other chemicals to “kill” the viruses. Essentially, chlorine isn’t that good for your health. It can cause all types of cancers. I think that you may also find salt and minerals in tap water because if there is any salt or any other minerals in the tap water, then the temperature rises from the 100°C point to perhaps the 105°C point. My temperature that I took of my boiling water was 108°C, so that means that there were some minerals in the tap water.

So, in conclusion, tap water contains chemicals to kill viruses, therefore, tap water is not pure.


References: http://www.articlealley.com/article_685676_17.html
“how to correctly use a microscope” http://www.youtube.com/watch?v=jP9HtcAvGDk
http://www.articlesbase.com/health-articles/what-do-you-need-to-know-about-chlorine-in-drinking-water-773753.html

Deep 807
11/16/2010 07:17:35 am

Questions:1. Identify your hypothesis and explain in detail how your evidence (from your observations) proves or disproves your hypothesis. (Don't forget to include references)

Rubric: #4


My hypothesis was, if you test the boiling point of the water and how long it takes, I though it would take 6 minutes. Also, the boiling point should be at 100 decrese C, after it starts to boil. My hypothesis turned out to be wrong beacuse it took 12 minutes to get the boiling point at 100 decrease C.



Procedure:
1. Collected all the meterials.
2. Placed 150ml of water into beaker.
3. Put the beaker on to the hotplate.
4. Placed themometer in beaker and helf it there.
5. Waited until the water started boiling and recorded the temperature.


Safety Tips
1. Always have a adult see if everything is ok.
2. Use tongs to the hot beakers and themometer.
3. Know how to handel a problem never hide it always tell and adult wht happened.
4. Keep your work space clean and away from your papers




Safety websites:
(How to use my materials)

http://en.wikipedia.org/wiki/hot_plate
http://en.wikipedia.org/wiki/Beaker_(glassware)

sunjit 806
11/16/2010 07:32:57 am

Question 1:Identify your hypothesis and explain in detail how your evidence (from your observations) proves or disproves your hypothesis. And i would be liked to be marked with rubric 1.
My hypothisis is that if I take a tap water sample and I look at it with a microscope, if i see any other particles than H2O that will mean that tap water is not pure, i think tap water is pure. But when I did my experiment I saw other things in my water samples so that disproves my answer, I also boiled water, at 12min and 10 seconds it was a roiling boil, then I meauserd the tempature and 105 degrees. So tap water is not pure

Hakem 807
11/16/2010 07:44:12 am

Mathod #2
Materials:
1.Tripple A batteries (1.5 bolts)
2.2 wires (copper wire)
3.Salt water
4.Beaker
5.Tongs
6.Battery holder
7.Small size light bulb
Procedure:
1.Gathered all materials
2.Took the battery holder and placed the tripple A battery in it.
3. Poured salt water in beaker (as much as you want)
4.Connected the copper wires but put one copper wire in the beaker filled with salt water.
5.Completed the circuit and tested if the light bulb turned on.
6.Collected all obeservations on a piece of paper

Conclusion:
In conclusion I would like to tell that salt water isn't pure. It's not pure because if the light turned on it meant that it wasn't pure. Salt water is mixed with different chemicals or salt which alows it to burst little bolts to creat electricity. But if it didn't light up it was pure because there would be no chemicals or so to burst up something to produce ellectricity. That proves that salt water isn't pure.

I would like to be marked on rubric #3

Refrences:http://www.tutorvista.com/bow/is-salt-water-a-pure-substance

Safety Tips
-Dont touch hot plate when it's hot
-dont touch beaker on hot plate or you will burn yourself
-place your hot plate and beaker on a satbled place
- don not run or bump into someone with afask or beaker
-don not touch if something dangerous is spilled on the floor
-don't leave your hot plate turned on while you're not with it

SUNJIT 806 link
11/16/2010 07:44:31 am

Question number 1 Identify your hypothesis and explain in detail how your evidence (from your observations) proves or disproves your hypothesis. My hypothisis is that if i take a tap water sample and put it on a microscope, if i see that there are other particles and not H2o particles that means tap water is not pure. i think tap water is pure. In the lab i checked teh water sample and found other particles than H2O thatmeans it is not pure. I did another test, i boiled the water sample and it was a roiling boil at 12 min, so ichecked the tempurture and got 105 degrees. so tap water is not pure, i asked other pepole what did they get. I wpuuld be likied o be marked with rubric 1

hakem 807
11/16/2010 07:46:01 am

this one has the rigt spellings
Safety Tips
-Dont touch hot plate when it's hot
-dont touch beaker on hot plate or you will burn yourself
-place your hot plate and beaker on a satbled place
-do not run or bump into someone with a flask or beaker
-do not touch if something dangerous is spilled on the floor
-don't leave your hot plate turned on while you're not with it

Hakem Anjum
11/16/2010 07:47:10 am

And also i used question 1

Renu806
11/16/2010 07:50:10 am

Question 1:
Rubric 4:

My hypothesis was ' if I conducted the experiment using a hot plate to evaporate the water then I think that it will not be a pure substance, so there would be no salt left over in the Erlenmeyer Flask'. The research that I collected stated that only some water is a pure substance. So I tested to see if tap water was a pure substance or not and it wasn't. I know this because at the bottom of the Erlenmeyer flask there was bacteria sticking to the bottom which meant before I tested it already had bacteria roaming inside of the water so it wasn't a pure substance there wasn’t any salt left over but when I scraped the bottom of the Erlenmeyer Flask bits of dirt came off which meant the water wasn’t clean and when the water was boiling all of the bacteria stuck to the bottom of the Flask. The microscope gave me a different answer when I examined to see what was roaming in the water nothing appeared so I thought that tap water really was pure but when I did my actual experiment it wasn’t. Which meant my hypothesis was wrong. It may have been that the water was a pure substance but the fact that I left it in my locker for about a week maybe changed the facts and bacteria could’ve gone inside the container the water it was in. The steps I used to complete this experiment were:

1. Gathered materials required
2. Took microscope and used a pipette to put water on it, to see how water looked.
3. Took out the hot plate and heated it to high.
4. Put water into the Erlenmeyer flask (500mL) and put 50 mL of water
5. Boiled it until it evaporated
6. After water evaporated took Erlenmeyer flask carefully with tongs and cooling mat and placed it on the counter with the cooling mat under it.
7. Exaimined the Erlenmeyer flask to see if there is any salt left over if there is then it was a pure substance.
8. Recorded observations



References:

Book References-

Nelson Science & Technology
Industrial Chemistry B.K. Sharma Publishers: Goel Publishing House Meerut, UP, India

Websites-
http://en.wikipedia.org/wiki/pipette
http://en.wikipedia.org/wiki/hot_plate
http://en.wikipedia.org/wiki/cover_slip
http://en.wikipedia.org/wiki/Erlenmeyer_flask
http://www.ehow.com/how_2106155_use_hot_plate.html


Steven 807
11/16/2010 07:59:52 am

Questions:1. Identify your hypothesis and explain in detail how your evidence (from your observations) proves or disproves your hypothesis. (Don't forget to include references)
Rubric : #4
My hypothesis was disproved because my hypothesis was incorrect. My hypothesis was that If water is put into a flask and boiled over a hot plate, then the outcome will be that the water is a pure substance if there is no substance's left at the bottom, but if the temperature goes over 100 degrees then it will also not be a pure substance, we will put the flask on the hot plate for 10 minutes and by the time it will reach 100 degrees. What happened in the experiment was that at pure 12 minutes the temperature got to 100, my hypothesis was a bit off just by 2 minutes because I said it will reach to 100 degrees in 10 minutes but it happened in 12 minutes. That is also when the water started to boil at 12 minutes,when it was 10 minutes the water was just steaming. But there was no substance left at the bottom when the water was boiling, to find this i used a microscope to look at the bottom and check if there was any left over substances.

Refrences:
http://answers.yahoo.com/question/index?qid=20060830173315AAMjXM5

Ricky Dusanjh 807 :)
11/16/2010 08:08:04 am

Question:1
Rubric:4

My hypothesis was if i test to see the boiling point it would be 125 c and also I Thought it would take me 10 minutes. Clearly that was wrong because when I did my experiment it turned out to take 12 minutes and it started to boil (heavily) at 100 c.

Procedure
1. gathered all materials needed
2. Placed 150ml water into the beaker.
3. Placed the water on to the hot plate.
4. Placed the thermometer in beaker and held it, so it didn't touch the bottom of the hot plate. ( i did that because if i didn't i wouldn't be gathering the temperature of the water i would be getting the temperature of the hotplate.
5.Wait until water starts boiling and recorded temperature

Materials
1. timer
2. thermometer
3. beaker
4. hotplate
5. water faccet

Safety Tips
1. Always have a adult see if everything is ok.
2. Use tongs to the hot beakers and themometer.
3. Know how to handle a problem. Meaning don't hide the problem tell a teacher/adult right away
4. Never make a lot of noise because someone could be walking with hot water and you cant hear them and you knock them over


Rubina 807
11/16/2010 08:18:45 am

1. Identify your hypothesis and explain in detail how your eveidence (from the observations)proves or disaproves your hypothesis.

My hypothesis is that that If tap water was not pure then it would not be pure. But after the experiment and observations it had proven that my hypothesis was incorrect. It was proven incorrect because after reaserching on it I had found out that there is minerals and salt found in tap water. Also when i was doing my experiment i had used the litmus paper and put it into the water and it changed colour by just a bit. Also i thought that boiling the water would make the tap water pure. But it did not. I had researched on it and it had stated that it only takes away a little bit of the salt but not all of it. So overall my hypoethsis had been incorrect.

Rubina 807
11/16/2010 08:21:54 am

Refrences:

http://www.google.ca/

http://wiki.answers.com/Q/Can_Tap_water_be_a_pure_substance

http://www.cycfoundation.org/concepts/PureSubstance

And i want you to mark me using the fourth rubric

Yasmeen 807
11/16/2010 08:29:54 am

Question # 1: Identify your hypothesis and explain in detail how your evidence(from your observation}proves of disproves your hypothesis

Rubric # 4

Hypothesis: if water is only made of water particles, then maybe it can be a pure substance. During my experiment the boiling took a bit long{12.47 seconds}.My observations were that it was boiling for a long time.

Materials:
1.hot plate
2.beakers [400ml,250mL,150mL}
3.timer
4.thermometer

Procedure:
1. gathered all the materials needed
2. filled up with water to 250mL beaker 500mL
3. put it onto the hot plate and waited to start boiling
4. placed the thermometer in the beaker to record my temperature

Conclusion: In my conclusion, my hypothesis was correct and a pure substance

References:
http://en.wikipedia.org/wiki/Hot_plate

Pawanpreet Pannu 806
11/16/2010 08:31:12 am

Question 1
rubric #3

1. Identify your hypothesis and explain in detail how your evidence (from your observations) proves or disproves your hypothesis. (Don't forget to include references)

My hypothesis: If I use a microscope and see if the substance consists of only one component, then I will know water is a pure substance, and if not, then water is not a pure substance. I think water is a pure substance.

My hypothesis was incorrect because I said that water is a pure substance, when water is not a pure substance. To prove that my hypothesis was incorrect, I did the same experiment 2 times to get a accurate more accurate result.

First experiment, I got a microscope and placed it on a table carefully. I put 10ml of tap water into a container. Got a microscope slide and placed it on the stage of the microscope. I got a pipette and I put it into a container and took a drop of water. I put the drop of water onto the microscope slide. I got a cover slip and put it over the substance (water). I looked through the eye piece. I changed the lens by switching the objective lenses. If I saw something in the water that means that water is not a pure substance and if I saw nothing that means water is a pure substance. What I saw was some black dots and something green in the water. If there was nothing in the water then, I would have known that water is a pure substance, but since I did see something in the water, that means water is not a pure substance.

Second experiment, I did the same thing for my second experiment has I did for my first. But for my second experiment I saw was some black circles (could have been air bubbles)and some black dots. If there was nothing in the water then, I would have known that water is a pure substance, but since I did see something in the water, that means water is not a pure substance.

References:
http://www.csudh.edu/oliver/demos/pipetuse/pipetuse.htm
http://www.microscope-microscope.org/basic/how-to-use-a-microscope.htm
http://shs.westport.k12.ct.us/mjvl/biology/microscope/microscope.htm
http://en.wikipedia.org/wiki/Cover_slip

My Experiment

Is Water a Pure Substance????

Purpose: To find out if water is a pure substance.

Hypothesis: If I use a microscope and see if the substance consists of only one component, then I will know water is a pure substance, and if not , then water is not a pure substance. I think water is a pure substance.

Materials:
1.Microscope
2.Microscope slides
3.Cover slips
4.Container
5.10ml of tap water
6.Table
7.Pipette
8.Observation chart

Procedure:
Step 1: Got a microscope and placed it on a table carefully
Step 2: Put 10ml of tap water into a container
Step 3: Got a microscope slide and placed it on the stage of the microscope
Step 4: Got a pipette and put it into a container and took a drop of water
Step 5: Put the drop of water onto the microscope slide
Step 6: Got a cover slip and put it over the substance (water)
Step 7: Looked through the eye piece
Step 8: Changed the lens by switching the objective lenses
Step 9: Recorded what I saw on to a observation chart
Step 10: If I saw something in the water that means that water is not a pure substance and if I saw nothing that means water is a pure substance

Observation chart: I will bring it to school


Simranjit Gill 806
11/16/2010 08:37:53 am

Question: 1. identify your hypothesis and explain in detail how your evidence proves or disproves your hypothesis.
I would like to be marked by rubric number 3.


My hypothesis was: If I conduct my experiment using tap water, I will probably find out, that tap water is not a pure substance, because all water companies clean put the water, to get rid of the bacteria. Fresh water, is not a pure substance.


My hypothesis, was not correct, because I had thought, that all of the water wouldn't have evaporated, but it did evaporate, after it was on the hot plate for a long time. When I checked the temperature of the water, it was 98 Degrees Celsius. That means, that the water was really hot, and that you could not touch it.

My procedure was:
1. Took out all of the materials you needed.
2. Got the Hot Plate out, and placed it on a flat, direct straight surface.
3. Filled up the Beaker to about 200mL.
4. Placed the Beaker onto a hot plate.
5. Waited for water to start boiling.
6. If all of the water evaporated, then the water was pure.
7. If all of the water did not evaporate, the was was not pure.
8. Waited for your Hot Plate to cool, down, and then put all of the materials away safely.

Parmeet link
11/16/2010 08:38:44 am

Rubric:3
Question:1
My hypothesis was "If I put water on the microscope and examine it then I will find out that water is pure.

The evidence from my observation can prove that my hypothesis is wrong. I did two attempts. Both of the trials had different types of particles on it. This had meant that tap water is not pure.On the first one more air bubbles where on the slide than the last one. The last one I made sure that it was clean so the examination accurate. When I looked through the microscope and I saw different particles.

In Conclusion:
I reject my hypothesis, it was wrong because water is not pure. Also because I saw different particles through the microscope. Therefore I can conclude that water is not pure.

1. Gathered materials.
2. Got the microscope.(hold with care)
3. Got the microscope slide and mounted it on the microscope.
5. Poured water in the beaker.
6. Used pipette and sucked a drop of water.
7. Put one drop of water on microscope slide and covered it with cover slip.
8.Examined the drop of water on microscope slide.
9. If there was only one kind of particle, then it was pure.



Sonpreet Mann 806 link
11/16/2010 08:45:38 am

Rubric #3,
Question 1. Identify your hypothesis and explain in detail how your evidence (from your observations) proves or disproves your hypothesis.

Hypothesis: i believe that when you examine Tap water through the microscope, you will not see only 1 component but more.

Materials:
-Microscope
-Microscope Slides
-Beaker
-Funnel
-Cover Slips

Procedure:
1) Set up the microscope
2) filled the beaker with 20ml of water
3)Take a dropper and fill the dropper with water 10ml
4)look through the ocular lens (eye piece) then adjust the microscope with coarse-adjustment also by fine adjustment
5)Put few drops of water under the microscope slide
6)Observe the microscope and see if it only consists one type of component then it is Pure, if not then it isnt as I stated in my hypothesis the tap water would have more than 1 component

Conclusion: My Research and my Experiment Concludes that my hypothesis, that tap water is a mixed substance is true and is correct. For the first time when i observed the slide i saw alot of particles besides H2O, to make my Experiment accurate i did it again. On my 2nd try I saw more then 3 components, stating its mixed. Since my teacher told us that dust or other particles can be on the Slides making experiments inaccurate i decided to clean the slide with Lint free paper. Lint free paper is a paper that cleans the slides so all observations can be accurate used by many scientists.
For my Final examine i cleaned the microscope slide with the lint free paper then i used the dropper and poured 20ml of water onto the slide, turned the microscope on and when i observed. Once again i saw more that 2 components. This time i was sure that my test results would be accurate because i used all the techniques to make sure my results are accurate. In conclusion, my hypothesis was correct and my experiment staes that the tap water is really a mixture of other components.

-Sonpreet 806



Sonpreet 806 Correct version
11/16/2010 09:01:12 am

Is tap water pure?
10/27/201051 Comment(s) Well, over the last few weeks you've been researching different scientific materials, reviewing data from different sources about attributes of tap water and planning your experiment to prove or disprove your hypothesis related to 'Is tap water pure?'
Now, its time to show what you've learned.
First, please try to present your work in a different way than you did last time. If you simply typed your response, then why not try visual aids (pictures, diagrams, charts) or using the audio feature on your website. You can record your response as an .mp3 file and upload it onto your website. Then, send me a link to your site as your reply to this assignment.
Second, be sure to choose a different rubric than the one you chose for your last assignment. By choosing a different rubric the results/response from me will be a little different because I will be analyzing your work in a slightly different way. This will help you to develop a more broad skill set from which to create future assignments.
Finally, the response options (please choose and respond to only 1):
1. Identify your hypothesis and explain in detail how your evidence (from your observations) proves or disproves your hypothesis. (Don't forget to include references)
2. List all variables you controlled when conducting your experiment and explain how and why you controlled them. Be sure to identify your independent variable and dependent variable for each experiment you conducted in the lab. Also, identify all safety requirements necessary to complete this lab without accident or injury and explain why each safety protocol is required.
3. After completing YOUR experimental conclusion, why is the current composition of tap water acceptable for human consumption? Use your literature research and your experimental data to support your response.
DUE: Blog will be closed on Wednesday, November 17th, 2010, so your assignment must be submitted by this date.




Comments
lovepreet g 807
Wed, 03 Nov 2010 1:46:44 pm
2.when conducting your experiment and explain how and why you controlled them. Be sure to identify your independent variable and dependent variable for each experiment you conducted in the lab. Also, identify all safety requirements necessary to complete this lab without accident or injury and explain why each safety protocol is required.

1. how clean was the container
2.if filter paper and ph paper are clean before use
3.how long the ph paper was held by you
4.how much time you have to do your experiment
5.when i let the water evaporate, it could become contaminated by a cough and sneeze

DEPENDANT VARIABLES
Number 1 variable
Number 2 variable
Number 3 variable
Number 5 variable

INDEPENDANT VARIABLES
Number 4 variable

SAFETY RULES
1.do not be loud or if someone is carrying hot water you may bump into it.
2.do not touch your hot plate or it will burn you.
3.you touch a hot beaker, it can burn you
4.if you touch hot water it can burn you too.
5.if you put your hand over a beaker or flask with hot water, or the steam can give you a third degree burn.
6.a thermometer brakes and it contains mercury it is dangerous.
7.do not touch the light bulb in the microscope or it will burn you as well.
8.dont put a microscope on medium or high.
9. make sur when boiling water, put the water on a flat surface, or it will vibrate of the hot plate.
10.some beaker and flasks can melt, so do not the plastic eill be very hot.
11.if some water spills on electrical equitment(microscope) it can shock you.
rubric 4#


Murwarid 806
Thu, 04 Nov 2010 12:53:19 pm



Murwarid 806
Thu, 04 Nov 2010 1:32:32 pm
Question: #1
Rubric: #3

My hypothesis was that, If I look through the microscope and see other substances in the water, then the water is not a pure substance. The evidence from my observations proves my hypothesis to be right. This is because, when I looked through the microscope, I saw other substances and molecules other than H2O. This affectively proves my hypothesis to be right because, I estimated that if I see other things in the water then it is not a pure substance and I in fact, did see other things in the water & that was the whole point. I did 2 experiments because i wanted to make sure that my results were as accurate as possible. In my second experiment, I tried to boil the water and check the temperature. In that experiment, the temperature of the water was 110 degrees Celsius. In this experiment, I just poured 250 ml of water into a beaker and brought it to a boil then checked it's temperature. My hypothesis for this experiment that, If the temperature of the water is really high, then it will not be pure.
After completing this experiment, I observed if water was a pure substance, and i found out that it is not.

By

Jessica 806
11/16/2010 09:39:42 am

Question (#1): Identify your hypothesis and explain in detail how your evidence (from your observations) proves or disproves your hypothesis.

Rubric#4

: My hypothesis stated that that tap water is a pure substance. I had made my hypothesis based on all my background research. I had thought tap water is pure because in my research I had learned that distillation (boiling) is a process that separates mixtures. If the substance is pure then all the liquid will evaporate. If it is not pure then bacteria will be left behind. I also knew from previous work that water (H20) is made up of hydrogen and oxygen which cannot separate because it’s a single component substance. That is why my hypothesis was tap water is pure. But, I had proved my hypothesis to be wrong. With all my observations I had concluded to the fact that tap water is not a pure substance. This is because during my experiment, after I had boiled the water, everything had evaporated as I thought. But, then I noticed that the Erlenmeyer flask was very foggy and gassed up. It was dry, not wet. Most importantly, I noticed that at the bottom of the flask it was extremely dry and there was something left behind. I starting scraping the bottom of the Erlenmeyer flask, and what looked like bacteria came off the bottom of it. This proved my hypothesis to be wrong. This is because from my background research I had learned what I had mentioned before. A mixture will separate during distillation and bacteria will be left behind, which is exactly what had happened.

References:
•Nelson Science & Technology
Industrial Chemistry B.K. Sharma Publishers: Goel Publishing House Meerut, UP, India

•http://en.wikipedia.org/wiki/Distilled_water

•http://www.cycfoundation.org/concepts/PureSubstance





Simmy Kharodh 806
11/16/2010 09:51:28 am

Is Tap Water Pure?
Question
1. Identify your hypothesis and explain in detail how your evidence proves or disproves your hypothesis.
Rubric
#3
Purpose
The purpose of this experiment is to find out whether tap water is pure or not.
Hypothesis
If approximately 50mL of water is placed into a beaker and onto a hotplate, then all the water will not evaporate because water has 2 elements in it. It has 2 elements of Hydrogen and 1 element of oxygen.
Materials
 Hot plate
 Beaker
 Thermometer
 Tongs
 Tap water
 Cooling mat
Procedure
1. Gathered all materials
2. Poured 50mL of tap water in a beaker
3. Turned hot plate on to full heat
4. Placed the beaker on the hot plate
5. Waited until the water started to boil
6. Checked the temperature with thermometer, when rolling boil accrued
7. Recorded temperature
8. Waited until water evaporated
9. Recorded if water evaporated or not
10. Placed beaker on cooling mat with tongs
11. Used tongs to spilled water in sink if it did not evaporate
12. Repeated steps 2-11 two more times
13. Unplugged hot plate and waited until it cooled down
14. Put away all materials safely
Conclusion
In my hypothesis I stated that tap water is not pure because it has two elements to it; hydrogen and oxygen (H2O). After I completed my procedure I found that Tap water is pure. The boiling point for water is 100 Celsius and in my experiment all the boiling points average was 98 Celsius. That is fairly close. Also due to another experiment I found that substance do not evaporate with water, they get left behind. But in my experiment the substances get left behind. Therefore tap water is pure.

Neillish 807
11/16/2010 09:54:50 am

Question #1
Rubric #3

Hypothesis:My hypothesis is that the water will be pure.

Materials:Beaker
Hot plate
Thermometer

Procedure:Poured water into beaker.
Set beaker on hot plate.
Turned on hot plate waited until water was boiling.
Checked to see if water boiled at 100 degrees.

Conclusion:I was right that the water was pure.

Ishan 806 link
11/16/2010 10:36:01 am

question:Identify your hypothesis and explain in detail how your evidence(from your observation charts) proves o disproves your hypothesis.

Rubric 4


My hypothesis stated that tap water is a pure substance. The evidence that my hypothesis was wrong is that when I checked the evaporated water sample through my microscope I saw some black substances left behind To make sure that the result of my first test was accurate, I did the experiment again cleaning the cover slips, micro scope lenses and then washing out the pipette with tap water and I got the same results. But to make sure that my results of those tests were precise I tested them a third time cleaning everything again and I still got the same result. I know from my background research that if the tap water is pure then all the substances will evaporate but if it is not pure then bacteria or other substances will be left behind. But my hypothesis was incorrect because In my tests in the microscope I saw bacteria left behind.

Safety rules:
1:do not be loud or if someone is carrying something hot and they tell you to move you should move or there is a chance of geting burned or the person holding something hot will get burned.

2:DO NOT touch hot plate when it is on it can burn you

3:a thermometre breaks it can harm you because it has mercury in it.

4:the light under the microscope is hot do not touch it.

5:Do not touch the course adjusment knob when on mediium or high it can crack the lense of the microscope.

refrences: Nelson science and technolgy

krishna chand 807
11/16/2010 10:41:22 am

Science experiment blog if water is pure

2. List all variables you controlled when conducting your experiment and explain how and why you controlled them. Be sure to identify your independent variable and dependent variable for each experiment you conducted in the lab. Also, identify all safety requirements necessary to complete this lab without accident or injury and explain why each safety protocol is required.

Variables
1. Make sure every material is very clean to use in the lab.
2. How much time you wait for the water to boil to see the temperature. If it 101 degrees it will be pure.
3. Make sure that micro slides are clear and not scratch because when it’s scratch your results will not be correct.

4. Is to write down observations in your own words what is happening

Partners help with experiment
1. Variable 1 because it’ll ruin accuracy of sample
2. Variable 3 you can’t see anything


The independent work
1. Variable2 because you have to get a certain amount of time
2. Variable4- to help you with evidence to prove hypothesis is right or wrong

Very important rules for safety in a science lab
1. Do not goof around or else your get consequences’ by Mr.Dobbie.
2. make sure that table is stable
3. don’t hold hot water beaker in your hand because you will get very burned
4. Don’t put paper near the microscope or hotplate because it’ll catch on fire
5. When anything falls o the floor don’t go near it
6. Hold the microscope with two hands or it’ll drop
7. Hold the beaker with tongs you’ll be safe do same thing with the thermometer
8. When done with water pour it down drain
9. Don’t bring anything from home the school provides everything you need for science
10. Focus on your work
11. Make sure you put everything back
12. Wear goggles
13.

savitoj link
11/16/2010 10:47:26 am

2. List all variables you controlled when conducting your experiment and explain how and why you controlled them. Be sure to identify your independent variable and dependent variable for each experiment you conducted in the lab. Also, identify all safety requirements necessary to complete this lab without accident or injury and explain why each safety protocol is required

Variables
1.How long I boiled the water?
2.How clean was the container?
3.How much water was in the beaker?
4.How much drops of water on microscope slide?
5.How long the Ph paper was held?

Dependent Variable
Variable 2
Variable 5
Variable 4
Variable 1

Independent Variable
Variable 3

I controlled how long I boiled the water by using a timer to watch the time. The reason I controlled how long boil the water was if I boiled the water for twenty minutes it’s a waste of my class time. The water will already be boiled by ten minutes.

I controlled how clean the container was by using deionized water to remove bacteria from the beaker. The reason I did this is because if the beaker was dirty my results wouldn’t be accurate.

I controlled how much water was in the beaker by pouring half of the400ml beaker. The reason is when the water is boiling the beaker will shake and if the beaker is filled to the top or nearly to the top the beaker will tip over and the hot water will spill on the floor .

I controlled how much drops of water on the microscope slide by putting one drop. The reason is if I put more than one drop the water will splatter all over the microscope slide and on the cover slip, that when I look through the microscope I only see the water droplets on top of the cover slip.

I controlled how long the Ph paper was held by holding it for three seconds. The reason is if I held it longer the water will get the whole paper wet and my finger will touch the paper. The sample will be worthless because my finger touched it and the finger contains oils so the paper sample is useless.



Safety protocol
1.Do not yell or shout when someone is carrying a beaker full of hot water because you’ll bump into them spill the water on yourself and the person carrying the water will get burned by the water.
2.Don’t touch the hot plate because you don’t know if it’s hot or cold and if it’s hot you’ll burn your hand.
3.Do not touch the beaker when it’s hot or you’ll burn your hand.
4.Don’t put paper near the hot plate or the microscope because it’ll burn.
5.If you are using a hot plate or a microscope and don’t know what you’re doing call for help because you might mess things up.
6.When checking the boiling point of the water there are four important rules one make sure you got a good grip on the thermometer or the thermometer will break free and tip over the hot water. Second do not let go of the thermometer or it’ll tip over the beaker. Third always use tong never use your hands that’s only for teachers and people who have a good grip. Fourth make sure the desk isn’t wobbly because when somebody puts their hand on the desk, the desk could wobble and tip the water over.
7.Don’t touch the microscope bulb because it’ll burn your hand.
8.When the water is boiling make sure it’s flat because as it’s boiling the beaker will wobble left and right and if it’s not flat it could tip over.
9.If the boiling water spills onto your jacket take the jacket off immediately or the water will burn you.
10.Always hold the microscope with two hands because if you bump into someone the microscope will fall and become damaged.
11.Make sure the water doesn’t spill on electrical equipment because it’ll shock you.
12.If an item falls down on the floor and breaks don’t touch the broken pieces because it’ll cut your skin.
13.Don’t bring beakers from home because at a hot temperature the beaker will melt. The beakers at laboratories are made with a special type of glass that doesn’t melt at high temperatures.
14.Don’t leave items near edge because if someone bumps the desk the item might tip over and the item will break

References
http://www.ehow.com/how_5938833_adjust-microscope.html
http://www.ehow.com/how_378_test-water-purity.html
http://www.ehow.com/how_2110587_salt-water-freshwater-drinking-water.html
http://www.ehow.com/how_2106155_use-hot-plate.html
Textbooks
Nelson Science Textbook


savitoj link
11/16/2010 10:48:45 am

I'd liked to be marked with rubric 4

krishna chand 807
11/16/2010 10:51:57 am

mr dobbie i forgot the rubric for the lab which is rubric 4 and right below is the chart for the lab if water is pure above the one i sumit is the blog response which the qustion was #2 to go with the results to the chart that i did in class foe science.

Science experiment if water is pure!

Hypothesis: if I test to see if tap water is pure then when you boil it and check by a microscope it will be pure.
Material:
• Microscope
• Hot plates
• Filter paper
• Microscope slide
• Pipettes
• Beaker (150ml)
• Magnify glass
• Timer
• thermometer


Method/procedure
• gathered materials
• filled water in beaker (150ml)
• Putted the beaker with the water on hot plate and turned hot plate on.
• Recorded temperature at boil
• letted it boil for at least 10 minutes
• used a pipettes to lift the beaker
• putted the boiled beaker under the microscope
• checked to if there’s any bacteria
• see if it’s pure water
Sample 1
1:12bubbles started to form

4:00 it started to boil
6:12 temperature 101 degrees Celsius
Bubbles are rising faster
8:03 double check still 101 degrees Celsius
No color changed
Pure water
Fog is on the glass
Steam is rising quickly
Demonized water

Sample 2
Tap water

No color change

Demonized water
1:35 little bubbles forming


2:31 bubbles are rising slowly
5:36 little steam started to form
7:27 bubbles are rising quickly
8:12boiling boil
8:50 boiling boil
9:42 steam raises
Temperature is 100 degrees
(99.9%)
Pure water

Sabreena 806 link
11/16/2010 11:17:09 am

Question #1
Rubric #3

My hypothesis before conducting the, "Is Tap Water Pure" experiment is that, If I conduct my experiment by looking into a microscope at different magnifications (x4,x10,x40), looking at tap water, and I see something in the water, then tap water is not pure. I will find that tap water is not a pure substance because, the water that comes from the tap was first cleaned by some companies using some cleaning substances which go into the water, mixing in with it, causing the water to be mixed with other substances making the tap water not a pure substance. Conducting the experiment proved my hypothesis to be correct. I found out that tap water is not pure because I used,
(Materials)
- tap water
- microscope
- microscope slides
- cover slips
- beaker
- pipette
and
(Procedure)
1. Washed hands with soap (so if water is touched by accident, not a lot of bacteria will enter the water
2. Gathered all materials
3. Turned on the tap water
4. Poured 200mL of tap water into a clean beaker
5. Cleaned microscope slides with lint paper
6. Placed microscope slides on the microscope
7. Rinsed pipette
8. Placed a drop of tap water, using a pipette onto the microscope slide
9. Cleaned cover slips with lint paper
10. Placed cover slips over top of the drop of water
11. Looked into the microscope at different magnifications (x4,x10,x40)
12. Looked into the microscope or any other substances
13. Repeated experiment 2 more times for more accurate results
14. Determined whether tap water was pure or not
after I completed all of that, I have noticed in my observation charts that when I was looking into the microscope I didn't see any other substances at x4 magnification, but when I looked at the x10 magnification, I saw a couple 'dots'. Finally, when I was looking in the x40 magnification, each time I saw at least 2 or more black 'dots' in the water. By conducting this experiment I found out tap water is not pure. To find out if my experiment was correct, I searched some websites and found out that when companies filter the water so it could be used from the tap, people had found fluoride and chlorine in the water, which are mixed in with the water, and when something is mixed with other substances it is not pure. Tap water is not pure.

References:
http://www.healingdaily.com/detoxification-diet/water-filtration-systems.htm

http://www.articlesbase.com/accessories-articles/chemicals-in-tap-water-health-risks-you-face-567927.html

http://www.gtawater.com/


(On my website, I have pictures of my observations charts)

Lovepreet S. 807
11/16/2010 11:26:21 am

Question #1: Identify your hypothesis and explain in detail how your evidence (from your observations) proves or disproves your hypothesis. (Don't forget to include references)

Rubric #1

Hypothesis: If I test to see if tap water has a boiling point of 100 degrees Celsius while timing it, I think it would be 100 degrees (pure) and about 8 minutes. I know this experiment will be answering the question is tap water pure because if water has a boiling point of 100 degrees Celsius than it is pure.

My hypothesis was correct for the most part. It states that tap water will be pure. According to my research and observations, I found out that tap water is pure. What I did was:
1) Gathered all materials
2) Poured 150 ml of tap water into beaker
3) Placed the beaker on hotplate
4) Held a thermometer with tongs in the beaker, didn’t let it touch bottom
5) Started timer and recorded temperature every minute or more
6) Waited until the boiling point came and recorded the time and temperature
7) Took off beaker with tongs

When the experiment was complete I saw that the tap water`s boiling point was 100 degrees Celsius. This proves that tap water is pure because I researched that fact and it turned out true. According to my observations the water started boiling heavily at 100 degrees Celsius, so I concluded it was pure.

Another thing that was said in my hypothesis was that it would take 8 minutes to boil. This was the part of my hypothesis that was incorrect. That is why I said my hypothesis was for the most part correct. It actually started to boil at 12:00 minutes. This part of my experiment isn’t relevant to the question but it is an addition to it. I could’ve made some changes or addition to my procedure to make it more accurate that tap water is pure. For example, I could’ve added using Litmus strips. After step 1 in my procedure I could’ve used the litmus paper before I boiled it to check if the tap water is pure. I would’ve done it before I boiled it because I’m not sure but it could’ve tampered with the purity of the water. Overall my hypothesis was approved except for the fact that I said 8 minutes when it was 12.

References:

Author: Anne Marie Helmenstine
Date researched: October 18th 2010
URL: http://chemistry.about.com/od/howthingswork/f/boiling-point-of-water.htm
Summary: Basically saying the boiling point of pure water is 100 degrees Celsius, and the purity of the water affects the boiling point

Author: an eHow Contributor (no author name)
Date researched: October 26th 2010
URL: http://www.ehow.com/how_2106155_use-hot-plate.html

vaishnavan ketheeswaran 806
11/16/2010 12:54:02 pm


i found out was that when i kept my water for long is that when i checked my water after a week i saw black stuff moving around and i double checked it with new water it was clean so water is pure substance

sukhpreet 806 link
11/16/2010 08:16:33 pm

mr. dobbie i have made a video. this is the link to my website: http://a434.weebly.com/portfolio.html.
mr. dobbie make sure u scroll down until the science section on my website

p.s the pass is kang806

L Holwerda
11/16/2010 10:02:41 pm

Are These Web Sites Bogus?

Research into Twinkies:
http://www.twinkiesproject.com/

Endangered Guinea Worms:
http://www.deadlysins.com/guineaworm/index.htm

Cloning Technology:
http://www.d-b.net/dti/

Explorers:
http://www.allaboutexplorers.com

California’s Velcro Crop Under Challenge: http://home.inreach.com/kumbach/velcro.html.
Dihydrogen Monoxide:
http://www.dhmo.org

Dog Island Free Forever:
http://www.thedogisland.com.
Feline Reactions to Bearded Men: http://improbable.com/airchives/classical/cat/cat.html

The Pacific Northwest Tree Octopus:
http://zapatopi.net/treeoctopus.html

Victorian Robots:
http://www.bigredhair.com/robots/index.html

Sidharth Goyal 807
11/17/2010 01:10:44 am

1. Identify your hypothesis and explain in detail how your evidence (from your observations) proves or disproves your hypothesis. (Don't forget to include references)

Hypothesis: I consume the tap water is a pure substance. Its means that it’s not mixture of any chemicals / bacteria.

I performed 2 experiment to prove that my hypothesis were accurate.
#1
Material
1) Beaker. 2) Hot plate. 3) Pipettes. 4) PH paper. 5) Tongs. 6) Hot plate mat. 7) Tap water
Procedure #1
1) Gathered all materials
2) Took top water sample on PH paper and looked if it was pure or not pure (when I put water on ph paper in, I checked does the ph paper it its appearance or not)
3) Filled beaker with 100 ml of tap water
4) Put the beaker on the hot plate and waited till it boiled
5) Turned off my hotplate and took the beaker off the hotplate with tones and placed on the hot water mat
6) took a pipette and took a sample of the hot water and put the sample on the ph paper (to check does it change it look)
7) Compared the both of the samples tap water and boiled water

In conclusion, when I was comparing both of my sample there was no difference. So that means that the tap water is pure substance. I also tried saltwater to compare , the salt water turned out to be impure. This proves my hypothesis is correct.

References
http://www.ehow.com/how_2106155_use-hot-plate.html http://www.ehow.com/how_4745261_use-ph-paper.html
http://en.wikipedia.org/wiki/Distilled_water
http://en.wikipedia.org/wiki/Hot_plate
http://en.wikipedia.org/wiki/pipette
http://www.sciencebuddies.org/
http://en.wikipedia.org/wiki/microscope_slide
http://en.wikepedia.org/wiki/water
3 )After completing YOUR experimental conclusion, why is the current composition of tap water acceptable for human consumption? Use your literature research and your experimental data to support your response.

Material
1) Beaker. 2) Hot plate. 3) Pipettes. 4) PH paper. 5) Tongs. 6) Hot plate mat. 7) Tap water
Procedure #1
1) Gathered all materials
2) Took top water sample on PH paper and looked if it was pure or not pure (when I put water on ph paper in, I checked does the ph paper it its appearance or not)
3) Filled beaker with 100 ml of tap water
4) Put the beaker on the hot plate and waited till it boiled
5) Turned off my hotplate and took the beaker off the hotplate with tones and placed on the hot water mat
6) took a pipette and took a sample of the hot water and put the sample on the ph paper (to check does it change it look)
7) Compared the both of the samples tap water and boiled water
This means tap water if acceptable for human consumption. The ph paper had no difference between before and after.
Safety tips :

1.Always conduct experiment with adult
2.use tongs to hold hot water( if u pick it up with hands it will burn your hands
3.Keep work space clear
4.Aware of glass, it breaks and could hurt you if not handled properly
5. hold the ph paper form the end because it will affect you experiment
References
http://www.ehow.com/how_2106155_use-hot-plate.html http://www.ehow.com/how_4745261_use-ph-paper.html
http://en.wikipedia.org/wiki/Distilled_water
http://en.wikipedia.org/wiki/Hot_plate
http://en.wikipedia.org/wiki/pipette
http://www.sciencebuddies.org/
http://en.wikepedia.org/wiki/water

pavan 806
11/17/2010 01:34:02 am

Question #1
Rubric #3

My hypothesis was that if i looked through the microscope three different times and saw different particles that would mean that tap water isn't pure. the first time i looked through the microscope at low power, the particles were not clear enough for me to decide if water is pure or not pure. so i looked through the microscope again at medium power, the particles were more clear but still not enough for me to decide if water is pure or not. so i looked thorough the microscope again at full power i saw more than one particle. at the end i found out that tap water isn't a pure substance.

Naman Madan 806 link
11/17/2010 01:40:16 am

I would be liked yo be marked on
1. Identify your hypothesis and explain in detail how your evidence (from your observations) proves or disproves your hypothesis. (Don't forget to include references)

Ok, so my hypothesis was that if i look through a microscope then i would see that water is a pure substance i would only see H2O or water molucles but when i looked through the microscope i only found bacteria or something that looked like bacteria but i coldn't identify it.I ran my test around 6 times the first three try's i did without a container. It was straight through the tap water. The other 3 tryes i did with the coatiner i also took control by washing the container and drying it properly. I also took other poeples observations like one of my frinds was using a hotplate and a beaker and they recirded tempratures tha were 108-113 degrees celcius and the boiling pint of water is 100 degrees celcius. So my hypothesis was wrong stating tap water was pure when it's really not.


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