Tuesday, 10 December 2013

Cool Air Sampling Pump, More Investigations, and the Science Fair

As usual, we started class with the class agenda:

Next, Mr. Pro demonstrated an air sampling pump (LaMotte) that Mr. Broderick left before he left. We have concluded that the air in Mr. Pro's classroom was pretty clean. 




After, we collected our diagrams back and checked how much we got on it. We were given feedback from Mr. Pro. Overall, everybody did a great job. Some of the best diagrams were volunteered for show just above the lockers outside Mr. Pro's classroom.


As we put our diagrams in a safe place, we moved on to the 6 part investigation which we spent most of our class time on. As we always do, we went over the methods of each investigation while Mr. Pro demonstrated.
Method A:
Transfer Water with a Straw
  1. Put the straw in the water.
  2. Place your finger or thumb on top of the straw.
  3. Move the straw to another container and let your thumb go.
  4. Try using different objects to seal the straw.  
Method B:
Balloon Cups
  1. Wipe off the balloon.
  2. Inflate the balloon partially.
  3. Pinch the balloon so no air escapes.
  4. Get a partner to put one cup on the end of the balloon.
  5. Inflate the balloon more.  
  6. Predict what will happen to the cups.
Method C:
The Heavy Newspaper
  1. Be sure the ruler is under the newspaper and the ruler is about 2-3 cm from the end.
  2. Strike the ruler with your hand.
  3. Predict what will happen to the newspaper and ruler.
Method D:
The Magic Beaker
  1. Crumble a very small piece newspaper and put it in a small beaker.
  2. Light the newspaper and put it in the beaker.  Do this over a container, so if you drop the glass it doesn’t break.
  3. immediately put your hand over the beaker and seal it.  Be careful not to burn yourself.
Method E:
The Live Balloon
  1. Heat up lots of water using the kettle.
  2. Put the water into the big beaker.
  3. Cool off the test tube by running it under tap water or by putting it in ice water.
  4. Place gently the glass test tube into the beaker.
Method F:
The Candle Under the Jar
  1. Get a timer ready.
  2. Predict how long each candle will burn under each containers.
  3. Light the candles and simultaneously put the containers on top.
  4. Record the time at which each flame goes out.
  5. Predict which container will burn the longest.

During the preparation and demonstrations, we wrote down our predictions. When we were done recording our predictions, we grabbed our goggles and paired up to being the investigation.








Method A:
       Transfer Water with a Straw
 












Method B:
       Balloon Cups














Method C:
       The Heavy Newspaper


Method D:
       The Magic Beaker

















Method E:
       The Live Balloon













Method F:
       The Candle Under the Jar













Observations
After we have investigated, we put down observations we made for some methods on the bottom of the method document.

Method A:
Transfer Water with a Straw

Method B:
Balloon Cups
The balloon was pushed inside the cup.

The balloon is elastic so it pushed air out of the cup.  The cup has low pressure and the air outside the cup is higher.  
Method C:
The Heavy Newspaper
The flask sticks to the palm of your hand

Outside the flask is higher pressure so it pushes your hand into the flask.
Higher temperature in the flask caused lower pressure.  
Method D:
The Magic Beaker
Method E:
The Live Balloon
Method F:
The Candle Under the Jar
The candle under the smallest jar went out in 5.0s.  medium 15s and the big jar 35s

The smallest went out first because there’s less air which means there’s less oxygen so the candle burns all the oxygen first.  

Science Fair
           We will be having our Science Fair on the February 27th. To see more information (Schedule, Rubric, and Possible Questions) check this document. If you want to propose a group, fill out this form. If you want to propose a research question, fill out this form.

2 comments:

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  2. Good blog post Ji Won. One of the things you could've improved on is showing the colors of the dangerous amounts of carbon monoxide. You could've took more pictures for us to compare the safe and dangerous amounts of carbon monoxide. We couldn't see method C and D's pictures. I really liked the photos. They were all very clear and easy to see. You could've explained the conclusions from the experiments. For example, you could've explained why the water stayed in the straw even if there was a hole at the bottom. Was it because of air pressure?

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