Apologia Physical Science Ex. 3.2

After the successful crushing of the can in experiment 3.1, the kids were ready for another exciting lab.  Experiment 3.2 is Seeing the Effect of Changing Temperature.  Required materials are:  ice, water, plastic bottle, balloon, bowl, and goggles. 

Things I brought, due to the fact I do not have access to a stove or sink:  electric teapot, two large bowls, and a cooler of ice.

Here is a photo of one of my students holding the bottle down into the cold water.  The main thing here is to get the bottle very cold and not allow any water in the bottle.  You want to sllloooowwww down the molecules.

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She had to hold that bottle in there for five minutes, while everyone else got to listen to my dribble (so they thought) about atoms.  I got a lot of blank faces when I drew an atom on the board.  LOL

Once the  bottle was cold, the young man below put the balloon over the opening and made sure it had a good seal. 

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There are a couple of things to note about this photo.  Remember this was done right  after the excitement of crushing the can.  Notice, the girl has not moved, expect to turn the bottle upright.  The young man is a little too far from the bottle.  Wonder what they are thinking.  Will it explode?

Once the balloon is on the bottle, it is placed in a bowl of hot water.   I used the electric teapot to make the hot water.

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The balloon inflates, but as you can see the young man thought it was going to explode.  LOL   This is all it did, which means the experiment worked very well for us this time. 

Out of seven students only one (the young woman in the first photo) was able to explain why the balloon inflated.   The molecules were slowed down in the cold water, then heated up quickly in the hot water.  The air expanded in the bottle inflating the balloon.  The molecules moved faster and faster, bouncing off the balloon, making the sides of the balloon push out (inflating it).   She won a candy bar.  :)

For more posts on what we are doing, click on Physical Science button at the top of the Applie blog.  :)

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12 responses to “Apologia Physical Science Ex. 3.2

  1. Very good job to the young lady (who by the way almost looks like she could be the older version of one of your girls – S? the blond)

    It’s funny that they thought you would do 2 similar experiments that would explode so close together :lol:

  2. < ![CDATA[Very good job to the young lady (who by the way almost looks like she could be the older version of one of your girls - S? the blond)

    It's funny that they thought you would do 2 similar experiments that would explode so close together :lol:]]>

  3. That was very well done…..I would have liked to see the exploding one…..is that in here?

    Yes you two students look a little hesitant there….LOL

  4. < ![CDATA[That was very well done.....I would have liked to see the exploding one.....is that in here?

    Yes you two students look a little hesitant there....LOL]]>

  5. Cool! We did that experiment at our house once, and neither of the kids could tell me why the balloon inflated. Maybe if I had offered them candy they would have thought harder about it. LOL

    Elaine, I thought the young lady looked like she could belong to Beth S.

  6. < ![CDATA[Cool! We did that experiment at our house once, and neither of the kids could tell me why the balloon inflated. Maybe if I had offered them candy they would have thought harder about it. LOL

    Elaine, I thought the young lady looked like she could belong to Beth S.]]>

  7. LOL Your students look like they are enjoying the class and the prospect of explosions. John liked that experiment. He did it forward and backwards.

  8. < ![CDATA[LOL Your students look like they are enjoying the class and the prospect of explosions. John liked that experiment. He did it forward and backwards.]]>

  9. Donna, that is a great idea. I hadn’t thought about doing it backwards. :)

  10. < ![CDATA[Donna, that is a great idea. I hadn’t thought about doing it backwards. :) ]]>

  11. We did this one today, and did it backwards too. =)
    Thanks for all the stuff you’ve posted on here, Michelle! Helps me out a lot. ;D

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