Apologia Physical Science, Module 2 - Air

•What we did 2010
•Videos for this module

Air takes up space!  I mean, it really does!
Just look at these pics of kids trying to blow up a balloon inside a 2-liter bottle.
Since the opening of the bottle is sealed with the balloon, and the bottle is full of air, there is no room for the balloon to expand.

But Look!  What is this???
Why can JohnDavid blow up his balloon???





We all had a good laugh over that one!  =)



In Experiment 2.2, Oxygen and Fire, I also added Carbon Dioxide.  I wanted them to remember that oxygen feeds fire, and that the heavier carbon dioxide displaces the oxygen-containing air around the candle, suffocating the fire.
(Here is a neat way to pour CO2 onto a lit candle and extinguish it!  With a bit more explanation about displacing oxygen.)

Hydrogen peroxide and yeast produce oxygen.
Vinegar and baking soda produce carbon dioxide.

But first, an overflow!  Woopsie! =D



Okay, here we go...
CO2 in the yellow balloon; oxygen in the white balloon.



They always have fun when we make a mess!

sMiLeS,