Sunday, June 26, 2016

Science Quest #1 - blow up a balloon

Science Quest #1 - blow up a balloon

Can you blow up a balloon with yeast, sugar and water?

Try this!  

Get an empty bottle (a small coke bottle will work perfectly.)  keep the cap!
Fill 1/2 to 3/4 of the bottle with warm water.  (not boiling!)
Add in 2 teaspoons of FRESH active yeast (canned stuff will work)
Add in 2 teaspoons of sugar

Cap the bottle:  Shake vigorously for about 30 seconds.

Remove the cap.  Secure a balloon on the top of the bottle with a rubber band
Sit back and watch... wait...
The waiting's hard, I know!  

After a while, you will see bubbles forming.  A white foam will appear.  
The balloon will begin to look puffy.  Wait some more.
shake if necessary (make sure the balloon is on securely!)
Your waiting will pay off!  The balloon will stand up.  After some more time; the balloon will inflate!

Your challenge:  WHY does the balloon inflate?  Send in a photo of your balloon inflating, and explain WHY it does this!



# answer below #

The balloon inflates because when the yeast eats the sugar, Carbon Dioxide is released.
The molecules from a gas run fast and bounce off each other and spread out.
Because the balloon is on top of the bottle, the gases have no where else to go
except for into the balloon.  The more the yeast eats, the more gas is in the bottle,
and the more the balloon inflates.  

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