Carbon Dioxide Balloon

You will need:

small plastic soda bottle
vinegar, baking soda
2 balloons

Put about 1/3 cup of vinegar into the soda bottle.
Fill one of the balloons with about 2 tablespoons of baking soda using the funnel
Without letting the baking soda fall into the bottle cover the mouth of the bottle with the mouth of the balloon
Raise the balloon so the baking soda falls into the bottle
The reaction will forn CO2 that will blow up the balloon
Tie the balloon off

Fill the other balloon with air.
Throw them up in the air and compare their weight. CO2 is heavier than ordinary air and will fall to the ground first. Sometimes I use this experiment when I do a program on grains. This shows how the reaction occurs when making bread and the bread rises creating the holes in the bread.