Using the funnels, pour approximately 1 tablespoon of Baking soda into a #8 balloon. Pour approximately ¼ cup white vinegar into a small bottle ( 8 oz. size works well). 
Carefully pull the open end of the balloon over the bottle opening. Shake the baking soda out of the balloon into the bottle. Watch what happens!
Brownies can take bottles home but should empty them first.

Ask the brownies:
What happened when the baking soda mixed with the vinegar? 

Answer: a chemical reaction took place. Molecules were exchanged.

Explanation:

The Balloon Blower Upper Experiment is a demonstration of a simple chemical reaction involving an acid and a base. Sodium Bicarbonate (baking soda) and Acetic Acid (vinegar) are combined and result in water, carbon dioxide and a salt - CH3COONa. 

NaHCO3 + CH3COOH= CH3COONa +H2O +CO2

This is an example of how molecules are swapped in a chemical experiment.