Small clean empty 20 oz plastic bottle
Using the funnel, add 3 teaspoons of baking soda to the balloon.
Fill the bottle 1/3 full with vinegar
Carefully fit the balloon over the bottle opening without dropping in the baking soda
Hold up the balloon and let the baking soda drop into the vinegar
Watch as the baking soda mixes with the vinegar to make carbon dioxide gas and blow up the balloon
The vinegar (a liquid) mixes with the baking soda (a solid) to create a chemical reaction that produces carbon dioxide gas. The gas then blows up the balloon.