Balloon Baggies
Materials:  zip-lock bags
                   baking soda
                   vinegar
                   tissues
Procedure:  1.  Tear a small square (approx. 3"by3")
                          from the tissue.
                    2.  Place one teaspoon of baking soda on
                          the tissue square, and fold over the                                   edges.
                    3.  Pour one-half cup of vinegar into the
                         zip-lock bag.
                    4.  Place the square of tissu?e paper into
                         the zip-lock bag, and
QUICKLY zip
                         the bag shut.

                    
Now watch what happens!
Explanation:  The vinegar and baking soda combined in a chemical reaction to produce carbon dioxide. The carbon dioxide gas filled the bag, causing it to expand, much like a balloon.
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