I liked the balloon test where we had a competition. We needed: vinegar, baking soda, a balloon and a flask. First we put the vinegar in the flask. Then we put the soda in the balloon. You then put the balloon on the flask and hang the balloon, so the soda can go into the vinegar. Then you shake it. The balloon inflates because of the gas carbon dioxide. It can't get out, so it blows up the balloon. I have got one question: What if we put more vinegar (up to the top) and then we put in about 6 tablespoons of baking soda.
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