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This is a highly visual demonstration that illustrates both the effects of density and chemical reactions.

Visitors mix water and sodium bicarbonate (baking soda) in a large flask. They then add citric acid to the mixture and stopper the flask. The resulting reaction creates carbon dioxide gas.

Heat makes some materials expand, and it makes others shrink.

In this activity, learners build models of comets, using edible materials, to learn about comets' structure.