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With little more than a flashlight, a straw, and a plastic lid, make an observatory so you can see the amazing colors in bubbles.

In this activity, learners explore why they can see colors in bubbles and why they change.

Learners use a commercially available toy to experiment with density. They fill a chamber in the toy submarine with baking powder and release it into a tank of water.

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