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

In this activity, learners mix up a bubbly brew and examine density. Learners explore how they can make different materials fall and rise in water using oil, water, and salt.

In this simple activity, learners see the production of a gas, which visibly fills up a balloon placed over the neck of a bottle.

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