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In this quick activity/demonstration about density, learners examine what happens when two cans of root beer--one diet and one regular--are placed in a large container of water.

In this activity, learners touch supercooled water drops with an ice crystal and trigger the water drops to freeze instantly.

In this chemistry activity (page 1 of the PDF), learners will observe a physical change.

Learners are challenged to create solutions that conduct electricity and make a buzzer buzz (or an LED light up).