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

In this "Sid the Science Kid" activity from Episode 108: My Ice Pops, learners observe reversible change while thinking about ways to make ice melt.

In this activity, learners sublimate dry ice and then taste the carbon dioxide gas.

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