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In this chemistry challenge, learners discover that many chemical reactions involve heat loss or gain.

In this challenge, learners figure out how to make a juice stain disappear.

In this chemistry challenge, learners work to figure out which of four juices are real, and which is just food coloring and sugar.

In this challenge, learners have to figure out in what order to combine five solutions to change the color from clear, to yellow, to blue, and back to clear.