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

In this activity (page 6 of the PDF), learners will observe both a chemical and a physical change.

In this hands-on activity, learners use heat to shrink samples of polystyrene plastic (#6 recycle code). Learners compare the size and shape of the plastic pieces before and after shrinking.

Learners observe two model atmospheres -- one with normal atmospheric composition and another with an elevated concentration of carbon dioxide.