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In this chemistry activity (page 3 of the PDF), learners will observe a chemical change, specifically what happens to iodine when it is applied to ripe and unripe apples.

Over $20 per group Ages 8 - 14 10 to 30 minutes
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In this activity, learners conduct tests for proteins, glucose, and starch.

Over $20 per group Ages 11 - 18 1 to 2 hours