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    American Chemical Society
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    In this activity on page 7 of the PDF, learners use iodine to identify foods that contain starch. Compare the starch content of a ripe banana, an overripe banana, milk, and flour mixed with water....

    $1 - $5 per student Ages 6 - 14 10 to 30 minutes
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    NASA
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    In this activity, learners test the rate of ripening fruit and vegetables and use a chemical to inhibit the ripening process. After the experiment, learners measure the exposed surface area of the...

    $10 - $20 per group Ages 8 - 14 1 to 2 hours