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In this chemistry activity (page 5 of the PDF), learners will see that chewing is more than just the crushing up of food; there is actually a chemical change going on at the same time.

1 cent - $1 per student Ages 6 - 11 5 to 10 minutes
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In this chemistry demonstration, learners will discover that phenolphthalein is an acid/base indicator. One learner will read a poem about four witches making a potion.

$1 - $5 per group Ages 11 - 18 5 to 10 minutes