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Plaster of Paris

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In this activity (page 6 of the PDF), learners will observe both a chemical and a physical change.
Over $20 per group Ages 8 - 18 4 to 24 hours

Chromatography

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In this activity (page 3 of the PDF), learners will observe a physical change.
$1 - $5 per group Ages 6 - 14 10 to 30 minutes