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In this activity, learners test and compare the physical properties of thermoplastic polymers. Learners compare different plastics based on their color, degree of transparency, texture, and density.

$1 - $5 per group Ages 14 - adult 30 to 45 minutes
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Learners add drops of alginate solution to a solution of calcium chloride. The alginate does not mix with the calcium chloride, but forms soft gel beads.

per group Ages 8 - adult 5 to 10 minutes