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Sugar/Salt Crystals
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In this chemistry activity (page 1 of the PDF), learners will observe a physical change.
Crystal Garden
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Visitors observe a tray holding a crystal-covered brick. The crystals were created by evaporation of a solution containing liquid bluing, ammonia, and salt.
A Closer Look at Crystals
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In this activity, learners compare different types of salt crystals under a magnifying glass.