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    Smithsonian Center for Education and Museum Studies
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    Learners will compare the growth rate and appearance of crystals forming on small rocks to those growing on miscellaneous objects. Learners will also investigate how temperature (warm vs. cool room...

    $1 - $5 per group Ages 8 - 14 1 to 7 days
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    American Chemical Society
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    In this activity, learners design a crushing test and discover that identifying and controlling the variables may be difficult. Although the crushing test will not give conclusive results, it is a...

    $1 - $5 per group Ages 8 - 14 10 to 30 minutes
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    American Chemical Society
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    Learners carefully look at four known household crystals. After observing and describing the crystals, learners are given an unknown crystal, which is chemically the same as one of the four known...

    $1 - $5 per group Ages 8 - 14 30 to 45 minutes
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    American Chemical Society
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    In this activity, learners apply a dissolving test to known crystals to identify the unknown. Since the unknown is chemically the same as one of the known crystals, it should dissolve similarly. By...

    $1 - $5 per group Ages 8 - 14 10 to 30 minutes