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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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    Learners create hard water by mixing Epsom salt and water. Then they compare what happens when soap solution is mixed with hard water and regular water. The precipitate that forms from soap and...

    $1 - $5 per group Ages 6 - 14 30 to 45 minutes
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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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    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