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    PhET
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    In this online interactive simulation, learners will add different salts to water and then watch the salts dissolve and achieve a dynamic equilibrium with solid precipitate. Learners will also...

    free Ages 8 - adult 10 to 30 minutes
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    Integrated Teaching and Learning Program, College of Engineering, University of Colorado at Boulder
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    Learners investigate the concept of humidity by using a dry and wet sponge as a model. They determine a model for 100% humidity, a sponge saturated with water. From this, they understand that...

    1 cent - $1 per group Ages 8 - 14 30 to 45 minutes
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    COSI
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    This is a chemistry lab activity about solutions (page 6 of the PDF). Students make a limewater testing solution for carbon dioxide and explore the concepts of solubility and precipitates. The...

    $10 - $20 per group Ages 6 - 14 4 to 24 hours
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    IEEE
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    This lesson focuses on surface area and how the shape of sugar crystals may differ as they are grown from sugars of different coarseness. Learners explore surface area, nanostructures, and work in...

    $1 - $5 per group Ages 8 - 14 1 to 7 days
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    Twin Cities Public Television
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    In this activity about saturation (page 1 of PDF under SciGirls Activity: Sand Dunes), learners will build a series of sand castle towers using a 16 oz cup. Learners begin with completely dry sand...

    $5 - $10 per group Ages 8 - 14 45 to 60 minutes