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    Oregon Museum of Science and Industry
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    This display shows slow chemical reactions in colorful crystal formations known as Liesegang Rings. These reactions are similar to those forming the rings in agates. This activity is recommended...

    $5 - $10 per student Ages 14 - adult 1 to 4 weeks
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    Oregon Museum of Science and Industry
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    In this activity (on pages 19-24 of PDF), learners soak chicken bones or eggshells in vinegar for several days. Learners observe what happens to the material as the acid dissolves the calcium that...

    1 cent - $1 per student Ages 8 - 14 1 to 4 weeks
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    Integrated Teaching and Learning Program, College of Engineering, University of Colorado at Boulder
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    As a model of acid rain, learners water plants with three different solutions: water only, vinegar only, vinegar-water mixture. After a period of days or weeks, learners see the effect acid has on...

    $10 - $20 per group Ages 8 - 14 1 to 4 weeks
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    New Jersey Department of Education
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    In this fun and in depth hands-on experiment, learners test various liquid samples (distilled water, lemon juice, vinegar, and baking soda mixed with water) to determine their pH levels and...

    $5 - $10 per group Ages 11 - 18 1 to 4 weeks
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    Pratt School of Engineering, Duke University
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    Learners design their own experiment to determine conditions that either help or hinder the decomposition of carrots by soil microbes. They place carrots in plastic bags filled with soil (with or...

    $10 - $20 per group Ages 11 - 14 1 to 4 weeks