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    In this challenge, learners have to figure out in what order to combine five solutions to change the color from clear, to yellow, to blue, and back to clear. The five chemicals are potassium iodide...

    Over $20 per group Ages 4 - 14 10 to 30 minutes
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    In this chemistry challenge, learners discover that many chemical reactions involve heat loss or gain. With this understanding, they try to find a combination of chemicals that could be used to...

    $10 - $20 per group Ages 4 - 14 10 to 30 minutes
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    In this chemistry challenge, learners work to figure out which of four juices are real, and which is just food coloring and sugar. Learners add vinegar (an acid) and washing soda solution (a base)...

    $5 - $10 per group Ages 8 - 14 10 to 30 minutes
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    In this challenge, learners figure out how to make a juice stain disappear. (Younger learners will definitely need assistance, and safety instructions are included in the PDF.) First they...

    $10 - $20 per group Ages 4 - 14 30 to 45 minutes