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    In this chemistry challenge, learners systematically investigate which combination of four solutions produces a deep red color. The four solutions are iron(III) chloride, ammonium thiocyanate,...

    $10 - $20 per group Ages 11 - 18 10 to 30 minutes
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    In this chemistry challenge, learners combine acids and bases in a universal indicator to create five different colors. Using vinegar, washing soda, and Bogen universal indicator, the goal is to...

    Over $20 per group Ages 4 - 14 10 to 30 minutes
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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 chemistry challenge, learners identify an unknown white powder by comparing it with common household powders. Learners first explore what happens when baking soda, baking powder, and...

    Over $20 per group Ages 4 - 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
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    Learners are challenged to discover the relative densities of colored liquids to create a rainbow pattern in a test tube. Five different solutions—3 mixtures of ethyl alcohol, food color and water;...

    $5 - $10 per group Ages 4 - 14 10 to 30 minutes
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    In this chemistry challenge, learners identify which plants have the enzyme "catalase" that breaks hydrogen peroxide into water and oxygen. Multiple fruits and vegetables, both raw and...

    $5 - $10 per group Ages 4 - 14 10 to 30 minutes
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    Learners are challenged to create solutions that conduct electricity and make a buzzer buzz (or an LED light up). They are given water, salad oil, alcohol, and vinegar as liquids, salt and sugar as...

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