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In this chemistry challenge, learners identify an unknown white powder by comparing it with common household powders.

In this chemistry challenge, learners identify which plants have the enzyme "catalase" that breaks hydrogen peroxide into water and oxygen.

In this chemistry challenge, learners discover that many chemical reactions involve heat loss or gain.

Learners are challenged to discover the relative densities of colored liquids to create a rainbow pattern in a test tube.

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.

In this chemistry challenge, learners work to figure out which of four juices are real, and which is just food coloring and sugar.

In this chemistry challenge, learners systematically investigate which combination of four solutions produces a deep red color.

In this chemistry challenge, learners combine acids and bases in a universal indicator to create five different colors.

In this challenge, learners figure out how to make a juice stain disappear.

Learners are challenged to create solutions that conduct electricity and make a buzzer buzz (or an LED light up).