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

Learners smell balloons filled with different scents to guess what's inside. From this, they infer the presence and motion of scented molecules.

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

Learners mix a solution of luminol with hydrogen peroxide to produce a reaction that gives off blue light.

Through this nutrition activity (page 5 of the PDF), learners will understand—and probably be surprised by—how big serving sizes of various foods should be.

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

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

In this chemistry activity, learners prepare two petri dishes, one filled with water and one filled with milk.

In this experiment, learners use JOY liquid detergent and glycerin to make the largest bubble they can that lasts 15 seconds.

In this activity, learners separate a mixture of pebbles, salt crystals, and wood pieces. They add water and pour the mixture through a strainer.