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In this online interactive simulation, learners will test the pH of liquids like coffee, spit, and soap to determine whether each is acidic, basic, or neutral.

In this activity, learners build a simple electrolysis device. Then learners use an indicating solution to visualize hydrogen and oxygen molecules in water.

In this activity, learners mix ingredients in a plastic bag, and then identify three characteristics of a chemical reaction: production of heat, color change, and production of a gas.

In this activity, learners perform an experiment to find out what determines a flower's color.

In this physics activity, learners will investigate the strength of egg shells.

In this Spanish-language chemistry activity, learners use simple materials to explore how fire extinguishers work to put out fires.