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In this activity, learners explore acids and bases by preparing six solutions that combine vinegar and ammonia, ranging from acid (all vinegar) to base (all ammonia).

Learners will explore the scientific mystery behind a disappearing group of trees by examining data and attempting to explain the decline.

In this activity, learners add dilute bleach solution to water that has been dyed with yellow, blue, and green food color.

Learners test solutions of water, sugar, salt, and hydrochloric acid for electrical conductivity. They immerse leads from a lighting device (a battery pack connected to an LED) into each solution.

In two separate bags, learners mix water with Epsom salts and detergent.

Learners build a filter from old soda bottles and dirt. They create polluted water, and pour it through their filter to clean it.