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In this activity, learners discover what happens when they crush wintergreen-flavored candies in a very dark room.

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.

Learners observe two joined glass tubes containing a conductive salt solution. Electrodes are passing an electric current through the water.