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In this activity, learners build a simple qualitative conductivity tester with a battery, bulb and foil.

In this activity, learners measure the amount of carbon dioxide in a carbonated drink.

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 sublimate dry ice and then taste the carbon dioxide gas.

This activity shows you how to make amazing crystal spikes using Epsom salt and the sun.