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In this introductory activity and demonstration, learners are introduced to the concept that different substances react chemically in characteristic ways.

Learners investigate signs of a chemical reaction when they mix vinegar and baking soda. In addition to a gas being produced, learners also notice the temperature decreases.

A group of learners simulates the spread of disease by trading slips of paper, one set of which has been treated with a baking soda solution.