by Richard Johnson
Using two tablespoons of vinegar, half teaspoon of baking soda, small cup for each child and very dirty pennies.
Each child will put a half teaspoon of baking soda and two tablespoons of vinegar into his small cup. He will then place a dirty penny into the cup and stir it with a stick. The child will watch the penny become clean.
Tell me what happened. Let's do it again with another penny.
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