Making pennies change colors using different substances is a great beginner way to study chemical reactions safely.
Creative Family Fun has a great rundown of how to do penny experiments, where you start with shiny pennies and use different chemicals on them to see what happens.
Of course you can do it the opposite way, too, and try to figure out what substances will make pennies shiny again.
She also has a great downloadable science experiment worksheet you can download and use for this experiment or any other to help your little scientists form their hypotheses and record their observations.
[Photo: Creative Family Fun.]
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