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In this activity, learners discover that atoms and ions of different metals will change places.

1 cent - $1 per group Ages 11 - adult Under 5 minutes
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In this chemistry activity (on page 2 of the PDF), learners corrode a penny in a cup with vinegar, salt water, and a source of iron (nails, paper clips, or twist ties).

1 cent - $1 per student Ages 6 - 14 1 to 7 days