Question

Which laboratory activity involves a chemical change?

leaving a copper penny in vinegar until it turns green
boiling saltwater for several minutes until only solid salt remains
extracting iron filings from a sand mixture using a magnet
crushing a rock with a hammer to extract mineral deposits

Answer 1

leaving a copper penny in vinegar until it turns green

Step-by-step explanation:

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Answer 2

Answer: Leaving a copper penny in vinegar until it turns green

Explanation: The copper changes the color making it a chemical change due to the chemical reaction with vinegar or acetic acid.