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Question

Which laboratory activity involves a chemical change? leaving a copper penny in vinegar until it turns greenboiling saltwater for several minutes until only solid salt remainsextracting iron filings from a sand mixture using a magnetcrushing a rock with a hammer to extract mineral deposits

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Eric

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Solution By Steps

Step 1: Identify the type of change in each activity

Leaving a copper penny in vinegar until it turns green: Chemical change (reaction between copper and vinegar).

Boiling saltwater for several minutes until only solid salt remains: Physical change (separation of components through evaporation).

Extracting iron filings from a sand mixture using a magnet: Physical change (separation using a magnetic force).

Crushing a rock with a hammer to extract mineral deposits: Physical change (mechanical alteration of the rock).

Step 2: Determine which activity involves a chemical change

The activity that involves a chemical change is “leaving a copper penny in vinegar until it turns green,” as it involves a reaction that alters the chemical composition of the copper.

Final Answer

The laboratory activity that involves a chemical change is leaving a copper penny in vinegar until it turns green.

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