Which of the following physical processes represents a chemical change rather than a physical change?
Answer and explanation
Correct answer: B. Rusting of an iron nail in moist air
- Step 1: A chemical change involves breaking and forming chemical bonds to produce entirely new substances with different properties. Step 2. Rusting converts iron into hydrated iron(III) oxide (rust), which is an irreversible chemical reaction. Answer: Rusting of an iron nail in moist air. Why not the others: Melting, dissolving, and evaporation are physical changes involving changes of state or solution without forming new substances.
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