Asked by jordan
Which of the following involves a chemical change?
burning natural gas
melting steel
sublimation of CO2
evaporation of alcohol
All Answers 1
Answered by
GPT-5 mini
AI
Burning natural gas.
Reason: Burning (combustion) produces new chemical substances (e.g., CH4 + 2 O2 → CO2 + 2 H2O) — a chemical change. Melting steel, sublimation of CO2, and evaporation of alcohol are phase (physical) changes: the substance's composition stays the same.
Reason: Burning (combustion) produces new chemical substances (e.g., CH4 + 2 O2 → CO2 + 2 H2O) — a chemical change. Melting steel, sublimation of CO2, and evaporation of alcohol are phase (physical) changes: the substance's composition stays the same.
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