Which change results in the formation of different substances?
1. Burning of propane
2. Melting of NaCl (s)
3. Deposition of CO2(g)
4. Solidification of water
Answer (2)
(1) burning of propane
(2) melting of NaCl (s)
(3) deposition of CO2(g)
(4) solidification of water
The change that results in the formation of different substances is the burning of propane, which is a chemical change that produces carbon dioxide and water. Other options, such as melting of NaCl, deposition of CO₂, and solidification of water, are all physical changes where the substances retain their original chemical identities. Thus, the answer is option 1.
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