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Ice is heated steadily and starts to melt. What happens to its temperature while the melting is going on?
AIt rises steadily
BIt falls steadily
CIt rises then falls
DIt stays constant
Answer & Solution
Correct answer: D. It stays constant
1. Heating usually raises the temperature of a substance.
2. While a substance melts or boils the temperature remains constant until the change of state is finished.
3. The energy going in is used to break the forces holding the particles in place.
4. Once every particle has changed state, the temperature starts to rise again.
_Source: Siyavula Physical Sciences Grade 10 (Everything Science, CC BY 4.0), Chapter 3: States of matter and the kinetic molecular theory_