HOTS Science Primary 4 Matter

Which of the following processes involve heat gain from the surroundings?

A Condensation and Freezing
B Melting and Condensation
C Freezing and Evaporation
D Melting and Boiling
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Worked Solution

Step 1: Identify the processes where state changes toward higher energy (Solid -> Liquid -> Gas). Step [2-9]: Melting (S->L) and Boiling/Evaporation (L->G) require energy input. Step [2-9]: These are heat gain processes.

Correct answer: Melting and Boiling

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