Standard Science Primary 4 Matter

Which of the following processes involves a substance losing heat to the surroundings?

A Ice cubes melting into water
B Water boiling in a kettle
C Puddles of water drying up
D Water vapour forming droplets on a cold mirror
Show Worked Solution

Worked Solution

Step 1: Identify the change of state in each option. Step [2-9]: Melting, boiling, and evaporation involve gaining heat. Step [2-9]: Formation of droplets is condensation (gas to liquid), which involves losing heat.

Correct answer: Water vapour forming droplets on a cold mirror

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