Standard Science Primary 5 Cycles

Look at the changes of state for water shown in the diagram. Which processes represent heat gain?

A Process A and Process B
B Process B and Process C
C Process C and Process D
D Process A and Process C
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Worked Solution

Step 1: Identify Process A (Ice to Water) as melting. Melting requires heat gain. Step 2: Identify Process B (Water to Steam) as boiling/evaporation. This requires heat gain. Step 3: Process C (Steam to Water) is condensation (heat loss). Process D is freezing (heat loss). Step 4: Processes A and B require heat gain.

Correct answer: Process A and Process B

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