Standard Science Primary 4 Energy

Luke heated a beaker of water until it boiled. He continued heating it for another 5 minutes. What was the temperature of the water during those 5 minutes?

A It continued to increase.
B It decreased slightly.
C It fluctuated between 90°C and 100°C.
D It stayed at 100°C.
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Worked Solution

Step 1: Boiling point of pure water is 100°C. Step 2: During a change of state (boiling), temperature remains constant. Step 3: The heat energy is used to break bonds for evaporation.

Correct answer: It stayed at 100°C.

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