Standard Science Primary 4 Energy

Siti heated a beaker of tap water until it reached a rolling boil. If she continues to heat the water for another 5 minutes, what will the temperature be?

A It will decrease to 90°C.
B It will fluctuate between 95°C and 105°C.
C It will remain at 100°C.
D It will increase to 110°C.
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Worked Solution

Step 1: Identify the state (boiling). Step [2-9]: Recall that the boiling point of pure water is 100°C. Step [2-9]: During a change of state (liquid to gas), the temperature remains constant even if heating continues.

Correct answer: It will remain at 100°C.

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