Standard Science Primary 4 Matter

A beaker of water was heated until it boiled. It was kept boiling for 10 minutes. Which of the following statements about the water is true during these 10 minutes?

A The water loses heat to the surroundings.
B The water gains heat and its temperature remains at 100°C.
C The temperature of the water continues to rise.
D The water is changing from a gas to a liquid.
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Worked Solution

Step 1: Boiling is a process where a liquid changes to a gas at its boiling point (100°C for pure water). Step [2-9]: During a change of state, heat is gained to break the bonds between particles, so the temperature remains constant. Step [2-9]: The water continues to gain heat from the burner while staying at 100°C.

Correct answer: The water gains heat and its temperature remains at 100°C.

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