Standard Science Primary 4 Energy

When water is heated until it boils, what happens to its temperature if heating continues?

A It drops slightly as steam escapes.
B It fluctuates between 90°C and 100°C.
C It continues to rise above 100°C.
D It stays at 100°C until all water becomes steam.
Show Worked Solution

Worked Solution

Step 1: Boiling is a change of state (liquid to gas). Step 2: During a change of state, the temperature of a substance remains constant. Step 3: For pure water, this is 100°C.

Correct answer: It stays at 100°C until all water becomes steam.

Want more questions like this? Superholic Lab has 10,000+ MOE-aligned questions with full worked solutions.

Start Free Trial — 7 Days Free