Standard Science Primary 4 Matter

Which statement correctly describes a difference between boiling and evaporation?

A Boiling occurs at all temperatures, while evaporation only at 100°C.
B Boiling is a slow process, while evaporation is fast.
C Boiling occurs throughout the liquid, while evaporation only at the surface.
D Boiling involves heat gain, while evaporation involves heat loss.
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Worked Solution

Step 1: Boiling happens at the boiling point and occurs throughout the bulk of the liquid (bubbles form). Step [2-9]: Evaporation happens at any temperature below the boiling point and only at the exposed surface.

Correct answer: Boiling occurs throughout the liquid, while evaporation only at the surface.

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