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Water drips into a sponge block in a device that cools a room. Air flows through the wet sponge block and water evaporates.
The device in Fig. 5.1 cools by evaporation. Explain in terms of particle motion why the temperature of water remaining in the sponge block decreases.
Water drips into a sponge block in a device that cools a room. Air flows through the wet sponge block and water evaporates.
Fig. 5.1
The device in Fig. 5.1 cools by evaporation. Explain in terms of particle motion why the temperature of water remaining in the sponge block decreases.
Answer guidance
Explain Give reasons, not just what happens. Each distinct reason is usually worth a mark.
[2 marks]
(a)(ii)
Using Fig. 5.1, explain why energy is needed when the water evaporates.
Answer guidance
Using You must use the thing it names. An answer that reaches the right value another way may not score.
[1 mark]
(b)
State two ways in which evaporation in the device of Fig. 5.1 differs from boiling.
Answer guidance
State A short answer. No explanation is needed, and adding one cannot earn extra marks.
[2 marks]
5054/22/O/N/23Cambridge O Level Physics 5054 · Oct/Nov 2023 · Paper 2 variant 2 · Question 5