O-LevelPhysicsThermal Physics5054/22 · Oct/Nov 2014 · Q65 Marks
Fig. 6.1 shows a runner in a long distance race. He tips water over himself to keep cool. [Figure 6.1]
- (a)State what happens to the molecules of a gas as its temperature increases.[1]
- (b)(i)Explain, in terms of molecules, how the evaporation of water keeps the runner cool.[3]
- (b)(ii)At one point in the race, a strong breeze blows past the runner and the water evaporates more quickly. Suggest one reason why the water evaporates more quickly in the breeze.[1]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2014). The mark or mark type is shown in brackets.
- [1] (the molecules) move faster or have more kinetic energy or accelerate ignore vibrate faster
- [1] faster/energetic molecules escape
- [1] average speed decreases or slower molecules remain
- [1] temperature depends on average KE or heat taken from runner OR liquid becomes gas/vapour latent heat needed or bonds broken heat taken from runner
- [1] water vapour blown away or surrounding air less humid
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