O-LevelPhysicsThermal Physics5054/22 · May/June 2014 · Q36 Marks
Most substances expand when they are heated.
- (a)(i)State one example where expansion is useful.[1]
- (a)(ii)State one example where expansion causes a problem.[1]
- (b)Explain, using ideas about molecules, why solids expand when heated.[2]
- (c)1.The expansion of a solid is ..................................................... than the expansion of a liquid.[1]
- (c)2.The expansion of a gas is ..................................................... than the expansion of a liquid.[1]
Mark scheme
Marking points from the official mark scheme (May/June 2014). The mark or mark type is shown in brackets.
- [B1] (a) (i) any sensible example where expansion is useful
- [B1] (ii) any sensible example where expansion causes a problem
- [B1] (b) (molecules) move fast(er) or vibrate fast(er) or have more (kinetic/potential/internal) energy
- [B1] (molecules) move apart or distance between molecules increases or vibration has larger amplitude or vibration takes up more space or bonds stretch
- [B1] (c) slightly smaller
- [B1] much larger
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