A-LevelPhysicsThermodynamics9702/42 · May/June 2020 · Q36 Marks
By reference to the first law of thermodynamics, state and explain the change, if any, in the internal energy of:
- (a)a lump of solid lead as it melts at constant temperature[3]
- (b)some gas in a toy balloon when the balloon bursts and no thermal energy enters or leaves the gas.[3]
Mark scheme
Marking points from the official mark scheme (May/June 2020). The mark or mark type is shown in brackets.
- [1] (little/no volume change so) little/no external work done
- [1] thermal energy supplied to provide latent heat
- [1] internal energy increases
- [1] (rapid) increase in volume
- [1] gas does work against the atmosphere
- [1] internal energy decreases
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