Physics · May / June 2020 · Paper 41 · Question 4
0625
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Water has a specific heat capacity of 4200 J / (kg °C) and a boiling point of 100 °C.
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4(a)[1]
temperature at which liquid turns into gas
4(b)(i)[2]
(E =) mc∆T OR 0.30 × 4200 × (100 – 95)
6300 J
4(b)(ii)[2]
(C =) E / ∆T OR 6300 / 84
75 J / °C
4(b)(iii)[3]
molecules do work against attractive force as they evaporate
more energetic molecules more likely to escape
average energy of remaining molecules decreases
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