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14.2 Specific heat capacity and latent heat

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Question 25

A heater supplies 1.0 × 105 J of energy to a flask containing 0.040 kg of a liquid at its boiling point. The heater is switched off at the moment the last of the liquid changes into gas. The specific latent heat of vaporisation of the liquid is 1.5 × 106 J/kg.

How much of the energy supplied by the heater is not transferred to the liquid? Use Q=mLQ=mLQ=mL.

[1]
A

9.4×104 J9.4\times10^4\ \mathrm{J}9.4×104 J

B

6.0×104 J6.0\times10^4\ \mathrm{J}6.0×104 J

C

4.0×104 J4.0\times10^4\ \mathrm{J}4.0×104 J

D

1.6×105 J1.6\times10^5\ \mathrm{J}1.6×105 J

Markscheme

14.2 Specific heat capacity and latent heat Questions

  1. GCSE
  2. /Physics
  3. /14.2 Specific heat capacity and latent heat

110 exam-style questions on Edexcel GCSE Physics 14.2 Specific heat capacity and latent heat, covering 14.2.1 Heating, temperature and changes of state, 14.2.2 Specific heat capacity and specific latent heat, 14.2.3 Specific heat capacity calculation, 14.2.4 Specific latent heat calculation, and 14.2.5 Reducing energy transfer through thermal insulation. Each one has a worked solution and a mark scheme showing where the marks go.

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