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A Level Specific Heat Capacity Questions

 

Q5. A tray containing 0.20 kg of water at 20 °C is placed in a freezer.

(a) The temperature of the water drops to 0 °C in 10 minutes.

(specific heat capacity of water = 4200 J kg - 1 K – 1)

Calculate

(i) the energy lost by the water as it cools to 0 °C,

(ii) the average rate at which the water is losing energy, in J s–1.

(3 marks)

(b)

(i) Estimate the time taken for the water at 0 °C to turn completely into ice.

(specific latent heat of fusion of water = 3.3 x 1 0 5 J kg – 1)

(ii) State any assumptions you make.

(3 marks)

(Total 6 marks)