3 marksSpecific Latent Heat, l

CSEC Physics · 1992 · Paper 2 · Question 1(c)(i)

0.30 kg of ice at 0 °C is placed in a container. Calculate how much energy is required to completely melt the ice. (Specific latent heat of fusion of ice = 3.3 x 10^5 J kg^-1)

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1(a)Identify air, mercury, and aluminium as good or poor thermal and electrical conductors by writing 'GOOD' or 'POOR' in the spaces provided.[3 marks]
1(b)(i)Indicate on the diagram by means of an arrow, the direction of heat flow between the mixture and the ice/salt.[1 mark]
1(b)(ii)Explain why the inner container is made of a good thermal conductor while the outer container is made of a poor thermal conductor.[2 marks]
1(c)(ii)Calculate how much energy is required to raise the temperature of the melted ice to 15 °C. (Specific heat capacity of water = 4.2 x 10^3 J kg^-1 K^-1)[3 marks]
1(c)(iii)Some water at 30 °C is added to 0.30 kg of ice at 0 °C. The ice melts and the final temperature of all the water is 15 °C. Use your answers to (i) and (ii)…[4 marks]

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