environment or the glass. (specific heat capacity of ice 2 100 J kg1 K1; specific heat capacity of water 4 180 J kg1 K1; specific latent heat of fusion of ice 3.3 105 J kg1)
(i) How much energy is required to convert 12 g of ice at 10 C to water at 15 C? (ii) How much water was in the glass originally?
‘SECTION B’
HALF QUESTION Typical of Question 12 in Leaving Cert. Exam
Q7 Answer both of the following parts (a) and (b). (a) Explain how a substance is heated by convection.
Describe an experiment to demonstrate convection in a liquid. Explain, with the aid of a labelled diagram, how water is heated in a solar heating panel. (b) Define specific heat capacity.
In an electric storage heater, bricks with a high specific heat capacity are heated overnight by passing an electric current through a heating coil in the bricks.The bricks are surrounded by insulation.
(i) Why do the bricks have high specific heat capacity? (ii) Give one advantage and one disadvantage of using storage heaters.
(iii) What are the two ways heat travels from the storage heaters to heat the room it’s in. Describe an experiment to demonstrate how different solids conduct heat at different rates.
