AQA GCSE Specific Heat Capacity Question

Question

8 marks

Answer all three parts. Show each stage of your calculations and include units.

1(a)

A pupil uses a

24 W

heater to heat a metal block. The heater is switched on for

300 s

. Calculate the energy transferred electrically by the heater. Use:

E = P t

[2 marks]

1(b)

The block has a mass of

0.50 kg

. Its temperature rises from

20.0^{\circ} C

31.0^{\circ} C

. Assume that all the energy calculated in part 1(a) is transferred to the block. Calculate the specific heat capacity of the metal. Use:

Δ E = m c Δ θ

[3 marks]

1(c)

The accepted value for the specific heat capacity of the metal is

900 J k g^{- 1}^{\circ} C^{- 1}

. The pupil's calculated value is higher than the accepted value. Explain one reason why the calculated value is too high and describe one improvement to the experiment.

[3 marks]

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