Measuring heat energy
3 marks · EasyA block of aluminium weighs 0.5 kg. Its specific heat capacity is 900 J/kg°C.
Calculate the energy required to heat the block from 15 °C to 25 °C.
Explain what would happen to the particles in the aluminium block as its temperature increases.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
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(a) 4500 J
(b) The particles vibrate more quickly as temperature rises, meaning their kinetic energy increases. · must show vibrate more/kinetic energy increases
Common mistakes: Forgetting temperature change is 10 °C; using mass instead of ΔT
Show mark scheme and worked solution
Marking points
M1 (a) · 1 mark · Correct substitution into ΔQ = m × c × ΔT. (follow-through)
A1 (a) · 1 mark · Correct final answer: 4500 J. (follow-through)
B1 (b) · 1 mark · Describes increase in particle vibration or kinetic energy as temperature increases.
Worked solution
a) ΔT = 25 °C – 15 °C = 10 °C
b) As the temperature increases, the particles vibrate more quickly, so their kinetic energy increases.