Measuring heat energy
2 marks · EasyCalculate the increase in thermal energy (in joules) needed to raise the temperature of 200 g of water by 5 °C. (The specific heat capacity of water is 4200 J/kg°C)
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4200 J/kg°C × 0.2 kg × 5°C = 4200 J (±1)
Common mistakes: Not converting grams to kilograms, using wrong formula.
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Marking points
M1 · 1 mark · Substitutes correct values into ΔQ = m × c × ΔT and converts mass to kg (0.2 kg).
A1 · 1 mark · Correct final answer: 4200 J (accept 4200 or 4,200). (follow-through)
Worked solution
Mass = 200 g = 0.2 kg