A cook removes an aluminium baking tray from an oven and leaves it to cool. The tray has a mass of 0.60 kg and its temperature falls from 170 ∘C170\ ^\circ\text{C}170 ∘C to 40 ∘C40\ ^\circ\text{C}40 ∘C. The tray remains solid.
| Material | Specific heat capacity in J/kg ∘C\text{J/kg}\,{}^\circ\text{C}J/kg∘C |
|---|---|
| aluminium | 900 |
| copper | 390 |
Calculate the temperature decrease of the aluminium tray.
Calculate the energy released by the aluminium tray during this cooling.
Use the equation
ΔQ=m×c×Δθ\Delta Q=m\times c\times\Delta\thetaΔQ=m×c×Δθ
A copper tray releases 46 800 J46\,800\ \text{J}46800 J as its temperature decreases by 100 ∘C100\ ^\circ\text{C}100 ∘C.
Calculate the mass of the copper tray.
Use the equation
m=ΔQc×Δθm=\dfrac{\Delta Q}{c\times\Delta\theta}m=c×ΔθΔQ
Explain, in terms of the particles, why the temperature of the aluminium tray decreases as it cools.
110 exam-style questions on Edexcel GCSE Physics 14.2 Specific heat capacity and latent heat, covering 14.2.1 Heating, temperature and changes of state, 14.2.2 Specific heat capacity and specific latent heat, 14.2.3 Specific heat capacity calculation, 14.2.4 Specific latent heat calculation, and 14.2.5 Reducing energy transfer through thermal insulation. Each one has a worked solution and a mark scheme showing where the marks go.