0.020 kg of steam at 100 ∘C100\ {}^\circ\text{C}100 ∘C condenses on a cold window. The water formed then cools to 40 ∘C40\ {}^\circ\text{C}40 ∘C.
Table
| Quantity | Value |
|---|---|
| Specific latent heat of vaporisation of water | 2.26 × 106 J/kg |
| Specific heat capacity of water | 4200 J/kg ∘C4200\ \text{J/kg}\ {}^\circ\text{C}4200 J/kg ∘C |
How much energy is transferred from the steam to the window?
4.52×104 J4.52 \times 10^{4}\ \text{J}4.52×104 J
4.86×104 J4.86 \times 10^{4}\ \text{J}4.86×104 J
5.02×104 J5.02 \times 10^{4}\ \text{J}5.02×104 J
5.36×104 J5.36 \times 10^{4}\ \text{J}5.36×104 J
44 exam-style questions on OCR GCSE Physics 1.2 Changes of state, covering 1.2.1 Conservation of mass during changes of state, 1.2.2 Physical and chemical changes, 1.2.3 Heating, temperature and changes of state, 1.2.4 Specific heat capacity and specific latent heat, 1.2.5 Internal energy and temperature change, and 1.2.6 Energy transfer during a change of state. Each one has a worked solution and a mark scheme showing where the marks go.