A particular type of cooking oil is a liquid at room temperature.

1. (a)(i)why the density of the oil is much greater than that of a gas,[1]
2. (a)(ii)why the oil cannot be compressed.[1]
3. (b)(i)The density of the oil is 0.85 g/cm³. Calculate the volume of oil in the pan.[2]
4. (b)(ii)The pan is placed on an electric hotplate, as shown in Fig. 10.1. [Figure 10.1]
5. (b)(ii) 1.Explain, in terms of molecules or free electrons, how thermal energy is conducted through the metal base of the pan.[3]
6. (b)(ii) 2.Explain how thermal energy spreads to all the oil in the pan.[3]
7. (b)(ii) 3.Suggest and explain a suitable material for the handle of the pan.[1]
8. (c)The specific heat capacity of the oil is 2.0 J/(g°C). The oil is heated from 20°C to its boiling point of 260 °C.
9. (c)(i)State what is meant by boiling point.[1]
10. (c)(ii)Calculate the thermal energy needed to heat the 680 g of oil to its boiling point.[2]
11. (c)(iii)Suggest one reason why the energy output from the hotplate, when heating the oil, is larger than the value calculated in (c)(ii).[1]

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