An aluminium saucepan fitted with a plastic handle is holding cold water, and Fig. 4.1 depicts the saucepan standing on a hotplate.
(a)[1]
State why aluminium is used for the pan while plastic is used for the handle.
(b(i))[1]
State what an increase in internal energy means in terms of molecules.
(b(ii))[3]
Explain, in terms of the atomic lattice and electrons, how thermal energy is transferred through the aluminium.
(b(iii))[3]
Explain, in terms of molecules, the effect of this thermal energy on the water.
(b(iv))[3]
Calculate the rate at which thermal energy is gained by the water.
Worked solution & mark scheme
This 11-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Aluminium is a good (heat) conductor, whereas plastic is a poor conductor / does not conduct heat” …