A beaker holds water at room temperature. Fig. 4.1 depicts the beaker on a tripod above a Bunsen burner. The Bunsen burner is lit, and the water’s temperature starts to rise.
(a(i))[2]
Describe one way in which evaporation and boiling differ.
(a(ii))[1]
State and explain how the rate at which the water evaporates changes as its temperature increases.
(b(i))[1]
State what happens to the water’s temperature in the beaker.
(b(ii))[3]
Calculate the average rate at which energy is supplied to the water by heating.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Evaporation occurs at the surface; boiling happens throughout the liquid” …