When a sample of a solid is heated, it melts into a liquid and then changes into a gas.
(a)[1]
Fig. 5.1 shows how the molecules are arranged in the solid.
In the space below, draw the arrangement of the molecules in the liquid.
(b)[3]
Complete the table by giving the motion of the molecules in the solid, liquid and gas.
(c)[2]
Suggest why a gas can fill a container whereas a solid keeps a fixed shape.
Worked solution & mark scheme
This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Irregular cluster of at least 8 molecules with at least one touching pair” …