1.1. Fig. 4.1 represents an atom.

Representing atoms by circles approximately the same size as in Fig. 4.1, sketch

(i) on Fig. 4.2, the arrangement of atoms in a crystalline solid,

[1]

(ii) on Fig. 4.3, the arrangement of atoms in a gas.

[1]

1.2. (i) Describe the motion of the atoms in a solid.

[1]

(ii) A sculptor makes a statue from a block of crystalline rock using a cutting tool. Explain why he must apply a large force to the tool to remove a small piece of rock.

[2]

1.3. A helium-filled balloon in the room of a house suddenly bursts. 

State and explain, in terms of atoms, what happens to the helium from the balloon after the balloon has burst.