Question

In substance A, the forces of attraction between particles are very weak and the distance of separation between the particles is large. Predict the following properties of the substance
(a) Shape and size
(b) Diffusion
(c) Physical state
(d) Compressibility

Answer 1

The substance is more like a gas.
The substance may not have a proper size and proper shape. 
Diffusion - the particles of the substance could diffuse - spread the container they are in.

physical state - gas
compressibility  - as the gap between the particles is large, the substance is compressible easily.