1.3 explain the changes in arrangement, movement and energy of particles during these interconversions.

I basically explained this in 1.2 but I'll go over it again:

SOLIDS:

- Particles are packed together ~ Don't move ~ Small vibrations

LIQUIDS:

- Free to move ~ Move to fit container ~ Constantly small movements

GASES:

- Free to spread far apart ~ Moves freely and always fits container ~ Constantly moving with random motion