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

As matter is heated, the particles gain more kinetic energy and vibrate more (solids) or move increasingly rapidly (liquids and gases).  If enough heat is supplied, a change of state is seen as this energy overcomes forces of attraction between the particles and they can move further apart.  The reverse is true when matter is cooled and particles lose kinetic energy.