1.3 Explain the changes in arrangement, movement and energy of particles during these changes

As particles, for example in a liquid, are heated, they gain thermal energy, which is then transferred into kinetic energy.  This means that the liquid would move more and more rapidly until it reaches the point where the increased energy causes it to evapourate and become a gas.
The reverse is true: if a liquid is cooled, it looses energy, so it does not move about so much.  It stays in a fixed position and becomes a solid.