1.2 understand the interconversions between the three states of matter in terms of: • the names of the interconversions • how they are achieved • the changes in arrangement, movement and energy of the particles.

Solid to Liquid- (melting) 

• The particles gain kinetic energy and vibrate faster.
• This allows the particles to overcome the forces of attraction that hold them in place in the solid state. 
• The regular pattern is broken down and the particles are free to 'slide over' each other.

Liquid to Solid- (freezing)

• The particles lose kinetic energy which then allows the forces of attraction between the particles to hold them together.
• The particles are arranged in a regular pattern and cannot slide over each other.
  

Liquid to Gas- (boiling)

• The particles gain kinetic energy and move further apart. 
• The forces of attraction between the particles are completely destroyed and are then able to escape from the liquid.

Gas to Liquid- (condensing) 

• The particles lose kinetic energy, this allows the forces of attraction to bring the particles closer together. 
• The particles then cluster together to form a liquid.

Solid to Gas- (sublimation)

• The particles gain kinetic energy and vibrate faster. 
• Soon the forces of attraction between particles are completely broken and they are able to escape from the solid.