States of Matter 1.2 & 1.3 understand how the interconversions of solids, liquids and gases are achieved and recall the names used for these interconversions

Solid to Liquid- (melting) 

The particles gain kinetic energy and vibrate faster and faster. This allows the particles to overcome forces off attraction that holds them in place in the state of a solid. 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 and this allows the forces of attraction between the particles to hold them together. The particles arrange themselves into a regular pattern and cannot slide over each other.

Liquid to Gas- (boiling)

The particles gain kinetic energy and move further apart. Eventually 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 and this allows the forces of attraction to bring the particles closer together. The particles eventually clump together to form a liquid.

Solid to Gas- (sublimation)

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

States of Matter 1.1 understand the arrangement, movement and energy of the particles in each of the three states of matter: solid, liquid and gas

Solids- 

As you can see, the spacing between particles is  extremely small and the are close together and touching one another. Solids have an regular and repeating pattern and vibrate in their fixed positions but do not move apart. They have strong forces between the particles, which is stronger than liquids and gases.


Liquids-

Liquids also have particles that are close together and touching each other, but their arrangement of particles is irregular. They move around and slide past each other. The forces between particles is not as strong as solids.

Gases

The is a large spacing between the gas particles and the arrangement is irregular. The particles move freely and constantly collide with each other. There are no forces between particles