1.1 Understand the arrangement, movement and energy of the particles in each of the three states of matter: Solid, Liquid and Gas

Particles in solids touch all touch and are in fixed positions.  They have very little energy and only vibrate in their fixed positions.
Particles in liquids touch as well, but they are not in fixed positions; they can slide over one another.  They have more energy than solid, which is why they move more.
Particles in gases do not touch but are spread out to fill the container in which they are held.  They have much more energy, and move randomly.