# States of Matter

## The three states of matter-solid, liquid and gas

• Materials come in three different forms-solid, liquid and gas.

• Which state something is at a certain temperature depends on how strong the forces of attraction are between the particles of the material

• How strong the forces are depends on three things

• The material(the structure of the substance, and the type of bonds holding the particles together)

• The temperature

• The pressure

Particles theory:

• Solids

• In solids, there are strong forces of attraction between particles, which holds them close together in fixed positions to form a very regular lattice arrangement

• The particles don’t move from their positions, so all solids keep a definite shape and volume and don’t flow like liquids

• The particles vibrate about their positions, the hotter the solid becomes, the more they vibrate(causing solids to expand slightly when heated)

• Liquids

• In liquids, there’s a weak force of attraction between the particles

• They’re randomly arranged and free to move

• Definite volume but don’t keep a definite shape

• Constantly moving with a random motion, hotter the liquid faster they move

• Gases

• In gases, the force of attraction is very weak

• Free to move and far apart

• Constantly moving with a random motion

## State symbols tell you the state of a substance in an equation

• Solid-s

• Liquid-l

• Gas-g

• Aqueous(means dissolved in water)-aq