Lesson 1, Topic 1
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The three states of matter

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  • There are three states of matter – solid, liquid and gas

  • All matter is made up of particles. These particles can be atoms, molecules or ions

  • The arrangement of these particles determines the structure and property of each state

  • The state of matter 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 temperature

The pressure 


  • State symbols are often used in chemical equations 

  • (s) for solid

  • (l) for liquid

  • (g) for gas