The arrangement of the particles
3 marks · EasyDescribe the arrangement and movement of particles in each of the three states of matter.
Solid
Liquid
Gas
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(a) Particles are closely packed in a regular pattern and can only vibrate.
(b) Particles are close together but can move past each other randomly.
(c) Particles are far apart and move quickly in all directions.
Common mistakes: Mixing up descriptions between states
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Marking points
B1 (a) · 1 mark · Correctly describes particle arrangement and movement in a solid.
B2 (b) · 1 mark · Correctly describes particle arrangement and movement in a liquid.
B3 (c) · 1 mark · Correctly describes particle arrangement and movement in a gas.
Worked solution
a) In solids, particles are close together in a regular pattern and can only vibrate.
b) In liquids, particles are close together but move past each other randomly.
c) In gases, particles are far apart and move quickly in all directions.