Properties of the different states of matter
2 marks · NormalDescribe one similarity and one difference between the arrangement of particles in a liquid and a gas.
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Must show: one similarity; one difference
Common mistakes: Giving only movement rather than arrangement; Vague similarities
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Marking points
B1 · 1 mark · Provides a valid similarity (e.g. both have particles not in a fixed position).
B2 · 1 mark · Provides a valid difference (e.g. particles in a gas are far apart, in a liquid very close together).
Worked solution
Similarity: In both liquids and gases, the particles are not in fixed positions. Difference: In liquids, particles are very close together; in gases, they are far apart.