The arrangement of the particles
2 marks · HardDescribe one way in which the arrangement of particles in a liquid differs from that in a gas, and one way the movement of the particles differs.
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Also accept: Arrangement: In a liquid, the particles are close together but not in a regular pattern; in a gas, the particles are far apart and randomly arranged.; Movement: In a liquid, particles move past each other but remain in contact; in a gas, particles move rapidly in all directions and are not in contact.
Common mistakes: Saying particles are 'touching' in liquids but not in gases without mentioning closeness and arrangement.; Describing only the movement without referencing arrangement (or vice versa).
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Marking points
B1 · 1 mark · Correct difference in arrangement (e.g. liquid particles close together, gas particles far apart).
B2 · 1 mark · Correct difference in movement (e.g. liquid particles move randomly but remain in contact, gas particles move quickly in all directions and are not in contact).
Worked solution
One way the arrangement differs is that the particles in a liquid are close together but not in a regular pattern, while in a gas the particles are far apart and randomly arranged.
One way their movement differs is that particles in a liquid move randomly but stay close together, while in a gas the particles move much more rapidly in all directions and are not in contact.