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CAIE IGCSE Chemistry Temperature Pressure and Gas Particles

CAIE IGCSE Chemistry Temperature Pressure and Gas Particles
Cambridge IGCSE Chemistry 0620 syllabus for exams in 2026, 2027 and 20282026–2028

Practise explaining gas pressure and volume changes through particle speed, collision frequency or force and average separation at fixed conditions.

How this is tested

  • explain higher pressure in a fixed volume by faster particles colliding more often and harder with walls
  • at constant pressure, link heating to faster particles and expansion that increases their separation
  • when temperature and pressure both rise at fixed volume, increase speed but keep average spacing unchanged

Question 1

[Maximum number: 1]

A gas is heated. The pressure is kept constant.
Which statement describes the behaviour of the particles in the gas?

A

The particles move faster and become closer together.

B

The particles move faster and become further apart.

C

The particles move more slowly and become closer together.

D

The particles move more slowly and become further apart.