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CAIE IGCSE Chemistry 1.2.1 Diffusion Using Kinetic Particle Questions

Explain diffusion in CAIE IGCSE Chemistry through random particle movement and concentration differences, then link faster spreading at higher temperature to particle energy.

Syllabus
2026–2028
Course
Chemistry 0620

Exam points

  • Identify diffusion when dissolved particles or gases spread out, including smells moving across a room.
  • Explain net movement from higher to lower concentration while recognising that individual particles move randomly.
  • Explain faster diffusion at higher temperature using greater particle energy and speed.
  • Distinguish evaporation of liquid perfume from subsequent diffusion of its vapour through air.

CAIE IGCSE Chemistry 1.2.1 Diffusion Using Kinetic Particle Questions question 1

[Maximum number: 1]

Which description of Brownian motion is correct?

A

random movement of particles due to bombardment by larger particles

B

random movement of particles due to bombardment by smaller particles

C

random movement of particles from a high concentration to a low concentration

D

random movement of particles from a low concentration to a high concentration

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