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Edexcel IGCSE Chemistry 1.3 Diffusion and Dilution Questions

Explain diffusion and dilution using particle movement, concentration changes and gas-tube evidence from coloured solutions and white-ring tests.

Syllabus
First assessment 2019
Course
Chemistry 4CH1

Exam points

  • link coloured-solution dilution to diffusion from high to low concentration
  • explain white-ring positions using relative molecular mass and gas particle speed
  • use particle collisions and random motion to explain slower gas diffusion

Edexcel IGCSE Chemistry 1.3 Diffusion and Dilution Questions question 1

[Maximum number: 2]

A dark purple liquid is diluted by adding water.
The diluted liquid becomes a pale purple colour.
Explain the process that causes this change.
Refer to particles in your answer.

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