Edexcel IGCSE Chemistry 1.3 Diffusion & dilution
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
1.3 Diffusion and dilution 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.
- the process is called diffusion
- particles spread out evenly throughout the water / solution / liquid
Allow:
- particles move from an area of high concentration to an area of low concentration
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