O-LevelChemistryRates of Reaction5070/11 · Oct/Nov 2017 · Q11 Mark

A purple pill is placed in a beaker of water. The beaker is left for several hours. The diagram shows the appearance of the water when the pill is added and several hours later. Which statement explains why this change occurs?

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ADiffusion occurs because the pill is coloured.

BDiffusion occurs faster at higher temperatures.

CDiffusion occurs from an area of high concentration to one of lower concentration.

DGases diffuse faster than liquids.

✓ Correct answer

C: Diffusion occurs from an area of high concentration to one of lower concentration.

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2017 Paper 1 Variant 1, question 1.

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