O-LevelChemistryRates of Reaction5070/11 · May/June 2021 · Q181 Mark

Which changes will speed up a chemical reaction? 1 decreasing the pressure in a reaction between gases 2 increasing the size of the solid particles in a reaction involving solids 3 increasing the temperature of any reaction 4 increasing the concentration of a solution

A1 and 3

B2, 3 and 4

C3 and 4 only

D4 only

✓ Correct answer

C: 3 and 4 only

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2021 Paper 1 Variant 1, question 18.

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