O-LevelChemistryRates of Reaction5070/11 · Oct/Nov 2022 · Q211 Mark

A sample of sulfuric acid is added to 10g of zinc granules. A reaction occurs and a gas is produced. The rate of the reaction is increased if a small amount of copper is added. The copper is unchanged after the reaction. Which statement about this reaction is correct?

ACopper acts as a biological catalyst in this reaction.

BCopper lowers the activation energy of this reaction.

CThe rate of the reaction is greater as the particle size of the zinc is greater.

DThe rate of the reaction is greater if the pressure is increased.

✓ Correct answer

B: Copper lowers the activation energy of this reaction.

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2022 Paper 1 Variant 1, question 21.

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