O-LevelChemistryRates of Reaction5070/12 · May/June 2023 · Q161 Mark

The volume of gas produced by the reaction of 100cm³ of hydrochloric acid with an excess of calcium carbonate is measured in two experiments. The volumes of gas are measured at r.t.p. and the results are shown. Which one change in conditions to experiment 1 gives the results for experiment 2? Assume all other conditions are unchanged.

Agreater volume of acid is added.

Bhigher concentration of acid is used.

CSmaller pieces of calcium carbonate are used.

DThe temperature of the acid is higher.

✓ Correct answer

B: higher concentration of acid is used.

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2023 Paper 1 Variant 2, question 16.

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