O-LevelChemistryRates of Reaction5070/11 · May/June 2020 · Q171 Mark

The rate of reaction between calcium carbonate and hydrochloric acid is measured in three separate experiments. In experiment 1, the calcium carbonate is powdered and an excess of hydrochloric acid is used. In experiment 2, the calcium carbonate is in lumps and an excess of hydrochloric acid is used. In experiment 3, the calcium carbonate is in lumps but insufficient hydrochloric acid is used. The results of these experiments are shown. Which statement is correct?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

AExperiment 1 is shown by curve X.

BExperiment 1 is shown by curve Y.

CExperiment 2 is shown by curve Y.

DExperiment 3 is shown by curve Z.

✓ Correct answer

C: Experiment 2 is shown by curve Y.

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2020 Paper 1 Variant 1, question 17.

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