O-LevelChemistryRates of Reaction5070/12 · Oct/Nov 2022 · Q221 Mark

Carbonates react with dilute acids to produce carbon dioxide. A student uses excess carbonate and 100 cm³ of 0.1 mol/dm³ acid and measures the volume of gas produced at regular time intervals. The results give line X on the graph. The student repeats the experiment using 50 cm³ of 0.2 mol/dm³ acid whilst keeping everything else the same. Which line shows the results for the second experiment?

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ADiagram A

BDiagram B

CDiagram C

DDiagram D

✓ Correct answer

B: Diagram B

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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 2, question 22.

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