Chemistry · Oct / Nov 2024 · Paper 11 · Question 15
5070Rate of reaction
Calcium carbonate reacts with excess dilute hydrochloric acid to form carbon dioxide. The reaction is investigated in two experiments. The rate of the reactions is compared by measuring the volume of carbon dioxide formed over time in each experiment. The two rates are compared by plotting graphs. [graph: volume of CO2 against time, experiment 1 and experiment 2] Which statement about experiments 1 and 2 is correct?
- AExperiments 1 and 2 both slow down as the reaction proceeds.
- BExperiments 1 and 2 must both use acid of the same concentration.
- CExperiments 1 and 2 must have been done at the same temperature.
- DExperiment 2 uses larger lumps of calcium carbonate. All other conditions stay the same.
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Correct answer: A. Experiments 1 and 2 both slow down as the reaction proceeds.
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