O-LevelChemistryRates of Reaction5070/11 · Oct/Nov 2024 · Q151 Mark
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. Which statement about experiments 1 and 2 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.
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.
✓ Correct answer
A: Experiments 1 and 2 both slow down as the reaction proceeds.
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