O-LevelChemistryRates of Reaction5070/11 · May/June 2016 · Q191 Mark

The diagram shows the apparatus used to measure the rate of the reaction between calcium carbonate and dilute hydrochloric acid. The mass of the flask and the contents is measured at regular intervals of time. Which graph correctly shows how the mass of the flask and contents changes with time?

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Agraph showing mass decreasing with a concave-up curve and levelling off.

Bgraph showing mass increasing with a concave-down curve and levelling off.

Cgraph showing mass decreasing with a concave-down curve and levelling off.

Dgraph showing mass decreasing abruptly and then remaining constant.

✓ Correct answer

C: graph showing mass decreasing with a concave-down curve and levelling off.

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2016 Paper 1 Variant 1, question 19.

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