A-LevelChemistryReaction kinetics9701/12 · Feb/Mar 2021 · Q101 Mark

A large excess of marble chips is reacted with 25 cm³ of 1.0 mol dm⁻³ hydrochloric acid at 40 °C. How is the result different when the reaction is repeated with 60 cm³ of 0.5 mol dm⁻³ hydrochloric acid at 40 °C?

AThe reaction is faster and more of the products are made when the reaction is complete.

BThe reaction is faster and less of the products are made when the reaction is complete.

CThe reaction is slower and more of the products are made when the reaction is complete.

DThe reaction is slower and less of the products are made when the reaction is complete.

✓ Correct answer

C: The reaction is slower and more of the products are made when the reaction is complete.

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Topic: Reaction kinetics, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Feb/Mar 2021 Paper 1 Variant 2, question 10.

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