A-LevelChemistryReaction kinetics9701/12 · Feb/Mar 2022 · Q161 Mark

In the reaction shown, the concentrations of both X and Y are reduced to half of their original values whilst keeping the total volume of the solution constant. X(aq) + Y(aq) → XY(aq) Simultaneously the temperature is increased from 298 K to 348 K. Which prediction is definitely true?

Asmaller proportion of collisions between particles of X and particles of Y will be successful.

BThe average kinetic energy of particles of X and particles of Y will increase.

CThe rate of the reaction will be unaffected.

DThe frequency of collisions between particles of X and particles of Y will halve.

✓ Correct answer

B: The average kinetic energy of particles of X and particles of Y will increase.

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Topic: Reaction kinetics, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Feb/Mar 2022 Paper 1 Variant 2, question 16.

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