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CAIE A-Level Chemistry AS 5.1.2 Construct Interpret a Reaction Pathway Diagram Questions

Practise drawing and interpreting reaction pathway diagrams, activation energy and enthalpy changes using CAIE 9701 AS questions and mark schemes.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • Construct and interpret reaction pathway diagrams showing enthalpy change and activation energy.

CAIE A-Level Chemistry AS 5.1.2 Construct Interpret a Reaction Pathway Diagram Questions question 1

[Maximum number: 1]

For a particular reversible reaction the backward reaction is endothermic.
The activation energy of the backward reaction is 160 kJ mol−1160 \mathrm{~kJ} \mathrm{~mol}^{-1}.
It can be assumed that the backward reaction proceeds by a mechanism that is the exact reverse of the mechanism for the forward reaction.

Which statement about the activation energy of the forward reaction is correct?

A

The activation energy of the forward reaction is equal to −160 kJ mol−1-160 \mathrm{~kJ} \mathrm{~mol}^{-1}.

B

The activation energy of the forward reaction is 0 kJ mol−10 \mathrm{~kJ} \mathrm{~mol}^{-1} but less than +160 kJ mol−1+160 \mathrm{~kJ} \mathrm{~mol}^{-1}.

C

The activation energy of the forward reaction is equal to +160 kJ mol−1+160 \mathrm{~kJ} \mathrm{~mol}^{-1}.

D

The activation energy of the forward reaction is greater than +160 kJ mol−1+160 \mathrm{~kJ} \mathrm{~mol}^{-1}.

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