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CAIE A-Level Chemistry AS 3.4.3 Terms Questions

Practise defining bond energy and bond length, calculating or comparing covalent bond strengths, and explaining molecular reactivity in CAIE 9701 AS questions with mark schemes.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • Define bond energy and bond length, then use them to compare the reactivity of covalent molecules.

CAIE A-Level Chemistry AS 3.4.3 Terms Questions question 1

[Maximum number: 1]

Which equation represents an enthalpy change that is the average bond energy of the C-H bond in methane?

A

14C(g)+H(g)→14CH4( g)\frac{1}{4} \mathrm{C}(\mathrm{g})+\mathrm{H}(\mathrm{g}) \rightarrow \frac{1}{4} \mathrm{CH}_{4}(\mathrm{~g})

B

14CH4( g)→14C(g)+H(g)\frac{1}{4} \mathrm{CH}_{4}(\mathrm{~g}) \rightarrow \frac{1}{4} \mathrm{C}(\mathrm{g})+\mathrm{H}(\mathrm{g})

C

CH4( g)→C(g)+4H(g)\mathrm{CH}_{4}(\mathrm{~g}) \rightarrow \mathrm{C}(\mathrm{g})+4 \mathrm{H}(\mathrm{g})

D

CH4( g)→CH3( g)+H(g)\mathrm{CH}_{4}(\mathrm{~g}) \rightarrow \mathrm{CH}_{3}(\mathrm{~g})+\mathrm{H}(\mathrm{g})

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