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CAIE A-Level Chemistry AS 5.1.6 Some Bond Energies Are Exact and Some Bond Questions

Practise distinguishing exact bond energies from average bond energies and applying them to reaction enthalpy calculations using CAIE 9701 AS evidence.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • Distinguish exact bond energies from average bond energies when interpreting enthalpy calculations.

CAIE A-Level Chemistry AS 5.1.6 Some Bond Energies Are Exact and Some Bond Questions question 1

[Maximum number: 1]

The table shows bond energies for some diatomic molecules. Deuterium, D, is an isotope of hydrogen.

Table for Question CAIE A-Level Chemistry AS 5.1.6 Some Bond Energies Are Exact and Some Bond Questions question 1 — CAIE A-Level Chemistry AS

Which statements are correct?

1 Diatomic molecules have exact values for their bond energies, which are always positive.

2 The trend in Group 7 bond energies can be explained by the variation in instantaneous dipole-induced dipole (id-id) forces.

3 A value for the enthalpy change for the reaction between deuterium and chlorine can be calculated using these data alone.

A

1 only

B

1 and 2 only

C

1 and 3 only

D

2 and 3 only

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