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CAIE A-Level Chemistry AS 11.1.2 Trend in the Bond Strength of the Halogen Questions

Practise describing X–X bond-strength data and explaining differences through atomic size, bond length and orbital overlap.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • read or compare X–X bond energies directly rather than using intermolecular-force trends
  • explain a weaker Br–Br than Cl–Cl bond using larger atoms, longer bond length and poorer orbital overlap
  • separate covalent X–X bond strength from the London forces acting between halogen molecules

CAIE A-Level Chemistry AS 11.1.2 Trend in the Bond Strength of the Halogen Questions question 1

[Maximum number: 1]

The strengths of the covalent bonds within halogen molecules, and the van der Waals' forces between halogen molecules, vary going down Group 17 from chlorine to bromine to iodine.

Which row shows these correctly?

strength of covalent bonds

strength of van der Waals' forces

decreases

decreases

decreases

increases

increases

decreases

increases

increases

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