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A-Level Edexcel Chemistry Anion Polarisation

Review A-Level Edexcel Chemistry anion polarisation through Born-Haber evidence, covalent character and lattice-energy differences.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
A2

Exam points

  • predict greatest covalent character from small cations and large polarisable anions
  • explain more exothermic experimental lattice energy through anion polarisation
  • link Born-Haber lattice-energy differences to stronger partially covalent bonding

12.15—Polarisation of anions by cations leads to some covalency in an ionic bond, based on evidence from the Born-Haber cycle question 1

[Maximum number: 1]

Experimental lattice energy values determined using the Born-Haber cycle often differ from calculated theoretical values.
The ionic radii and charges of some ions are shown.
P, Q, R and S are not the chemical symbols of the elements.

Table for Question 12.15—Polarisation of anions by cations leads to some covalency in an ionic bond, based on evidence from the Born-Haber cycle question 1 — Edexcel A-Level Chemistry A2

Which of these compounds would be expected to show the largest percentage difference between the experimental and theoretical lattice energies?

A

PR

B

PS

C

QR

D

QS

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