Edexcel A-Level Chemistry A2 12.15 Polarisation of Anions By Cations Leads to Some Covalency in an Ionic Bond Based on Evidence From the Born Haber Cycle Questions

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

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

[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 Edexcel A-Level Chemistry A2 12.15 Polarisation of Anions By Cations Leads to Some Covalency in an Ionic Bond Based on Evidence From the Born Haber Cycle Questions 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?

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Edexcel A-Level Chemistry A2 12.15 Polarisation of Anions By Cations Leads to Some Covalency in an Ionic Bond Based on Evidence From the Born Haber Cycle Questions question 1