Edexcel A-Level Chemistry A2 12.18 The Effect of Ionic Charge and Ionic Radius on the Values of Enthalpy Change of Hydration and the Lattice Energy of an Ionic Questions

Write every species with state and stoichiometry, split multi-electron or atomisation steps correctly and apply Hess signs according to arrow direction.

Exam points

Complete Born–Haber cycles with correct species, states, coefficients and labelled arrows.
Identify whether an arrow represents one process or a sum of energy changes.
Calculate a missing lattice, atomisation, ionisation or electron-affinity value from the cycle.

[Maximum number: 3]

This question concerns calcium chloride, $\mathrm{CaCl}_{2}$ .

The table shows the theoretical lattice energies of some chlorides of Group 2.

Table for Question Edexcel A-Level Chemistry A2 12.18 The Effect of Ionic Charge and Ionic Radius on the Values of Enthalpy Change of Hydration and the Lattice Energy of an Ionic Questions question 1 — Edexcel A-Level Chemistry A2

Explain the trend in theoretical lattice energies on descending Group 2.
(3)

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Edexcel A-Level Chemistry A2 12.18 The Effect of Ionic Charge and Ionic Radius on the Values of Enthalpy Change of Hydration and the Lattice Energy of an Ionic Questions question 1