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CAIE A-Level Chemistry 23.1.1 Terms

Practise defining lattice energy and atomisation enthalpy, then writing equations with correct formulae, charges and state symbols.

Syllabus
2028–2030
Course
Chemistry 9701
Level
A2

Exam points

  • define lattice energy as formation of one mole of ionic solid from gaseous ions
  • write atomisation and formation equations with correct state symbols

23.1.1—Terms question 1

[Maximum number: 1]

Potassium chloride, KCl , and magnesium chloride, MgCl2\mathrm{MgCl}_{2}, are both ionic solids.

Table 1.1

Table 1.1

Define the following terms.

enthalpy change of atomisation

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