Born–Haber cycle
What Born–Haber cycle means in Chemistry A-Level, as defined for AQA, OCR.
Definitions of Born–Haber cycle
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Reference: AQA
A cycle used to calculate lattice enthalpies indirectly from values that can be measured, running from the elements in their standard states to the compound by two paths.
Applies Hess's law to build an ionic solid from its elements through gaseous ions, so the lattice enthalpy is obtained indirectly because it cannot be measured directly.
A cycle through which the relevant energy terms are combined so that the lattice enthalpy, which cannot be measured directly, is found from measurable quantities.
A cycle that applies Hess's Law to sum the constituent enthalpy changes to calculate lattice enthalpy or one of the other enthalpy changes.
Topics that use Born–Haber cycle
- Born–Haber cycles (A-level only) (AQA A-Level)
- Lattice enthalpy (OCR A-Level)
Related terms
- Electron affinity
- enthalpy of formation
- lattice dissociation enthalpy
- Lattice enthalpy
- Covalent character
- Effect of ionic charge and radius on lattice enthalpy
- Enthalpy change of hydration
- Enthalpy change of solution
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