AQA A-Level Chemistry - Born-Haber Cycles Definitions

Enthalpy Change

Heat energy change at constant pressure.

Enthalpy of Lattice Dissociation

Enthalpy change when one mole of an ionic compound is separated into its component gaseous ions.

Enthalpy of Lattice Formation

Enthalpy change when one mole of an ionic compound is formed from its constituent ions in the gaseous state.

Enthalpy of Atomisation

Enthalpy change for the formation of one mole of gaseous atoms from the element in its standard state.

Bond dissociation enthalpy

Value for enthalpy change to break one mole of a covalent bond under standard conditions in the gaseous state.

First Ionisation enthalpy

Enthalpy change when one mole of electrons is removed from one mole of gaseous atoms to form one mole of gaseous ions with a single positive charge.

First Electron affinity

Enthalpy change when one mole of gaseous atoms forms one mole of negative ions with a single negative charge.

Enthalpy of solution

Enthalpy change when one mole of an ionic substance dissolves in water.

Enthalpy of hydration

Enthalpy change when one mole of gaseous ions is converted into one mole of aqueous ions.