Born Haber Definitions

Standard molar enthalpy of formation

enthalpy change when one mole of substance is formed from its constituent elements under standard conditions, all reactants and products being in their standard states

nucleophile 

lone pair donor 

electrophile

lone pair acceptor

Standard molar enthalpy of combustion

enthalpy change when one mole of atoms is burned completely in oxygen, all reactants and products being in their standard states under standard conditions

Standard enthalpy of atomisation

enthalpy change when one mole of gaseous atoms is formed from the element in its standard state

entropy

measure of disorder in a system

First ionisation energy

standard enthalpy change when one mole of gaseous atoms is converted into a mole of gaseous ions each with a single positive charge

First electron affinity

The standard enthalpy change when one mole of gaseous atoms is converted into a mole of gaseous ions each with a single negative charge.

Lattice enthalpy of formation

The standard enthalpy change when one mole of solid ionic compound is formed from its gaseous ions

Enthalpy of lattice dissociation

The standard enthalpy change when one mole of solid ionic compound dissociates into its gaseous ions

Enthalpy of hydration

The standard enthalpy change when one mole of gaseous ions is converted into aqueous ions

Enthalpy of solution

The standard enthalpy change when one mole of solute dissolves completely in sufficient solvent to form a solution in which the molecules or ions are far enough apart not to interact with each other.

bond enthalpy

the energy required to break one mole of the specific bond forming gaseous atoms, under standard conditions averaged over a range of compounds

hess’s law

enthalpy change of a reaction is independent to the reaction route

relative molecular mass

average mass of one molecule relative to 1/12 the mass of a carbon-12 atom

relative atomic mass

average mass of an atom of an element relative to 1/12 the mass of a carbon-12 atom