Born Haber Definitions

Question 1

Lattice association/formation enthalpy

Answer 1

The enthalpy change when one mole of crystalline/solid ionic substance is formed from its constituent ions in their gaseous state under standard conditions

Question 2

Lattice dissociation enthalpy

Answer 2

The enthalpy change when one mole of crystalline/solid ionic substance breaks up into its constituent ions in their gaseous state under standard conditions

Question 3

First Ionisation Energy

Answer 3

The enthalpy change when one mole of gaseous atoms loses one electron per atom under standard conditions

Question 4

Second Ionisation Energy

Answer 4

The enthalpy change when one mole of gaseous +1 ions lose one electron per atom under standard conditions

Question 5

First Electron Affinity Enthalpy

Answer 5

The Enthalpy change when one mole of gaseous atoms gains one electron per atom under standard conditions

Question 6

Second Electron Affinity Enthalpy

Answer 6

The Enthalpy change when one mole of gaseous -1 ions gain an electron per atom under standard conditions

Question 7

Hydration Enthalpy

Answer 7

The Enthalpy change when one mole of gaseous ions become hydrated or aqueous

Question 8

Enthalpy of Solution

Answer 8

The Enthalpy change when one mole of an ionic solid dissolves into enough water to completely separate all the ions

Question 9

Enthalpy of Formation

Answer 9

The Enthalpy change when one mole of a substance is formed from its constituent elements in their standard states under standard conditions

Question 10

Enthalpy of Combustion

Answer 10

The Enthalpy change when one mole of a substance is completely combusted in oxygen in their standard states under standard conditions

Question 11

Enthalpy of Atomisation

Answer 11

The Enthalpy change when one mole of gaseous atoms are produced from one mole of standard state elements

Question 12

Enthalpy of Bond Dissociation

Answer 12

Enthalpy change when one mole of a covalent bond is broken in the gaseous state