Aqa A Level Chemistry - Enthalpy Definitions

Front 1

Enthalpy change of formation

Back 1

The enthalpy change when one mole of a compound is formed from its elements in their standard states under standard conditions

Front 2

Bond dissociation enthalpy

Back 2

The enthalpy change when all the same type of bonds in a mole of gaseous molecules are broken

Front 3

Enthalpy change of the atomisation of an element

Back 3

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

Front 4

Enthalpy change of the atomisation of a compound

Back 4

The enthalpy change when one mole of a compound in its standard state forms gaseous atoms

Front 5

First ionisation enthalpy

Back 5

The enthalpy change when one mole of gaseous atoms forms one mole of gaseous 1+ ions and one mole of electrons

Front 6

Second ionisation enthalpy

Back 6

The enthalpy change when one mole of gaseous 1+ ions forms one mole of gaseous 2+ ions and one mole of electrons

Front 7

First electron affinity

Back 7

The enthalpy change when one mole of gaseous 1- ions is formed from one mole of gaseous ions

Front 8

Second electron affinity

Back 8

The enthalpy change when one mole of gaseous 1- ions forms one mole of gaseous 2- ions

Front 9

Enthalpy change of hydration

Back 9

The enthalpy change when one mole of gaseous ions forms one mole of aqueous ions

Hint 9

Front 10

Enthalpy change of solution

Back 10

The enthalpy change when one mole of a solute is dissolved in enough solvent that no further enthalpy change occurs on further dilution

Front 11

Standard enthalpy of combustion

Back 11

The enthalpy change when one mole of a substance is completely burned in oxygen under standard conditions.

Front 12

Lattice enthalpy of formation

Back 12

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

Front 13

Lattice enthalpy of dissociation

Back 13

The enthalpy change when one mole of a solid ionic compound is completely dissociated into its gaseous ions under standard conditions