Enthalpy Change

Define 'Enthalpy of Formation'

Enthalpy change when one mole of a substance of a mole is formed from its constituent elements with all substances in their standard states.

Define 'Enthalpy of Combustion'

Enthalpy change when one mole of a substance undergoes complete combustion in oxygen with all substances in standard states.

Define '1st Ionisation Enthalpy'

The first ionisation energy is the enthalpy change when one mole of gaseous atoms loses one electron per atom to produce gaseous 1+ ions.

Define '2nd Ionisation Enthalpy'

The second ionisation energy is when one mole of gaseous 2+ ions is produced from one mole of 1+ ions.

Define '1st Electron Affinity'

The first electron affinity is the enthalpy change when one mole of gaseous atoms gains one electron per atom to produce gaseous 1- ions.

Define '2nd Electron Affinity'

The second electron affinity is the enthalpy change when one mole of gaseous 1- ions gains one electron per ion to produce gaseous 2- ions.

Define 'Enthalpy of Atomisation'

Enthalpy change when one mole of gaseous atoms is produced from an element in its normal state.

Define 'Hydration Enthalpy'

Enthalpy change when one mole of gaseous ions become hydrated (dissolved in water).

Define 'Enthalpy of Solution'

Enthalpy change when one mole of an ionic solid dissolves in an amount of water large enough so that the dissolved ions are well separated and do not interact with each other.

Define 'Bond Dissociation Enthalpy'

Enthalpy change when one mole of covalent bonds is broken in the gaseous state.

Define ''Lattice Enthalpy of Formation

Enthalpy change when one mole of a solid ionic compound is formed into its constituent ions in the gas phase

Define 'Lattice Enthalpy of Dissociation'

Enthalpy change when one mole of a solid ionic compound is broken up into its constituent ions in the gas phase.

Enthalpy of Formation - Endothermic or Exothermic?

Exothermic

Enthalpy of Combustion - Endothermic or Exothermic?

Exothermic

1st Ionisation Enthalpy - Endothermic or Exothermic?

Endothermic

2nd Ionisation Enthalpy - Endothermic or Exothermic?

Endothermic

1st Electron Affinity - Endothermic or Exothermic?

Exothermic

2nd Electron Affinity - Endothermic or Exothermic?

Endothermic

Enthalpy of Atomisation - Endothermic or Exothermic?

Endothermic

Hydration Enthalpy - Endothermic or Exothermic?

Exothermic

Enthalpy of Solution - Endothermic or Exothermic?

It varies

Bond Dissociation Enthalpy - Endothermic or Exothermic?

Endothermic

Lattice Enthalpy of Formation - Endothermic or Exothermic?

Exothermic

Lattice Enthalpy of Dissociation - Endothermic or Exothermic?

Endothermic