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Definitions: Enthalpy changes

For the following, let AB represent a compound


* ‘The energy change when…’


Lattice Enthalpy

*… 1 mole of an ionic compound is formed from its gaseous ions under STP (298K, 100kPa).

Always exothermic

Standard Enthalpy Change of Formation

*… 1 mole of compound is formed from its constituent elements in their standard state.

Usually exothermic.

Standard Enthalpy Change of Atomisation

*… 1 mole of gaseous atoms are formed from the element in its standard state.

Always endothermic (bonds are broken)

1st Ionisation Energy

*… 1 mole of gaseous 1+ ions is formed from gaseous atoms

Always endothermic (an electron overcomes the attraction from the nucleus)