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Enthalpy Defenitions

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Total cards: 15•Content version: v3•Public deck•Updated: 8/1/2026

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#1
Front (Question)

Enthalpy of formation

Back (Answer)

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

#2
Front (Question)

Enthalpy of combustion

Back (Answer)

Enthalpy change when one mole of a substance is completely combusted in oxygen with all substances in standard states.

#3
Front (Question)

Enthalpy of neutralisation

Back (Answer)

Enthalpy change when one mole of water is formed from an acid and alkali under standard conditions (25C and 100KPa)

#4
Front (Question)

First ionisation energy

Back (Answer)

Enthalpy change when one mole of gaseous atoms loses one electron to form one mole of gaseous 1+ ions

#5
Front (Question)

Second ionisation energy

Back (Answer)

Enthalpy change when one mole of gaseous 1+ ions loses one electron to form one mole of gaseous 2+ ions

#6
Front (Question)

First electron affinity

Back (Answer)

Enthalpy change when one mole of gaseous atoms gains one electron each to form one mole of gaseous 1- ions

#7
Front (Question)

Second electron affinity

Back (Answer)

Enthalpy change when one mole of gaseous 1- ions gains one electron each to form one mole of gaseous 2- ions

#8
Front (Question)

Enthalpy of atomisation

Back (Answer)

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

#9
Front (Question)

Hydration enthalpy

Back (Answer)

Enthalpy change when one mole of gaseous ions become hydrated

#10
Front (Question)

Enthalpy of solution

Back (Answer)

Enthalpy change when one mole of an ionic solid dissolves in water large enough so that it’s ions are well separated and not interact with each other

#11
Front (Question)

Bond dissociation enthalpy

Back (Answer)

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

#12
Front (Question)

Lattice Enthalpy of formation

Back (Answer)

Enthalpy change when one mole of a solid ionic compound is formed from its gaseous ions

#13
Front (Question)

Lattice enthalpy of dissociation

Back (Answer)

Enthalpy change when one mole of a solid ionic compound is broken up into its gaseous ions

#14
Front (Question)

Enthalpy of vaporisation

Back (Answer)

Enthalpy change when one mole of liquid is turned into gas

#15
Front (Question)

Enthalpy of fusion

Back (Answer)

Enthalpy change when one mole of a solid is turned into a liquid