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15 Cards in this Set

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  • Back

Enthalpy of formation

Enthalpy change when 1 mole of a substance is formed from its constituent elements with all substances in their standard states.


Exothermic for most.

Enthalpy of combustion

Enthalpy change when 1 mole of a substance undergoes complete combustion in oxygen with all substances in their standard states.


Exothermic.

Enthalpy of neutralisation

Enthalpy change when 1 mole of water is formed in a reaction between an acid and alkali under standard conditions.


Exothermic

Ionisation enthalpy - 1st ionisation energy.

Enthalpy change when each atom in 1 mole of gaseous atoms loses 1 electron to form 1 mole of gaseous 1+ ions.


Endothermic.

Ionisation enthalpy - 2nd ionisation energy.

Enthalpy change when each ion in 1 mole of gaseous 1+ ions loses 1 electron to form 1 mole of gaseous 2+ ions.


Endothermic.

Electron affinity - 1st

Enthalpy change when each atom in 1 mole of gaseous atoms gains 1 electron to form 1 mole of gaseous 1- ions.


Exothermic for many non-metals.

Electron affinity - 2nd

Enthalpy change when each ion in 1 mole of gaseous 1- ions gains 1 electron to form 1 mole of gaseous 2- ions.


Endothermic - adding -ve electron to -ve ion.

Enthalpy of atomisation

Enthalpy change when 1 mole of gaseous atoms is produced from an element in its standard state.


Endothermic.

Hydration enthalpy

Enthalpy change when 1 mole of gaseous ions becomes hydrated (dissolved in water).


Exothermic.

Enthalpy of solution

Enthalpy change when 1 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.


Bond dissociation enthalpy

Enthalpy change when 1 mole of covalent bonds is broken in the gaseous state.


Endothermic.

Lattice enthalpy of formation

Enthalpy change when 1 mole of a solid ionic compound is formed from its constituent ions in the gas phase.


Exothermic.

Lattice enthalpy of dissociation

Enthalpy change when 1 mole of a solid ionic compound is broken up into it's constituent ions in the gas phase.


Endothermic.

Enthalpy of vaporisation

Enthalpy change when 1 mole of a liquid is turned into a gas.


Endothermic.

Enthalpy of fusion

Enthalpy change when 1 mole of a solid is turned into a liquid.


Endothermic