A-LEVEL CHEMISTRY DEFINITIONS, ENTHALPY. Trusted by students across multiple disciplines!

A-LEVEL CHEMISTRY DEFINITIONS, ENTHALPY.
Trusted by students across multiple disciplines!
First Ionisation energy - Answer: The energy required to remove 1 mole of electrons
from 1 mole of gaseous atoms.


Enthalpy change of reaction - Answer: The enthalpy change associated with a stated
equation


Enthalpy change of formation - Answer: The enthalpy change when 1 mole of a
compound is formed from its elements in their standard states under standard
conditions


Enthalpy change of combustion - Answer: The enthalpy change when 1 mole of a
substance is completely burned in excess oxygen under standard conditions


Enthalpy change of neutralisation - Answer: The enthalpy change when an acid and
alkali react to form 1 mole of water, under standard conditions.


Average bond enthalpy - Answer: The average enthalpy change on breaking 1 mole of
bonds in gaseous molecules.


Lattice enthalpy - Answer: The enthalpy change when 1 mol of ionic lattice is formed
from gaseous ions


Enthalpy change of atomisation - Answer: The enthalpy change that takes place for the
formation of one mole of gaseous atoms from the element in its standard state under
standard conditions.


1st Electron affinity - Answer: The enthalpy change that takes place when one electron
is added to each atom in one mole of gaseous atoms to form one mole of gaseous 1-
ions.

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