AQA A level Chemistry 3.1.8-
Thermodynamics
What are standard conditions? - 298K/25°C
100kPa/1 atm
1 moldm-3
Enthalpy change of formation - The enthalpy change when 1 mole of a compound
is formed from its constituent elements under standard conditions, with all
reactants and products in their standard states.
Enthalpy change of combustion - The enthalpy change when 1 mole of a
substance is burned completely in oxygen.
Enthalpy change of atomisation - The enthalpy change that accompanies the
formation of 1 mole of gaseous atoms from the element in its standard state.
First ionisation enthalpy - The enthalpy change when 1 mole of gaseous atoms
loses 1 electron per atom to form 1 mole of gaseous 1+ ions.
Second ionisation enthalpy - The enthalpy change when 1 mole of gaseous 1+ ions
loses 1 electron per atom to form 1 mole of gaseous 2+ ions.
, AQA A level Chemistry 3.1.8-
Thermodynamics
First electron affinity - The enthalpy change when 1 mole gaseous atoms gains 1
electron per atom to form 1 mole of gaseous 1- ions.
Second electron affinity - The enthalpy change when 1 mole of gaseous 1- ions
gains 1 electron per atom to form 1 mole of gaseous 2- ions.
Mean bond enthalpy - The enthalpy change when 1 mole of gaseous molecules
each breaks a covalent bond to form 2 gaseous ions or free radicals.
Lattice enthalpy of formation - The enthalpy change when 1 mole of a solid ionic
compound is formed from its gaseous ions.
Lattice enthalpy of dissociation - The enthalpy change when 1 mole of a solid ionic
compound dissociates into its gaseous ions.
Enthalpy of hydration - The enthalpy change when 1 mole of gaseous ions
dissolves completely in water.
Thermodynamics
What are standard conditions? - 298K/25°C
100kPa/1 atm
1 moldm-3
Enthalpy change of formation - The enthalpy change when 1 mole of a compound
is formed from its constituent elements under standard conditions, with all
reactants and products in their standard states.
Enthalpy change of combustion - The enthalpy change when 1 mole of a
substance is burned completely in oxygen.
Enthalpy change of atomisation - The enthalpy change that accompanies the
formation of 1 mole of gaseous atoms from the element in its standard state.
First ionisation enthalpy - The enthalpy change when 1 mole of gaseous atoms
loses 1 electron per atom to form 1 mole of gaseous 1+ ions.
Second ionisation enthalpy - The enthalpy change when 1 mole of gaseous 1+ ions
loses 1 electron per atom to form 1 mole of gaseous 2+ ions.
, AQA A level Chemistry 3.1.8-
Thermodynamics
First electron affinity - The enthalpy change when 1 mole gaseous atoms gains 1
electron per atom to form 1 mole of gaseous 1- ions.
Second electron affinity - The enthalpy change when 1 mole of gaseous 1- ions
gains 1 electron per atom to form 1 mole of gaseous 2- ions.
Mean bond enthalpy - The enthalpy change when 1 mole of gaseous molecules
each breaks a covalent bond to form 2 gaseous ions or free radicals.
Lattice enthalpy of formation - The enthalpy change when 1 mole of a solid ionic
compound is formed from its gaseous ions.
Lattice enthalpy of dissociation - The enthalpy change when 1 mole of a solid ionic
compound dissociates into its gaseous ions.
Enthalpy of hydration - The enthalpy change when 1 mole of gaseous ions
dissolves completely in water.
