Definations

• The enthalpy of atomisation is the enthalpy change when one mole of gaseous atoms is formed from the element in its standard state.
• the first electron affinity is the enthalpy change when one mole of electron is added to form one mole of gaseous 1- ions.
• the first ionisation energy is the enthalpy required to remove one electron from each atom in one mole of gaseous atoms.
• the lattice enthalpy is the enthalpy change when one mole of an ionic compound is formed from its gaseous ions under standard conditions.
• the enthalpy of solution is the enthalpy change when one mole of a solute dissolves in a solvent.
• the enthalpy of hydration is the enthalpy change when one mole of gaseous ions is dissolved in water to form one mole of aqueous ions.
• the enthalpy of formation is the enthalpy change when one mole of a compound is formed from its constituent elements under standard conditions with all species in their standard states.
• the enthalpy change of combustion is the enthalpy change when one mole of a substance reacts completely with oxygen under standard conditions with all reactants and products in their standard states.
• the enthalpy change of neutralisation is the enthalpy change when an acid and a base react in a neutralisation reaction to form one mole of water.
• the enthalpy change of reaction is the enthalpy change when a reaction takes place in the molar quantities shown in the chemical equation with all reactants in their standard states.