DF1 enthalpy changes

Enthalpy change for formation

the enthalpy change that occurs when one mole of a substance is formed from its elements under standard conditions

Standard enthalpy change for a reaction

the enthalpy change when molar quantities of reactants, as stated in the equation, react together under standard conditions

Standard enthalpy change of combustion

the enthalpy change that occurs when one mole of a substance is burnt completely in oxygen under standard conditions

Enthalpy change of neutralisation

the enthalpy change when one mole of water is created from the reaction between an acid and an alkali in aqueous solutions under standard conditions.