Enthalpy changes Flashcards
Define enthalpy change
The heat energy transferred in a reaction at a constant pressure
Define activation energy
The minimum amount of energy needed to break bonds of the reactants
Why do u need standard conditions
Changes in enthalpy are affected by temperature and pressure
Define standard enthalpy of reaction
The enthalpy change when the reaction occurs in the molar quantities shown in the chemical equation under sc
Define enthalpy change of formation
Formation of 1 mole of a compound from its elements under sc
Enthalpy change of combustion
The complete combustion of 1 mole of a substance under sc
Enthalpy of neutralisation
Formation of 1 mole of water from an acid and alkali reaction
Define average bond enthalpy
The energy needed to break 1 mole of bonds in the gas phase
Averaged over many different compounds
