Energetics

Enthalpy change def

enthalpy change is the heat energy change measured under conditions of standard pressure. Units are kJ/mol.

Bond enthalpy def

bond enthalpy is the energy required to break a particular covalent bond in one mole of a molecule in a gaseous state.

activation energy def

the activation energy is the minimum amount of energy required for a reaction to occur.

molar enthalpy change of formation

the enthalpy change when 1 mole of substance is formed from its elements under standard conditions, all reactants and products in their standard states.

molar enthalpy change of combustion

the enthalpy change when one mole of substance is completely burned in oxygen under standard conditions, all reactants and products in their standard states.

molar enthalpy change of neutralisation

the enthalpy change when an acid and alkali react to form one mole of water under standard conditions.

state hess’s law

the total enthalpy change of a reaction is independent of the route taken.

specific heat capacity def

the energy required to raise 1g of a substance by 1K without a change in state.