enthalpy definitions

enthalpy change

change in the heat content of a system during a reaction

enthalpy change of atomisation

enthalpy change that takes place when one mole of gaseous atoms is formed from an element in its standard states

enthalpy change of formation

enthalpy change that takes place when one mole of a compound is formed from its constituent elements

enthalpy change of hydration

enthalpy change that takes place when one mole of gaseous ions are dissolved in water

enthalpy change of solution

enthalpy change that takes place when one mole of solute is dissolved

first electron affinity

amount of energy released when an electron is added to one mole of gaseous atoms, forming one mole of -1 ions

first ionisation energy

removal of one electron from one mole of gaseous atoms to form one mole of +1 ions

lattice enthalpy

formation of one mole of an ionic compound from gaseous ions

average bond enthalpy

energy required to break one mole of gaseous bonds

enthalpy change of combustion

enthalpy change that takes place when one mole of a substance is completely combusted

enthalpy of neutralisation

enthalpy change that takes place when one mole of water is formed from a neutralisation reaction

enthalpy change of reaction

enthalpy change associated with a particular chemical reaction