Chapter 22 Enthalpy and entropy

lattice enthalpy

the enthalpy change that accompanies the formation of one mole of an ionic compound from its gaseous ions under standard conditions

enthalpy change of atomisation

the enthalpy change that occurs when one mole of gaseous atoms is formed from the elements in its standard state

first ionisation enthalpy

the enthalpy change required to remove one electron from each atom in one mole of gaseous atoms to form one mole of gaseous 1+ ions

first electron affinity 

the enthalpy change that takes place when one electron is added to each atom in one mole of gaseous atoms to form one mole of gaseous 1- ions 

enthalpy change of solution

the enthalpy change that occurs when one mole of a solute dissolves completely in a solvent water

enthalpy change of hydration

the enthalpy change that accompanies the dissolving of gaseous ions to form one mole of aqueous ions e

entropy

a measure of the dispersal of energy and disorder within the chemicals making up the chemical system