enthalpy definitions

enthalpy change of formation

enthalpy change when one mole of a compound is formed from its elements in their standard states

enthalpy change of combustion

the enthalpy change when 1 mole of a substance is burned completely in oxygen under standard conditions

enthalpy change of neutralisation

the enthalpy change that accompanies the reaction of an acid with a base to form 1 mole of water under standard conditions

lattice enthalpy

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

enthalpy of solution

enthalpy change of one mole of a solute is completely dissolved in water under standard conditions

enthalpy of hydration

enthalpy change when one mole of isolated gaseous ions dissolve in water forming one mole of aqueous ions under standard conditions

entropy

the dispersal of energy and disorder within the chemicals making up the chemicals system

first IE

the energy required to remove one electron from each atom in one mole of gaseous atoms of an element to form one mole of a gaseous 1+ ion

enthalpy

the heat content that is stored in a chemical system

enthalpy change of a reaction

the enthalpy change that accompanies a reaction in the molar quantities expressed in a chemical equation under standard conditions

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