Enthalpy and entropy

Standard enthalpy of atomisation

The enthalpy change to form 1 mole of gaseous atoms from an element in its standard state under standard conditions

Lattice enthalpy of formation

The enthalpy change to form 1 mole of an ionic compound from its gaseous ions

Standard enthalpy of formation

The enthalpy change when 1 mole of a compound is formed from its elements under standard conditions with all reactants and products in their standard states

Standard enthalpy of combustion

The enthalpy change when 1 mole of a substance reacts completely with oxygen under standard conditions with all reactants and products in their standard states

Standard enthalpy of hydration

The enthalpy change when 1 mole of aqueous ions are formed from their gaseous ions under standard conditions

Standard enthalpy change of solution

Enthalpy change when 1 mole of a compound is dissolved in water under standard conditions

First ionisation energy

The energy required to remove 1 electron from each atom in 1 mole of gaseous atoms to form 1 mole of gaseous 1+ ions

First electron affinity

The enthalpy change when 1 electron is added to each atom in 1 mole of gaseous atoms to form 1 mole of gaseous 1- ions

Second electron affinity

The enthalpy change when 1 electron is added to each atom in 1 mole of gaseous 1- ions to form 1 mole of gaseous 2- ions

Entropy

The measure of the dispersal of energy within the chemicals making up the chemical system

Standard entropy

The entropy of 1 mole of a substance under standard conditions