Chapter 22 - Enthalpy and Entropy

Lattice enthalpy of formation

The enthalpy change when one mole of an ionic compound is formed from its gaseous ions under standard conditions

Standard enthalpy of atomisation

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

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 hydration

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

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 change of solution

The 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

Second ionisation energy

The energy required to remove 1 electron from each atom in 1 mole of gaseous 1+ ions to form 1 mole of gaseous 2+ 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

Q=mcΔT

m is the mass of the solution that is changing temperature