Themodynamics Flashcards
Enthalpy change
Change in heat energy at constant pressure.
Enthalpy of combustion
Enthalpy change when one mole of a substance undergoes complete combustion in oxygen with all substances in standard states.
Enthalpy of neutralisation
Enthalpy change one mole of water is formed in a reaction between an acid and an alkaline standard conditions.
Ionisation enthalpy
First ionisation energy = enthalpy change when each atom in one mole of gaseous atoms loses one electron to form one mole of gaseous 1+ ions.
Electron affinity
First electron affinity = an enthalpy change when each atom in one mole of a gaseous atoms gains one electron to form one mole gaseous 1- ions.
Enthalpy atomisation
Enthalpy change when one mole of a gaseous atoms is produced from an element in its standard state.
Hydration enthalpy
Enthalpy change when one mole of gaseous ions become hydrated (dissolved in water).
Enthalpy of solution
Enthalpy change when one mole of an ionic solid dissolves in an amount of water large enough so that the dissolved ions are well separated and do not interact with each other.
Bond dissociation enthalpy
An enthalpy change when one mole of covalent bonds is broken in the gaseous state.
Lattice enthalpy of formation
Enthalpy change when one mole of a solid ionic compound is formed from its constituent ions in the gas phase.
Lattice enthalpy of dissociation
Enthalpy change when one mole of a solid ionic compound is broken up into its constituent ions in the gas phase.
Enthalpy of vaporisation
Enthalpy change when one mole of a liquid is turned into a gas.
Enthalpy of fusion
Enthalpy change when one mole of a solid is turned into a liquid.
Entropy
A measure of the amount of disorder in a system.
Free energy change
A measure which links enthalpy and entropy changes to predict whether a reaction is feasible.
