Physical II Flashcards
(9 cards)
Define lattice enthalpy
the enthalpy change due to the formation of 1 mole of ionic lattice from gaseous ions.
Define standard enthalpy change of formation
Energy change when 1 mole of a compound is formed from its elements in their standard states.
Define standard enthalpy change of atomisation
the enthalpy change by forming of 1 mole of gaseous atoms from the element in its standard state under standard conditions.
Define first ionisation energy
the enthalpy change required to remove one electron from each atom in 1 mole of gaseous atoms to form one mole of +1 gaseous ions.
Define first electron affinity
the enthalpy change when an electron is added to each atom in 1 mole of gaseous atoms to form one mole of –1 gaseous ions.
Enthalpy change
heat energy change at constant pressure
enthalpy change of combustion
Energy released when 1 mole of a substance is burned completely in oxygen.
gibbs formula
ΔG=ΔH−TΔS
when is a reaction feasible?
ΔG<0: Reaction is feasible.
ΔG>0: Reaction is not feasible.
