3.1.8 Thermodynamics Flashcards
Define enthalpy of combustion.
Energy change when one mole of a substance completely burns in oxygen, all reactants in
products in their standard states.
Define enthalpy of formation.
Energy change when one mole of a compound is formed from its constituent elements in their standard states.
Define ionisation energy.
Energy change when one mole of gaseous atoms loses one mole of electrons to form one mole of unipositive ions.
Define electron affinity.
Energy change when one mole of electrons is gained by one mole of gaseous atoms to produce one mole of singly charged ions.
Define atomisation.
Energy change when one mole of gaseous atoms is formed from an element in its standard states.
Define mean bond enthalpy.
Energy change when one mole of covalent bonds in a gaseous substance is broken averaged over a range of similar compounds.
Define lattice enthalpy (formation).
Energy change when one mole of a crystalline compound is formed from gaseous ions scattered an infinite distance apart.
Define lattice enthalpy (dissociation).
Energy change when one mole of a lattice is broken up to produce gaseous ions an infinite distance apart.
