Enthalpy definitions 0.0 / 5 ? ChemistryEnthalpyASEdexcel Created by: stefanieayresCreated on: 27-02-15 09:31 Positive Enthalpy The reaction takes in energy, it is endothermic 1 of 9 Negative enthalpy The reaction gives out energy, it is exothermic 2 of 9 Standard enthalpy of formation The enthalpy change when one mole of a compound is formed in its standard state from its elements in their standard states 3 of 9 Standard enthalpy of combustion The enthalpy change when one mole of a substance undergoes complete combustion in its standard state 4 of 9 Standard enthalpy of atomisation The enthalpy change when one mole of gaseous atoms is formed from an element in its standard state 5 of 9 Bond (disassociation) enthalpy The energy required to break one mole of gaseous bonds to form gaseous atoms 6 of 9 Lattice dissociation enthalpy The enthalpy change when one mole of an ionic lattice dissociates into isolated gaseous ions 7 of 9 Lattice formation enthalpy The enthalpy change when one mole of an ionic lattice is formed from its isolated gaseous ions 8 of 9 Hess's Law The enthalpy change of a reaction is independent of the path taken 9 of 9
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