AQA A2 Chemistry Enthalpy and Entropy Definitions 0.0 / 5 ? ChemistryEnthalpyEntropyA2/A-levelAQA Created by: AlexFinchamCreated on: 28-02-16 15:48 Enthalpy Change A mesure of the heat energy change at constant pressure 1 of 12 Standard Enthalpy of Formation Enthalpy change when one mole of compound is formed from its elements in their standard states under standard conditions 2 of 12 Standard Enthalpy of Combustion Enthalpy change at constant pressure when one mole of substance is burned completely in oxygen in their standard states under standard conditions 3 of 12 Bond Dissociation Enthalpy Enthalpy change at constant pressure requires to break one mole of gaseous bonds to form gaseous atoms 4 of 12 Enthalpy of Lattice Dissociation The enthalpy change when one mole of an ionic solid is seperated into its gaseous ions 5 of 12 Enthalpy of Lattice Formation The enthalpy change when one mole of an ionic solid is formed from its gaseous ions 6 of 12 Enthalpy of Atomisation / Sublimation The enthalpy change when one mole of gaseous atoms are formed from an element 7 of 12 Enthalpy of Dissociation The enthalpy change when one mole of gaseous bonds are broken to form one mole of gaseous element 8 of 12 Enthalpy of First Ionisation Energy The enthalphy change when one mole of gaseous atoms have the highest energy electrons removed to form one mole of gaseous ions 9 of 12 Enthalpy of Electron Affinity The enthalpy change when one mole of gaseous atoms gain electrons to become gaseous anions, each with a single negative charge 10 of 12 Enthalpy of Solution The enthalpy change when one mole of an ionic compound dissolves in excess water 11 of 12 Enthalpy of Hydration The energy released when a gaseous ion is dissolved in water 12 of 12
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