Definitions Unit 5 0.0 / 5 ? ChemistryEnergetics, Redox and Inorganic ChemistryA2/A-levelAQA Created by: nadieyouCreated on: 12-02-15 09:49 Enthalpy of atomisation Enthalpy change that accompanies the formation of one mole of gaseous atoms from the element in its standard state. 1 of 23 Mean Bond Enthalpy Enthalpy needed to break one mole of gaseous covalent bonds averaged over a range of compounds. 2 of 23 Bond enthalpy Enthalpy needed to break one mole of gaseous covalent bonds to form two moles of gaseous atoms. 3 of 23 Enthalpy lattice of formation Enthalpy change when one mole of an ionic solid is formed from its constituent gaseous ions. 4 of 23 Enthalpy lattice dissociation Enthalpy change when one mole of a solid ionic lattice is separated into gaseous ions. 5 of 23 Electron affinity Enthalpy change when one mole of gaseous atoms form one mole of gaseous negative ions. 6 of 23 Enthalpy of solution Enthalpy change when 1 mole of solute dissolves in sufficient solvent that no further enthalpy change occurs on further dilution. 7 of 23 Enthalpy of Hydration Enthalpy change when 1 mole of aqueous ions is formed from gaseous ions. 8 of 23 Feasible/Spontaneous A reaction that is possible because (Gibbs free energy) 9 of 23 Perfect ionic model Ions can be regarded as perfect spheres, Only electrostatic attraction. 10 of 23 Standard conditions 298K, 100kPa and all solutions at 1.00 moldm-3 11 of 23 Electrochemical series A list of reduction half-equations in order of increasing or decreasing electrode potential. 12 of 23 Periodicity A trend in properties of the elements across a period, repeated across the next period. 13 of 23 Hydrolysis Splitting up of molecules by using water. 14 of 23 Complex A central metal ion surrounded by co-ordinately bonded ligands. 15 of 23 Ligand A species that can donate one or more lone pairs of electrons. 16 of 23 Co-ordination number Number of co-ordinate bonds formed in a complex (not just the number of ligands). 17 of 23 Bidentate Ligand Has two lone pair donor atoms. 18 of 23 Active site Place where reactants are adsorbed and where reaction occurs. 19 of 23 Heterogeneous catalyst A catalyst that is in a different state to the reactants. 20 of 23 Homogeneous catalyst A catalyst that is in the same state as the reactants. 21 of 23 Lewis acid Lone pair acceptor 22 of 23 Lewis base Lone pair donor 23 of 23
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