Thermodynamics - Enthalpy definitions 0.0 / 5 ? ChemistryEnthalpyA2/A-levelAQA Created by: kakeface45Created on: 03-05-18 13:08 Enthalpy Change of formation Elements in standard states and standard conditions -> 1 mol of compound 1 of 12 Atomisation of an element Element in standard state -> 1 mole of gaseous atoms (e.g. ½Cl2 (g)-> Cl (g) 2 of 12 First ionisation energy 1 mole of gaseous atoms -> 1 mol of gaseous 1+ ions 3 of 12 Second ionisation energy 1 mol of gaseious 1+ ions -> 1 mol of gaseous 2+ ions 4 of 12 First electron affinity 1 mol of gaseous atoms -> 1 mol of gaseous 1- ions 5 of 12 Enthalpy change of hydration 1 mol of gaseous ions -> 1 mol of aqueous ions. 6 of 12 Bond dissociation enthalpy When all the bonds of the same type in 1 mol of gaseous molecules are broken 7 of 12 Atomisation of a compound 1 mol of a compound in its standard state is converted into gaseous atoms. 8 of 12 Second electron affinity When 1 mol of gaseous 1- ions forms 1 mol of gaseous 2- ions 9 of 12 Enthalpy change of solution When 1 mol of solute is dissolved in enough solvent so that no further enthalpy change happens when more solvent is added. E.g. NaCl (g) -> NaCl (aq) 10 of 12 Lattice enthalpy of formation gaseous ions under standard condition--> 1 mol of a solid ionic compound 11 of 12 Lattice enthalpy of dissociation 1 mole of a solid ionic compound-> constituent gaseous ions under standard conditions 12 of 12
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