CHM 2353 Lecture Notes - Lecture 12: Nonmetal, Ionic Bonding, Conjugate Acid
20 Nov 2017
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Document Summary
Lattice energy: energy required to separate 1 mol of ionic solid into gaseous ions, measure of the strength of ionic bond. Coulo(cid:373)(cid:271)"s law: electrostatic energy (cation charge x anion charge) / (cation radius + anion radius) Ion pairs: when ionic compound is vapourized, ionic lattice is converted to ion pairs (interionic attraction is strong) Finding lattice energies: born-haber cycle: calculate lattice e w/ born-ha(cid:271)er (cid:272)y(cid:272)les (cid:894)hess" law(cid:895, lattice e = enthalpy of formation vaporization enthalpy & ionization enthalpy. Molecular: discrete molecular units, properties depend on polarity & polarizability of molecules, nonpolar compounds. Gases, sometimes liquid, at rt; low mp & bp. Soluble in non-polar solvents (like dissolves like: polar compounds. Gases, liquids, or solids at rt; low to mid mp & bp. Soluble in some polar & some non-polar solvents: h-bonded compounds. Usually liquid or solid at rt; low to mid mp & bp. Soluble in some h-bonded & some polar solvents.
