CHM 2045 Lecture Notes - Lecture 8: Enthalpy, Electron Affinity, Lattice Energy
28 Feb 2017
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Clicker question: which will have the largest lattice energy: cao, cacl2, nacl, na2o, mgo, mgcl2. The energy released during the formation of an ionic bond: mg2+ + o2- mgo. Charge and distance between the nuclei of two ions. Lattice energy= (charge of atom 1 * charge of atom 2)/distance. We look at the charges and eliminate smaller charges: charges are determined by multiplying the charges of each element. It can not be measured in real-life, so we use the born-haber. Cycle: energy of sublimation is from going from solid to gas, ionization is the removal of an electron, electron affinity is the addition of an electron. Bond energy is the energy required to break apart an atom. (endothermic: ex. A bond is two electrons that are being shared. Clicker question: which bond will be the strongest: o double bonded to o. Delta h rxn = sum of bonds broken sum of moles formed.
