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Unformatted text preview: CHM 2046/Myers Worksheet 21 February 26, 2010 1. Working T Shift Effects – Which way is Better? Le Chatelier Reasoning or Using ∆ G° = ∆ H° - T ∆ S° (using ∆ H° only) (using ∆ H° and ∆ S°) It helps to express K in terms of ∆ H° and ∆ S°: K = exp ° ∆- RT G = exp ° ∆ + ° ∆- RT S T H = One gets slightly different answers for the case: ∆ H°= + and ∆ S° = - LCP Reasoning ∆ G° = ∆ H° - T ∆ S° At Low T: At High T: 2. Metal Ion “Q/R” Effects. Metal ions with a large charge (Q), and/or a small radius (R), very strongly bond to Lewis bases. This principle applies to both ion-ion and ion-dipole attractions. One can understand and predict a lot of metal ion chemistry based the Q/R ratio . For this series of ions, Q/R increases from left to right: Na + , Ca +2 , Mg +2 , Al +3 . Q/R (in -1 ) = ____ ____ ____ ____ For this series, chemical properties vary in a regular manner, based on the Q/R....
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- Spring '07