Topic2+Set+A - What we represent, when we draw a molecule,...

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T OPIC 2 (S LIDES S ET A) S TRUCTURE AND BONDING MODELS FOR COVALENT P - BLOCK ELEMENTS , CHEM 1311, S PRING 2010 Dr. Charlie Cox “ What we represent, when we draw a molecule, is what we want to represent: we abstract a piece of reality to show it to another person." Roald Hoffmann 1
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R EFERENCES Rayner-Canham: 3.6 – 3.9, 8.1 – 8.5 Winter: 2.1-2.5 (p. 27 – 30) Norman: 7 (p. 83 – 90) Review Materials, Chemical Bonding, Uploaded to T-Square 2
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O BJECTIVES Describe basic differences between covalent and ionic structures and how these structures form. Use Lewis structures to depict covalent molecules with an emphasis on formal charges as a way to support the conclusions drawn from these structures. Discuss VSEPR to describe geometry/shape of covalent structures. Utilize hybridization and MO theory to fine tune covalent bonding models. 3
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F UNDAMENTAL B ONDING M ODELS Ionic and Covalent Bonding 4
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B ONDING IS NOT ALWAYS UNAMBIGUOUS! 5
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L EWIS S TRUCTURES Lewis, G.N. J. Am. Chem. Soc . 1916, 38 , 762 Definitions/Representations: a. A dot represents an electron . a. A pair of electrons between neighboring atoms is a bond (either ionic or covalent) c. A pair of electrons that is not shared with another atom is a lone pair . d. The octet rule ???? 6
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E XAMPLES a. OCl 2 b . NO 2 - c . SO 3 2- 7
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FORMAL CHARGE Sulfite, SO 3 2- Formal Charge = V – L – ½ P 8
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ASES WITH MULTIPLE R ESONANCE F ORMS [CON] - Predicting Stability 1. The structure with the fewest charges. 2. Like charges cannot be side by side (repulsion).
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Topic2+Set+A - What we represent, when we draw a molecule,...

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