lecture 3 - can be achieved upon adoption of tetrahedral...

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318M – Krische, Lecture 3: W - 09/3/03, Ch. 1, Covalent Bonding and Shapes of Molecules To assess the geometry of the atoms present in a molecule, we take advantage of Valence Shell Electron Pair Repulsion (VSEPR) Theory. VSEPR is simply a model for predicting the geometry of the atoms present in a molecule predicated on the minimization of electron-electron repulsion. We began by considering methane CH 4 . The central carbon of methane is surrounded by four bonding pairs of electrons. These define four regions of electron density. In order to minimize electron-electron repulsion between these groups, they will want to be as far apart from one another as possible. This
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Unformatted text preview: can be achieved upon adoption of tetrahedral geometry, i.e. the central carbon is at the center of a tetrahedron and the hydrogens reside at the vertices of the tetrahedron. All H-C-H dihedral angles are 109 degrees. • We then applied VSEPR Theory to methyl anion, ammonia and water. Using VSEPR theory we were able to understand the distorted tetrahedral geometry of these molecules by understanding that bond pair/bond pair repulsion is less severe than bond pair/lone pair repulsion, and that bond pair/lone pair repulsion is less severe than lone pair/lone pair repulsion....
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This note was uploaded on 02/09/2009 for the course CH 318M taught by Professor Bocknack during the Fall '08 term at University of Texas.

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