11-16-11 - Chemistry 1A F11 11.16.11 Dr. Shaka Molecular...

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254 Chemistry 1A F11 11.16.11 Dr. Shaka Course Code 40000 Molecular Geometry The shapes of molecules influence their other properties: melting point, vapor pressure, viscosity, reactivity, and so on. We have a very simple model to predict the molecular geometry given a correct Lewis structure: the Valence Shell Electron Pair Repulsion (VSEPR) model. We just assume that electron pairs repel each other, and so arrange in space to be as far apart as possible.
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255 Chemistry 1A F11 11.16.11 Dr. Shaka Course Code 40000 Molecular Geometry The geometry in 3D space then just depends on how many electron pairs are surrounding a given atom. However, for the purposes of counting, we ignore multiple bonds. It’s as if the geometry were set by the arrangement of the single bonds that hold the atoms together, and the addition of multiple bonds to satisfy the octet rule doesn’t make any difference.
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256 Chemistry 1A F11 11.16.11 Dr. Shaka Course Code 40000 Molecular Geometry VSEPR is important to rationalize bond angles and other structural features of
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11-16-11 - Chemistry 1A F11 11.16.11 Dr. Shaka Molecular...

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