CHEM 112 Chapter Notes - Chapter 10.7 and 11.3-11.4: Trigonal Bipyramidal Molecular Geometry, Trigonal Planar Molecular Geometry, Chemical Polarity

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7 Dec 2016
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The lewis structure for water gives the impression that the constituent atoms are arranged in a straight line. However the molecule is not linear, it is bent. To have a complete description of the shape of a molecule, we must determine the bond lengths, distances between nuclei of bonded atoms and the bond angles. Triatomic molecules can be angular, bent or v-shaped. The shape of a molecule is established by experiment or by a quantum mechanical calculation. Electron pairs repel each other whether they are in chemical bonds or lone pairs, electron pairs assume orientations about an atom to minimize repulsions. Ordinary lines are used to represent bonds that lie in the plane of the paper. Solid wedges are used to represent bonds that point toward the viewer, in front of the plane of the paper. Dashed wedges are used to represent bonds that point away from the viewer, behind the plane of the paper.

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