Ch09 MSJ jlm - Chapter 9 Molecular Structures Linus Pauling...

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1 Molecular Structures Molecular Structures Chapter 9 Chapter 9 Linus Pauling 1627-1691.** Defined electronegativity. Wrote “The Nature of the Chemical Bond” 1939. Pioneered crystal and protein structures.
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2 Molecular Shapes Molecular Shapes Lewis structures give atomic connectivity: they tell us which atoms are physically connected to which. Lewis structures do not give us information about geometry or shape of molecules. For example, methane, CH 4 , is drawn as: Where all the angles appear to be 90 o . Actually, the bond angles are 109.5 o , (tetrahedral angle) H C H H H H H C H H
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3 Molecular Shapes Molecular Shapes Methane: Tetrahedral geometry Tetrahedron (sp 3 -hybridization)
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4 Some Molecular Geometries Some Molecular Geometries
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Molecular Shapes Molecular Shapes In order to predict molecular shape, we assume the valence electrons repel each other. Therefore, the molecule adopts whichever 3D geometry minimized this repulsion. This is the idea behind
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This note was uploaded on 04/12/2011 for the course CHEM 1420 taught by Professor Acree during the Spring '08 term at North Texas.

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Ch09 MSJ jlm - Chapter 9 Molecular Structures Linus Pauling...

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