BLBCJM-CH9-07

BLBCJM-CH9-07 - Chemistry, The Central Science, 10th...

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Molecular Geometries and Bonding Chapter 9 Molecular Geometries and Bonding Theories Chemistry, The Central Science , 10th edition Theodore L. Brown, H. Eugene LeMay, Jr., and Bruce E. Bursten
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Molecular Geometries and Bonding Molecular Shapes The shape of a molecule plays an important role in its reactivity. By noting the number of bonding and nonbonding electron pairs we can easily predict the shape of the molecule.
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Molecular Geometries and Bonding What Determines the Shape of a Molecule? Simply put, electron pairs, whether they be bonding or nonbonding, repel each other. By assuming the electron pairs are placed as far as possible from each other, we can predict the shape of the molecule.
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Molecular Geometries and Bonding Electron Domains We can refer to the electron pairs as electron domains . In a double or triple bond, all electrons shared between those two atoms are on the same side of the central atom; therefore, they count as one electron domain. This molecule has four electron domains.
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Molecular Geometries and Bonding Valence Shell Electron Pair Repulsion Theory (VSEPR) “The best arrangement of a given number of electron domains is the one that minimizes the repulsions among them.”
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Molecular Geometries and Bonding Electron-Domain Geometries These are the electron-domain geometries for two through six electron domains around a central atom.
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Molecular Geometries and Bonding Electron-Domain Geometries All one must do is count the number of electron domains in the Lewis structure. The geometry will be that which corresponds to that number of electron domains.
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Molecular Geometries and Bonding Molecular Geometries The electron-domain geometry is often not the shape of the molecule, however. The molecular geometry is that defined by the positions of only the atoms in the molecules, not the nonbonding pairs.
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Molecular Geometries and Bonding Molecular Geometries Within each electron domain, then, there might be more than one molecular geometry.
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Molecular Geometries and Bonding Linear Electron Domain In this domain, there is only one molecular geometry: linear. NOTE: If there are only two atoms in the molecule, the molecule will be linear no matter what the electron domain is.
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Molecular Geometries and Bonding Trigonal Planar Electron Domain There are two molecular geometries: Trigonal planar, if all the electron domains are bonding Bent, if one of the domains is a nonbonding pair.
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Geometries and Bonding Nonbonding Pairs and Bond Angle Nonbonding pairs are physically larger than bonding pairs. Therefore, their repulsions are
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This note was uploaded on 08/17/2008 for the course CHE 101 taught by Professor Churchhill during the Spring '08 term at SUNY Buffalo.

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BLBCJM-CH9-07 - Chemistry, The Central Science, 10th...

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