Lecture 29 - Molecular Geomety and VSEPR

Lecture 29 - Molecular Geomety and VSEPR - Nov 7 2011...

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Lec-29: Molecular Geometry - VSEPR Roy A. Lacey, Stony Brook University; Che 131, Fall 2011 1 Molecular Shape ` Molecular shape affects the properties of compounds: ¾ Physical state at any temp ¾ solubility in fluids ¾ chemical reactivity ¾ biological activity ¾ distribution in the environment Being able to understand and predict coordination geometry is very important Roy A. Lacey, Stony Brook University; Che 131, Fall 2011 2 Nov 7, 2011
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Molecular Shape Lewis structures do not provide enough information ` A bond angle is the angle defined by lines to establish the shapes of molecules angle defined by lines joining the centers of two atoms to a third atom to which they atom to which they are covalently bonded. ` The molecular geometry or shape is defined by the lowest energy arrangement of its atoms in three- dimensional space. Roy A. Lacey, Stony Brook University; Che 131, Fall 2011 3 Valence-Shell Electron-Pair Repulsion Theory (VSEPR) The geometric arrangement of atoms bonded to a given atom is determined principally by minimizing electron pair repulsions electron pair repulsions. AX 2 Here Roy A. Lacey, Stony Brook University; Che 131, Fall 2011 4
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Valence-Shell Electron-Pair Repulsion Theory (VSEPR) (1) Electron pairs repel each other and try to remain as far apart from one another as possible. (2) The positions of atoms in space (molecular geometry or configuration about a central atom) is determined by the configuration about a central atom) is determined by the relative positions that electron pairs achieve after taking repulsions into account. (3) The arrangement of pairs about a central atom depends on the number of pairs that exist about the atom.
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Lecture 29 - Molecular Geomety and VSEPR - Nov 7 2011...

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