Lec-19-Chap-09-1

Lec-19-Chap-09-1 - CHE 131 Lecture 19, 3/5/2007 Lecture 19,...

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CHE 131 Lecture 19, 3/5/2007 1 Lecture 19 Working with Molecular Models (9.1) Predicting Molecular Shapes: VSEPR (9.2) Benjamin S. Hsiao Department of Chemistry Stony Brook University Lecture 19, Knowledge and Skills • Be aware of some of the limitations of molecular models • Predict the structures of simple molecules using the VSEPR model • Know the basic geometries of the arrangement of electron pairs about central atoms • Estimate the relative spatial demands of different types of electron pairs lone pairs, bonding pairs, single bonds, multiple bonds, bonds involving elements of different electronegativity Molecular Models The Water Molecule Fig. 9-18, p.410
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CHE 131 Lecture 19, 3/5/2007 2 Fig. 9-2, p.385 p.394a Perspective Structure p.390a Determine and represent the structure of a (simple) molecule Molecular structure (trigonal pyramidal) Model of molecular structure
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CHE 131 Lecture 19, 3/5/2007 3 VSEPR, Valence Shell Electron Pair Repulsion Electrons in molecules are organized in pairs. Types of electron pairs: Bonding electron pairs (BP) Single or combined into multiple bonds Lone electron pairs (LP) Electron pairs repel each other. They move away from each other as far as possible.
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Lec-19-Chap-09-1 - CHE 131 Lecture 19, 3/5/2007 Lecture 19,...

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