handout_L20_VESPR - Lecture 20: VESPR Reading: Zumdahl...

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Lecture 20: VESPR • Reading: Zumdahl 13.13 • Outline – Concept behind VESPR – Molecular geometries VESPR Background • Recall from last lecture that we had two types of electron pairs: bonding and lone. • The Lewis Dot Structure approach provided some insight into molecular structure in terms of bonding, but what about geometry? • Valence Electron Shell Pair Repulsion (VESPR). 3D structure is determined by minimizing repulsion of electron pairs. VESPR Background (cont.) • Example: CH 4 • Must consider both bonding and lone pairs in minimizing repulsion. H C H H H Lewis Structure VESPR Structure VESPR Background (cont.) • Example: NH 3 (both bonding and lone pairs). Lewis Structure VESPR Structure H N H H VESPR Applications • The previous examples illustrate the stratgey for applying VESPR to predict molecular structure: 1. Construct the Lewis Dot Structure 2. Arranging bonding/lone electron pairs in space such that repultionsare minimized. VESPR Applications
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This note was uploaded on 01/18/2012 for the course CHEM 152A taught by Professor Chiu during the Winter '12 term at University of Washington.

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handout_L20_VESPR - Lecture 20: VESPR Reading: Zumdahl...

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