20071001 Day Lecture 11

20071001 Day Lecture 11 - Todays Plan Welcome to CHM...

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1 Welcome to CHM 1220/1225 Please turn off cell phones pages iPods Thank you! Today’s Plan Announcements Chapter 10 • Pre-lecture Assignment 11 will be available at 2:00 p.m. today and is due by noon, Wednesday, October 3, 2007. • Chapter 10 Quiz is due by noon, Friday, October 5, 2007. • Chapter 10 Homework is due by 12:50 p.m. Friday, October 5, 2007 • Homework Assignments for Chapters 10, 5, 11, and 12 have been posted on Blackboard under Assignments (revised as of this morning). • If you have a question about an exam question or grading, please download the Request for Exam Review form from Blackboard under Course Documents. It is due by 2:00 p.m. Friday, October 5, 2007. No requests will be accepted after that. Chapter 10 Molecular Geometry and Chemical Bonding Theory Molecular Geometry and Chemical Bonding Theory Molecular Geometry and Directional Bonding 1. The Valence-Shell Electron-Pair Repulsion (VSEPR) Model 2. Dipole Moment and Molecular Geometry 3. Valence Bond Theory 4. Description of Multiple Bonding
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2 Molecular Orbital Theory 1. Principles of Molecular Orbital Theory 2. Electron Configurations of Diatomic Molecules of the Second Period 3. Molecular Orbitals and Delocalized Bonding ? Use the VSEPR model to predict the geometries of the following molecules: (a) AsF 3 , (b) PH 4 + , (c) BCl 3 . AsF 3 has 1(5) + 3(7) = 26 valence electrons; As is the central atom. The electron-dot formula is There are four regions of electrons around As: three bonds and one lone pair. The electron regions are arranged tetrahedrally. One of these regions is a lone pair, so the molecular geometry is trigonal pyramidal. As F F F PH 4 + has 1(5) + 4(1) -1 = 8 valence electrons; P is the central atom. The electron-dot formula is There are four regions of electrons around P: four bonding electron pairs.
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20071001 Day Lecture 11 - Todays Plan Welcome to CHM...

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