#3 - Announcements: There is one Practice and two Homework...

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Unformatted text preview: Announcements: There is one Practice and two Homework Assignments on ARIS (Chapter 9). Watch for new assignments and announcements on ARIS. Problems with the Clickers (people not registered yet; damaged results from the computer crash). Read in advance for Thursday from Chapter 10 (Valence Bond Theory and Molecular Orbital Theory). Lecture Notes on WebCT. The last lectures coverage: Polarity of the bond, electronegativity and the dipole moment (9.2, 9.4, 10.2) Writing Lewis structures (9.6) Putting formal charges on the Lewis structures (9.7) Resonance Lewis structures (9.8) Exceptions to the Octet rule (9.9) (skipping 9.10) Objectives for today: Molecular geometry by VSEPR (10.1) Dipole moments of simple and complex molecules (10.2) Forms of carbon : 10.1 Valence shell electron pair repulsion (VSEPR) model: Predict the geometry of the molecule from the electrostatic repulsions between the electron (bonding and nonbonding) pairs. Electron (bonding and nonbonding pairs) Electron-domains Single/multiple bonds are treated equivalent Valence shell electron pair repulsion (VSEPR) model: Predict the geometry of the molecule from the electrostatic repulsions between the electron (bonding and nonbonding) pairs. The best arrangement of a given number of electron-domains is the one that minimizes the repulsions among them. Molecular Geometry: The electron-domain geometry is often not the molecular geometry The molecular geometry is based on the relative positions of the atoms only , without the lone pairs! 10.110....
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This note was uploaded on 10/21/2010 for the course CHEM 155 taught by Professor Burnett,joe during the Fall '08 term at Iowa State.

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#3 - Announcements: There is one Practice and two Homework...

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