#4 - Announcements: Watch out for new Homework Assignments...

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Announcements: Watch out for new Homework Assignments on ARIS (Chapter 10). Problems with the Clickers (people not registered yet; damaged results from the computer crash). Lecture Notes on WebCT. The last lectures coverage: Molecular geometry by VSEPR (10.1) Dipole moments of simple and complex molecules (10.2) Objectives for today: Valence Bond Theory and Hybridization (10.3, 10.4, 10.5) Experimental demonstration of the paramagnetic property of liquid oxygen. Molecular Orbital Theory and Delocalization (10.6, 10.7, 10.8) Bond Dissociation Energy Bond Length H 2 F 2 436.4 kJ/mole 150.6 kJ/mole 74 pm 142 pm Valence Bond Theory bonds are formed by sharing of e- from overlapping atomic orbitals. Overlap Of 2 1s 2 2p How does Lewis theory explain the bonds in H 2 and F 2 ? Sharing of two electrons between the two atoms. 10.3 Molecular Orbital Theory formation of molecular orbitals from atomic orbitals. Covalent Bonding and Electrostatic Interaction 10.4 In covalent bonds atoms share electrons. There are several electrostatic interactions in these bonds: 1. Attractions between electrons and nuclei 2. Repulsions between electrons 3. Repulsions between nuclei 10.3 Valence Bond Theory: Change in Potential Energy of Two Hydrogen Atoms as a Function of Their Distance of Separation Change in electron density as two hydrogen atoms approach each other. Valence Bond Theory and Overlap 10.4 We think of covalent bonds forming through the sharing of electrons by adjacent atoms. In such an approach this can only occur when orbitals on the two atoms overlap. Valence Bond Theory and NH 3 N 1s 2 2s 2 2p 3 3 H 1s 1 If the bonds form from overlap of 3 2p orbitals on nitrogen...
View Full Document

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.

Page1 / 82

#4 - Announcements: Watch out for new Homework Assignments...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online