lect04 - Please take a look at them!!! Factors to consider...

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CH 310M/318M – TTh 8am – Lecture 4 – Th 2/1/2007 Reading Assignment : Sections 1.3, 2.1, 2.2, 2.3 Textbook Problems : 1.55 through 1.58, 1.66, 1.67, 1.68 Graded Homework : HW#02 deadline = 3:00 p.m. TODAY!!! HW#03 has been posted. Deadline = 3:00 p.m. Monday, 2/5 HW#04 will be posted later tonight. Deadline = 3:00 p.m. Thu. 2/8 Last Time : Review of concepts from general chemistry (continued…) VSEPR theory and molecular geometry Resonance Please submit conflict exam requests & SSD accommodation letters this week!! (Deadline = 5:00 p.m. on Friday, 2/2) Today : Review of concepts from general chemistry (continued…) Resonance (continued…) Valence bond theory and hybridization Two new online handouts (related to functional groups) have been posted.
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Unformatted text preview: Please take a look at them!!! Factors to consider in judging relative importance of nonequivalent resonance structures : (1) Remember, only electrons move, not atomic nuclei!!! (2) Structures in which all atoms have octets are usually more important than those where the octet rule is not satisfied for all atoms. (4) Relative importance of non-octet structures increases with increasing electronegativity difference between atoms. In such cases it is generally better to place negative formal charges on more electronegative atoms, and positive formal charges on less electronegative atoms. (3) All else being equal, structures with minimum formal charges are relatively more important....
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This note was uploaded on 07/16/2008 for the course CH 310M taught by Professor Iverson during the Spring '05 term at University of Texas at Austin.

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lect04 - Please take a look at them!!! Factors to consider...

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