09092009 - CH 310M/318M MWF 12:00 Lecture 6 W Reading...

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CH 310M/318M – MWF 12:00 – Lecture 6 – W 9/9/2009 Reading Assignment : Sections 2.1, 2.2 Textbook Problems : 1.15, 1.56-1.59, 1.71-1.73 Graded Homework : HW#03 deadline = 3:00 p.m. on Thu 9/10 HW#04 deadline = 3:00 p.m. on Mon 9/14 Last Time : Polar and nonpolar molecules – another example Resonance Today : Judging relative importance of nonequivalent resonance structures If you have an excusable conflict for ANY of the three midterm exams, the deadline to sign up to take a conflict exam is 5:00 p.m. on Friday, September 11 . REMINDER : The optional TA discussion sessions started yesterday. Please see Blackboard for the complete schedule!!! Valence bond theory and hybridization
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Factors to consider in judging relative importance of nonequivalent resonance structures : Remember, only electrons move, not atomic nuclei!!! (1)Structures in which all atoms have octets are usually more important than those where the octet rule is not satisfied for all atoms.
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