lect02 - : (there are several others) (1) Count total # of...

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CH 310M/318M – TTh 8am – Lecture 2 – Th 1/25/2007 Reading Assignment : Continue reviewing the material in Chapter 1 Textbook Problems : 1.24, 1.25, 1.26, 1.28, 1.29, 1.30, 1.31, 1.34, 1.35, 1.59 Graded Homework : HW#01 has been posted. Deadline = 3:00 p.m. Monday, 1/29 HW#02 has been posted. Deadline = 3:00 p.m. Thursday, 2/1 Last Time : Overview of course What is organic chemistry??? Review of concepts from general chemistry – Lewis structures Today : Review of concepts from general chemistry (continued…) Lewis structures (continued…) VSEPR theory and molecular geometry The first (optional) discussion session will be held TODAY (4:30 to 5:45 p.m. in WEL 1.316)
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An approach to writing Lewis structures
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Unformatted text preview: : (there are several others) (1) Count total # of valence electrons contributed by all atoms. Add 1 e for each negative charge. Subtract 1 e for each positive charge. (2) Make connections between atoms with single bonds. Central atom is usually first in molecular formula. You will be told connections for more complicated molecules. (3) Use remaining electrons to complete octets around outer atoms. (4) If electrons still remain unused at this stage, place them as lone pairs around the central atom. (5) If no electrons remain after Step 3 and the central atom does not have an octet, shift lone pairs from outer atoms to make multiple bonds....
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lect02 - : (there are several others) (1) Count total # of...

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