2 - complicated molecules. (3) Use remaining electrons to...

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CH 310M/318M – TTh 8am – Lecture 2 – Th 1/17/2008 http://courses.cm.utexas.edu/bbocknack/ch310m/ (address is case-sensitive) Course Web Site : Reading Assignment : Continue reviewing the material in Chapter 1 Last Time : Overview of course Why is carbon special? Introduction to alkanes Please download a copy of the course syllabus if you did not receive one in class on Tuesday!!! Textbook Problems : 1.24, 1.25, 1.30, 1.31, 1.34, 1.35, 1.37, 1.38 Graded Homework : HW#01 deadline = 3:00 p.m. on Mon 1/28 Today : Constitutional isomers Lewis structures, VSEPR theory and molecular geometry Formal charge and electronegativity
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An approach to writing Lewis structures : (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
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Unformatted text preview: 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. Predicting Molecular Geometry (VSEPR Theory) 3-Dimensional shapes of molecules are extremely important in organic chemistry. In biological systems, the function of a molecule is often determined by its shape. VSEPR stands for V alence S hell E lectron P air R epulsion Like charges repel for this reason, the electron groups around an atom will arrange themselves to be as far apart from one another in space as possible. You should know the preferred geometrical arrangements for 2, 3, and 4 groups of electrons around an atom....
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This note was uploaded on 04/09/2009 for the course BIO 326R taught by Professor Whiteley during the Spring '08 term at University of Texas at Austin.

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2 - complicated molecules. (3) Use remaining electrons to...

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