pract.quiz3takey - CH301 Fall 2010 Practice Quiz 3 Answer...

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CH301 Fall 2010 Practice Quiz 3 Answer Key 1.How many polar ionic, polar covalent and non-polar covalent bonds are present in the Lewis structure for BF 2 BNH 2 ? Base your answer on simple EN considerations. (Hint: the molecule is drawn much as it is written.) 1. 0; 6; 0 2. 0; 3; 3 3. 2; 3; 1 4. 2; 4; 0 5. 0; 5; 1 Based on the simple rule that ǻ EN > 1.5 is ionic, only the two B±F bonds are ionic, for a total of 2. Based on the simple rule that 1.5 > ǻ EN > 0 is polar covalent, the B±N bond and two N±H bonds are polar covalent, for a total of 3. Lastly, any bond between an atom and another of the same atom is non-polar covalent, so the one B±B bond is non-polar covalent, for a total of 1. 2. In the Lewis structure for dimethylamine (CH 3 NHCH 3 ), what are the approximate bond angles, hybridization and electronic geometry of the nitrogen atom? (Hint: the molecule is drawn much as it is written.) 1. 90°, sp 3 , tetrahedral 2. 109.5°, sp 2 , trigonal planar 3. 120°, sp 2 , trigonal planar
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This note was uploaded on 12/05/2010 for the course NATURAL SC 301 taught by Professor Laude during the Spring '10 term at University of Texas at Austin.

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pract.quiz3takey - CH301 Fall 2010 Practice Quiz 3 Answer...

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