1st hour exam

1st hour exam - CHEM 3311, Professor Zhang, Spring 2010...

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CHEM 3311, Professor Zhang, Spring 2010 First hour exam, Feb 11, 2010 Printed Name: Student ID: . Scores: 1) 2) 3) 4) 5) 6) . This is a closed-book exam. The use of notes, models, calculators, scratch paper will not be allowed during the exam. Please put all your answers on the test. Use the backs of the pages for scratch.
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1) (16 pts) For each of the following molecules: 1. Draw a valid valence bond structure, showing all formal charges and unshared electrons. (12pts) 2. Indicate which type of hybridization of each second row atom (with atomic number 3- 10) in your structures.(4pts) a. (CH 3 ) b. (CH 3 ) c. (BCl 4 ) d. (CH 3 NH 3 ) 2) (12pts) Resonance structure A. Draw the most important resonance structure for the molecule shown below. Show all arrows required to go from one resonance structure to the other ( both structures should have arrows) (6pts). B. For the molecule shown in 2A above, how much negative charge resides on each oxygen (O1, O2 and O3, give your answer in percentage negative charge on each oxygen)? (6pts) charge on O1 % charge on O2 % charge on O3 % S O O O H 3 C 1 2 3 Page 2/6
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This note was uploaded on 10/30/2011 for the course CHEM 3311 taught by Professor K.peters during the Spring '07 term at Colorado.

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1st hour exam - CHEM 3311, Professor Zhang, Spring 2010...

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