105a_Parr_Practice Exam 4 key

105a_Parr_Practice Exam 4 key - Chemistry 105 A Exam 4...

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1 Chemistry 105 A PLEASE PRINT YOUR NAME IN BLOCK LETTERS Exam 4 Name: __________________________________ 04/22/08 Last 4 Digits of USC ID:____ ____ ____ ____ Dr. Jessica Parr Lab TA’s Name: _________________________________ Lab: W 1 / W 4 / Th 9 / Th 1 / Th 4 Please circle lab section above . Question Points Score Grader 1 12 2 20 3 18 4 8 5 12 6 10 7 10 8 10 Total 100 Please Sign Below: I certify that I have observed all the rules of Academic Integrity while taking this examination. Signature: _______________________________________________________________ Instructions: 1. You must show work to receive credit. 2. If necessary, please continue your solutions on the back of the preceding page (facing you). 3. YOU MUST use black or blue ink. (No pencil, no whiteout, no erasable ink.) 4. There are 8 problems on 10 pages. Please count them before you begin. A periodic table and some useful equations can be found on the last page. 5. Good luck!! =) First Letter of last Name
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2 1. (12 pt) The molecule shown here is 2-furylmethanethiol and is responsible for the odor of coffee. Answer the following questions about 2-furylmethanethiol. CC C O S H H H H H H 1 2 4 3 a. How many lone pairs are on the oxygen? _________ b. How many lone pairs are on the sulfur? _________ c. What is the formal charge on the oxygen? _________ d. What is the formal charge on the sulfur? _________ e. Give the approximate values for the angles labeled 1, 2, 3, and 4 1: 2: 3: 4: f. Which is the most electronegative atom in the molecule? _________ g. How many sigma bonds are there? _________ h. How many pi bonds are there? _________ i. Is the molecule as a whole polar or non-polar? __________________
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This note was uploaded on 07/14/2008 for the course CHEM 105A taught by Professor Bau during the Summer '04 term at USC.

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105a_Parr_Practice Exam 4 key - Chemistry 105 A Exam 4...

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