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310MSp06MidtermExam1Key

310MSp06MidtermExam1Key - Last Name First Name CH 310M/318M...

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Last Name: First Name: CH 310M/318M TTh 8:00 9:30 (52810/53030) Spring 2006 Dr. Brian M. Bocknack Midterm Exam #1 – Answer Key Wednesday, February 15, 2006 7:00–9:00 p.m. Do not open this exam booklet until you are told to do so! This exam is closed book, meaning no books, notes, calculators, or molecular models are allowed. PLEASE WRITE YOUR NAME AT THE TOP OF EACH PAGE !!! Exams written in pencil are not eligible for regrades. Answers written in pencil with ink overlay will not be graded. If you use a pen, only blue or black ink is acceptable. Be prepared to show your valid UT ID card to a proctor when attendance is taken, and when you turn in your exam. Page Page Page 2 (20) 7 (18) 12 (20) 3 (15) 8 (36) 13 (32) 4 (30) 9 (15) 14 (24) 5 (20) 10 (12) 15 (18) 6 (10) 11 (20) 16 (10) Total (300) Including this cover page, 2 blank pages (scratch paper), and the last page, which contains a periodic table (including electronegativity values), this exam contains 19 pages. DO ALL QUESTIONS BEST OF LUCK!!!
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Last Name: First Name: 2 1. (Problem worth 35 points; each part worth 5 points) In each part below, choose the best answer. Write the letter that corresponds to your choice in the box. There should only be one letter in each box. In other words, each question has one choice that is “best.” (a) Which choice below represents the ground state (i.e. lowest energy) electron configuration of a neutral silicon atom (atomic symbol = Si)? A. 1s 2 2s 2 2p x 2 2p y 2 2p z 2 3s 2 3p x 2 3p y 0 3p z 0 B. 1s 2 2s 2 2p x 2 2p y 2 2p z 2 3s 1 3p x 1 3p y 1 3p z 1 C. 1s 2 2s 2 2p x 2 2p y 2 2p z 2 3s 2 3p x 1 3p y 1 3p z 0 D. 1s 2 2s 2 2p x 2 2p y 2 2p z 2 3s 3 3p x 1 3p y 0 3p z 0 (b) Based on the definitions presented in lecture, which bond below would be classified as a polar covalent bond ? A. Li–F B. C–S C. Cl–Cl D. C–O E. None of the above (c) A hydrocarbon with 7 carbon atoms also contains 2 rings . How many hydrogen atoms must be present in this compound? A. 11 D. 14 B. 12 E. 15 C. 13 F. 16 (d) Which structure below represents a secondary (2°) alcohol? A B OH C O D OH OH Page Total C D B B
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Last Name: First Name: 3 (e) Consider the line–angle structure of the alkane shown below: Which choice below best describes the part of the molecule that is circled? A. a methyl group is circled B. a methylene group is circled C. a methine group is circled D. a quaternary carbon atom is circled (f) Which of the functional groups listed below does not contain an oxygen atom? A. thiol B. amide C. carboxylic acid D. ether (g) Which picture below represents a π bonding molecular orbital? The “dots” in each diagram represent the nuclei of a diatomic molecule. A B C D Page Total C A C
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Last Name: First Name: 4 2. (Problem worth 30 points, each part worth 6 points) READ THIS QUESTION CAREFULLY !!! In each part of this question, write a Lewis structure for the molecular formula given. Write your answer in the box provided. Be sure to show all lone pairs (as dots) and any nonzero formal charges clearly in each of your structures!
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