Fall2006 Exam1 - Last Name: First Name: UTEID: CH 310M/318M...

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DO ALL QUESTIONS!!! BEST OF LUCK!!! Last Name: First Name: CH 310M/318M Fall 2006 Dr. Brian M. Bocknack Midterm Exam #1 Thursday, September 28, 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 UTEID 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 do use a pen, only blue or black ink is acceptable. Answers written in red ink will not be graded. Be prepared to show your valid UT ID card to a proctor when attendance is taken, and also when you turn in your exam. You may not leave the exam room for any reason until you turn in your exam. Once you turn in your exam and leave the exam room, you will not be allowed to return!!! Page Page Page 2 (15) 6 (30) 10 (40) 3 (15) 7 (30) 11 (20) 4 (30) 8 (36) 12 (20) 5 (40) 9 (24) Total (300) Including this cover page, 2 blank pages (scratch paper), and the last page, which contains a periodic table, this exam contains 15 pages. Please feel free to tear off the scratch paper and the periodic table to use as you work through the exam. UTEID :
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UTEID: 2 1. (Problem worth 30 points; each part worth 5 points) PLEASE READ THIS QUESTION VERY CAREFULLY !!! 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) Consider the two structures shown below. All lone pairs and nonzero formal charges are shown explicitly in each structure. Which choice best describes the relationship between these structures? A. The structures are equivalent resonance structures B. The structures are nonequivalent resonance structures C. The structures represent constitutional isomers D. None of the above. There is no clear relationship between these structures. (b) Consider the following condensed structural formula: (CH 3 ) 2 CHCH 2 CH 2 C(CH 3 ) 3 Which line-angle structure correctly represents the structure of this molecule? (c) Consider the line-angle structure shown below. Which choice gives the correct molecular formula of this compound? Problem #1 continues on Page 3… A C 8 H 15 NO B C 9 H 19 NO C C 9 H 20 NO D C 9 H 17 NO Page Total O N CH 2 H 3 C CH 3 N O H 2 C A B C D N H O
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UTEID: 3 Please follow the instructions given at the top of Page 2!!! In lecture, we constructed the molecular orbital energy diagram for O 2 . The bonding in other second period diatomic molecules can also be described using the same kind of MO diagram. You’ll need to refer to the MO diagram given below to answer parts (d), (e), and (f). Note that this MO diagram has already been filled in with electrons! (d) Which molecular formula listed below is consistent
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Fall2006 Exam1 - Last Name: First Name: UTEID: CH 310M/318M...

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