midterm-2004-2005

midterm-2004-2005 - Problems Set of Mid-term Exam, CHEM...

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Problems Set of Mid-term Exam, CHEM 111, Fall 2004/05 1 CHEM 111 Organic Chemistry I MID-TERM EXAMINATION (Fall Semester, 16 October 2004) Instructor: Dr. Wei-Min Dai Problems Set Note : This is a close-book examination. You are required to complete ALL problems independently. The maximum time is 80 minutes. You can work on the problems in any order you like. Start with the easy problems first and do the hard ones later. Use the Examination Booklet to present your answers. Do not forget to write down your name, student ID number, course title, and date on your Examination Booklet. Insert this problems set into your used Examination Booklet and hand in before leaving the examination room. Total marks are 350 points. 1. Multiple choice problems. Pick up only ONE answer and write it down on the answering booklet. (8 points each; 64 points) (1a) Which of the following are correct Lewis structures, including formal charges, for nitric acid, HNO 3 ? a HN O O b O ON O O O O c H H (1b) Which of the following choices represent(s) a pair of resonance structures? a CH 3 CH 2 C O H CH 3 CH C OH H , b CH 3 CH OCH 3 CH 3 CH OCH 3 , c C CN CCN , H H H H (1c) According to the given p K a values, select the weakest acid. p K a: HF (3.45), HCl (–7), HCN (9.31), HNO 3 (–1.3) A. HCl B. HF C. HNO 3 D. HCN (1d) The rate of a reaction typically increases as the temperature increases because: A. The molecules make more collisions with the wall of the reaction vessel. B. The activation energy decreases. C. The activation energy increases. D. The fraction of molecules with kinetic energy greater than G increases. Name: ID#: A. a B. b C. c D. a , b , and c A. a only B. a and c C. b and c D. a , b , and c
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Problems Set of Mid-term Exam, CHEM 111, Fall 2004/05 2 (1e) Which pair of the following conformations has the same energy? Energy costs (in kJ/mol) for interactions in alkane conformers: H H eclipsed = 4.0 H CH 3 eclipsed = 6.0 CH 3 CH 3 eclipsed = 11 CH 3 CH 3 gauche = 3.8 CH 3 H 3 C H CH 3 H H 3 C CH 3 H 3 C H H CH 3 H 3 C CH 3 H 3 C H H H 3 C H 3 C CH 3 H 3 C H
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This note was uploaded on 02/27/2010 for the course CHEM CHEM111 taught by Professor Dai during the Fall '06 term at HKUST.

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midterm-2004-2005 - Problems Set of Mid-term Exam, CHEM...

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