351mt09 - THE UNIVERSITY OF CALGARY FACULTY OF SCIENCE...

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THE UNIVERSITY OF CALGARY FACULTY OF SCIENCE MIDTERM EXAMINATION CHEMISTRY 351 November 4th, 2009 Time: 2 Hours READ THE INSTRUCTIONS CAREFULLY PLEASE WRITE YOUR NAME , STUDENT I.D. NUMBER ON BOTH YOUR ANSWER BOOKLET AND COMPUTER ANSWER SHEET . The examination consists of Parts 1 - 7, each of which should be attempted. Note that some parts provide you with a choice of questions, e.g . answer 4 out of 5. These will be graded in numerical order until the required number have been graded, regardless of whether they are right or wrong. Parts 1 - 4 will be computer graded, and only Parts 5, 6, and 7 are to be answered in the booklet provided. A periodic table with atomic numbers and atomic weights and spectroscopic data tables are located inside the back cover. Parts 1 - 4 consist of a series of multiple choice questions numbered 1 - 31 which are to be answered on your computer answer sheet. Indicate your answer by blackening out the appropriate space, A, B, C, D or E on the answer sheet. Use a pencil only and not ink . In some cases it is required that you indicate multiple items for a complete and/or correct answer by blackening out more than one space. In some other cases more than five options are available and some of these also require more than one space to be blackened out. For an example, an option specified as AB requires that you blacken out both space A and space B. Part marks may be awarded in some of the questions. Incorrect answers must be erased cleanly . Molecular models are permitted during the exam; calculators are also permitted, but NOT programmable calculators . Absolutely no other electronic devices are allowed. PLEASE WRITE THE NUMBER OF YOUR LABORATORY SECTION AT THE TOP OF THE FRONT COVER ON YOUR ANSWER BOOKLET
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Chem 351 FALL 2009 Cont'd Page 2 of 17 18% PART 1: RELATIVE PROPERTIES ANSWER ANY NINE (9) of questions 1-10 (2 marks per question) Arrange the items in questions 1-10 in DECREASING ORDER ( i.e . greatest, most etc. first ) with respect to the indicated property. Use the following code to indicate your answers. A. i > ii > iii D. ii > iii > i B. i > iii > ii E. iii > i > ii C. ii > i > iii AB. iii > ii > i 1. The relative strengths of the C=O bonds in each of the following molecules: C H 3 C CH 3 O C H 3 C NH 2 O N H 2 C NH 2 O ii i i i i 2. The relative yields of the following products from the light catalysed reaction of Br 2 with 1,1,3-trimethylcyclobutane: Br Br Br i i i i 3. The boiling points of the following : OH i iii
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Chem 351 FALL 2009 Cont'd Page 3 of 17 Use the following code to indicate your answers. A. i > ii > iii D. ii > iii > i B. i > iii > ii E. iii > i > ii C. ii > i > iii AB. iii > ii > i 4. The number of 13 C-NMR peaks for the following: ii i i i i Pentane Cyclohexane 2,2-Dimethylpropane 5. The relative Rf values in normal thin layer chromatography of: CO 2 CH 3 O H CO 2 H i i 6. The 1 H-NMR chemical shifts ( δ in ppm) of the indicated hydrogens: CC O C O H H H H C H H H H i ii iii 7. The formal charge associated with the following structures (most positive to most negative): C H H H O H H H i ii iii Cl
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Chem 351 FALL 2009 Cont'd Page 4 of 17 Use the following code to indicate your answers.
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351mt09 - THE UNIVERSITY OF CALGARY FACULTY OF SCIENCE...

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