Exam 1 FS07 - CEM 351, Fall 2007 Midterm Exam 1 Friday,...

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CEM 351, Fall 2007 Midterm Exam 1 Friday, September 28, 2007 1:50 – 2:40 p.m. Room 138, Chemistry Name (print) L. T. N. Swers Signature Student # Section Number (2 pts extra credit) Grade? . 1.(20 pts.) . 2.(20 pts.) . 3.(20 pts.) . 4.(20 pts.) . 5.(20 pts.) . 6.(20 pts.) TOTAL (100 pts.) Score Note : Answer any 5 questions for a total score of 100 pts. Be sure to look over all the questions first before beginning the exam, and indicate which five questions are to be graded by checking the corresponding box. Recitation Day and Time Instructors: Room 1. T 9:10-10:00 a.m. Alex Predeus 85 2. M 10:20-11:10 a.m. Alex Predeus 281 3. T 10:20-11:10 a.m. Karrie Manes 85 4. Th 10:20-11:10 a.m. Kostas Rampalokos 287 5. T 10:20-11:10 a.m. Alex Predeus 283 6. T 11:30-12:20 p.m. Kostas Rampalakos 283 7. Th 11:30 - 12:20 Kostas Rampalakos 85 8. M 4:10-5:00 p.m. Karrie Manes 110 9. W 4:10-5:00 p.m. Karrie Manes 110
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2 1. (20 pts) (a) (3 pts each) Form acceptable Lewis structures for the following uncharged compounds by adding the necessary nonbonding electrons and multiple bonds: N C O H H H Formamide O C O Carbon Dioxide (b) (3 pts each) Assign formal charges as necessary to the atoms in the following Lewis structures. O C O O H Bicarbonate Glycine (an amino acid) C C O O H N H H H H (c) (4 pts) A full description of bicarbonate (above) requires two main resonance structures. The one you completed was one; draw the other one: O C O O H (d) (4 pts) Shown below is another commonly published representation of Glycine. Is this a valid resonance structure of the version in (b)? Please circle your answer and explain. Yes C C O O H N H H H H Explanation: Resonance structures are related only by moving electrons/bonds around, not atoms. This structure has atoms in different places than the one above; instead of the charged H 3 N + - and -COO groups as above, it has H 2 N- and -COOH, both neutral groups.
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3 2. (20 pts) Consider the five Newman projections below. H CH 3 H H 3 C H H 3 C H 3 C H H H 3 C H H 3 C H 3 C H H H 3 C H H 3 C H CH 3 H H 3 C H H 3 C A B C D E H H H H 3 C CH 3 H 3 C (a) (2 pts) All of these diagrams depict compounds of formula __ C 5 H 12 ___________.
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Exam 1 FS07 - CEM 351, Fall 2007 Midterm Exam 1 Friday,...

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