Exam 1 key - Chemistry 333 939:“9’N.‘ NAME: Keg Exam...

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Unformatted text preview: Chemistry 333 939:“9’N.‘ NAME: Keg Exam 1 CHEM 333 Fall 2010 Exam 1 September 16‘“, 2010 RECITATION DAY: Sept. 16‘“, 2010 Be sure your exam has 10 pages, including this page and a periodic table. Read the directions carefully for each problem. Write CLEARLY; illegible answers will be considered incorrect. Avoid even casual glances at other students’ exams. Do not use red ink. Stop writing and hand in your exam promptly when instructed. Late exams will have points deducted. Please leave quietly if you leave eariy. Put away all celiphones, pagers, notes, books. etc. You are only allowed a writing implement and molecular models. Work the easiest problems first. Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7 Question 8 Question 9 Total Bonus Score: 10 points 12 points 12 points 4 points 6 points 20 points 15 points 15 points 6 points 10 points 100 points 110 points Chemistry 333 Exam 1 Sept. 16‘“, 2010 1. Multiple Choice — put the appropriate letter in the box .2 pts each (10 pts). A. Which orbital below has more 5 character? a. p b. Sp c. Sp2 (:1. sp3 B. Which of the following bonds is the most polar? a. F-F b. H-F o. C-H d. C-Si C. How many s-sp2 bonds are there in the following substance? \ / £1.09”? Ut-l’hwix) D. When the I S orbitals of two hydrogen atoms combine to form a hydrogen molecule, how many molecular orbitals (MO’S) are formed? 9.05793 ewmw B. What point on the potential energy diagram below represents the most stable state for the hydrogen molecule? Chemistry 333 Exam 1 Sept. 16‘“, 2010 2. Draw tw_o reasonable resonance structures (indicating formal charges, of course) for each of the compounds given. below and indicate how you obtained them using arrow pushing (electron pushing). Circle the structure that contributes the most (is the most \ W . stable). (HINT. Draw 111 all of your hydrogens.) (12 pts) Co» \MQ \w mmmmm We w a) \ft" ‘35’ :3“M ‘% a“ QC} eta-4 3. Clearly indicate the hybridization of each of the following non-hydrogen atoms. (12 pts) c.) =“~:\\\/O“‘H T $9 13?? Chemistry 333 Exam 1 Sept. 16th, 2010 4. What atomic orbitals on each atom contribute to the bond denoted by the arrow? In other words, what two orbitals bond. together to make up each sigma (c) or pi (7:) bond? (HINT: Your answers to question 3 should help you with some of this.) (4 pts) \ (A V . . . . , {W ” 5. Dravga three d1men51onal representatlon for each molecule. Indlcate which ones have 5‘ moment and in what direction it is pointing. (Show the dipole with our special arrow.) (6 pts) ca onozF CHZO Chemistry 333 Exam 1 Sept. 16th, 2010 6. Write in the products of each of these acid base reactions. Make sure you write in the conjugate acid and the conjugate base in each case. Indicate which way the equilibrium lies by CIRCLING either the starting materials or the products? Hint: Remember your pKas & don’t forget your counter ions. (20 pts) a.) \ VNV HBr "H0039 H2804 Chemistry 333 Exam 1 Sept. 16“: 2010 7. Rank the following by circling the strongest acid and putting an X through the weakest acid. Circle the property on the right that contributes to the trend you observed. (15 pts) (21.) I Property (Circle One) induction Resonance @e) Hybridization Electronegativity Induction Resonance Size HO CCE3 Hybridization Electronegetivity O O M Induction @ Size Hybridization Electronegativity (61-) induction Resonance Size . 69 WW @ W H30 Hybridization {gectronegativity Induction Resonance Size " /_ __\H H3 H ~— H /fiybridizatio _Electronegativity Chemistry 333 Exam 1 Sept. 16th, 2010 8. Refer to the compound in part a) to answer the following questions. The numbers by each carbon and the letters by each oxygen or nitrogen atom are simply there to label the position. (15 points) i a) Circle and label (identify) all of the functional groups in the compound below. If any of these groups classify primary, secondary or tertiary, designate this also. i \WQ _ O ..flc Qty-i Hi1 @wae, i a \QSWWQ b) What is the hybridization ofgcfialrbon 1@ 63??“ c) What is the dihedral bond angle formed by carbons 12-13-14? Wet DD” d) What is the hybridization of carbon 11? a? K e) What is the dihedral bond angle formed by carbons 3-4-5? W535“ i) What is the hybridization of nitrogen b? “*3”? g) The lone pair of electrons on nitrogen a are in what type of orbital? est:2s% h) The lone pair of electrons on oxygen c are in What type of orbital? SP1 Chemistry 333 ' Exam 1 Sept. 16th, 2010 9. (a). Identify the following amines by circling the secondary (2°) amine and putting an X over the primary (1°) mine. (2 pts) N\ \mm (b). Identify the following alcohois by circling the tertiary alcohoi (3 C’) and putting an X over the secondary (2°) alcohol. (2 pts) m s@ (0). Compare the indicated bonds. Identify the longest bond by circling the compound and put an X over the compound with shortest indicated bond. (2 pts) W i1 11 Fur... //——m .._m Chemistry 333 Exam 1 7 Sept. 16th, 2010 BONUS (10 pts) (a) We discussed this on the last day of class, and if you know your acid/base stuff you should be able to answer this. Circle the weakest base and put an X through the strongest base. (6 pts) (b) For those of you who come to class, Dr. Wiskur talks about the idea of resonance and how a charge can be shared between two atoms therefore sharing the workload of carrying the charge. What real life example does Dr. Wiskur use for sharing the work load? (4 pts) ...
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This note was uploaded on 03/05/2012 for the course CHEM 333 taught by Professor Lavigne during the Fall '09 term at South Carolina.

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Exam 1 key - Chemistry 333 939:“9’N.‘ NAME: Keg Exam...

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