Test I 14 key - CHM 242 First Name Test I Prof Shin Last...

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Unformatted text preview: CHM 242 First Name Test I Prof. Shin Last Name October 17, 2014 ID # Signature 1. Leave your ID card picture up on your desk. There are 6 pages plus a periodic table. 2. You may use the back of the periodic table as scratch paper. You may rip off the periodic table; we do not need it returned to us. 3. The answer key is accessible by Blackboard after the test. 1._______/13 2.__/ 26 3._/27 4 _/24 5 /10 TOTAL / 100 1. A water molecule and the electron configuration of the ground state of oxygen are shown below. llzp Q9 L— O. / a,” T ¢ H ”H . _ 23 La. Draw the electron configuration of oxygen in the water molecule. Fill in your answer to the right of my ground-state electron configuration below. (6 pts) Eliza Energy T; ._> 4,4— 4-14- 4&- YOUR ANSWER HERE 1..b Does this ground state electron configuration explain the shape of the water molecule? Briefly explain your answer. grits) No. Odo] 393’ lug/(Judie MW MGM Q's kW W. W W 4 Orbtlzcaa/ '2 I. (W l?) Hi5 M 2— Mth WW 2 pm 06 9"3. AW W Moatéc’ 1.c. Does water have a dipole moment? Draw water and indicate any dipole moment appropriately. (3 pts) 0 YCS. {+612} M M W H / \ H l: 2.3. Draw the mirror image of #1 on the right. Your answer is "# 2." (8 pts) #2, Mirror |mage‘(your answer) 2.b. Circle the right answer below to the following question (2 pts): #1 and #2 are enantiomers } diastereomers identical Briefly explain your answer (4 pts): ~ iii +11; M WICWLfl-O WL/wxaffiw trio-in — Wmfoeow 2.c. If you place a 50:50 mix of #1 and #2 in a cuvette and measure this sample in a polarimeter, what kind of reading would you get? Briefly explain. (4 pts) pagan/maxim We 0 ”TN; tum Wm‘l’lW Cam/Leo QM'LOHU/i’ OWJL 2.d. Circle the chiral center(s) in #1. Figure out whether the centers are R or S and show your work, including prioritization and drawing the steering wheel. (8 pts) To? a C guiidwx bx 3 3-K]: “W “f 3.a. Draw the most stable chair form of the molecule drawn below. Put your drawing on the right side of my drawing. (10 pts) 3.b. Draw the Newman projection of the molecule. Put your methyl, alcohol, and t- butyl groups on the pairs of carbons that form the Newman projections. (10 pts) 3.c. On your Newman projection, clearly circle any gauche interactions. (7 pts) HO "”CH3 6““- C 4.2!. In the 5N2 reaction below, give the mechanism and product(s). Show clearly all stereochemistry in your structures: do not figure out R and S. (14 pts) 4.b. Draw the energy diagram for the reaction in 4.3. Be clear about differences in energies of the reactants and products (thermodynamics) and of the pathway (kinetics). Label any "reactants," "products," "intermediates," and "transition states." Label the AG and the Ea of the reaction clearly. (10 pts) Reaction Coordinate 5. Briefly explain whether the equilibrium below will lie to the left or right. Show analysis of your reagents' reactivities and use pKa values. (10 pts) Qléc ”4 PK“ [645; Mi + >o- = Hi- + w . gth/i 5W (New weal/LN Md (cwdlb M . {(20%} GM? M010 5W0 Malawi Cw WWW ...
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