chem 2211 exam 1

chem 2211 exam 1 - CHEMISTRY 221 l EXAM 1 September 17,...

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Unformatted text preview: CHEMISTRY 221 l EXAM 1 September 17, 2008 Be sure to read each question carefully. Partial credit will be assigned where appropriate. On answers written in en and in the associated boxes will be raded. Relax and { 3.1 .__.———- / "2. Considering the structures above, an N-H s'- 1 e bond is a E bond 7_ 10. orbital from N and a ———-—\ orbital from H. . O TOTAL 2. (8 points) Draw a non-cyclic line structure for CH2N2 that does not contain an sp3- hybridized atom and in which no atom possesses a formal charge. ORE «i r F good luck!! L _'{J’_ h- 1. (14 points) Draw four isomeric line structures for C3H9N, showing lone pairs: 2 8 § / E‘- (L — L. ' . I M" L 3. (p 4. g < 6. f " ; K. 7. l 0 i "NZC2N—H What is the hybridization of the nitrogen atoms in this structure? What is the hybridization of the carbon atom in this structure? (hybridization) 11 each of the following molecules where the In the box below each structure, write the ed by its nonzero formal charge 4. (12 points) Assign formal charges to the atoms i formal charges of the elements are nonzero. Mymbol for any element possessing a formal charge follow (for example: X -1; Y +2). CH I 3.. . e . . <3 .5? a [430— —NEN: (CH3)2—O_PBF3 5. (10 points) What kind of molecular orbital (er—bonding, o-antibonding, 1t~bonding, or 1:- antibonding) results when the two atomic orbitals in each pair below interact in the manner \0 indicated? 5. (continued) 6. (9 points) Write in the box beneath the species on the left-hand side of the following equations whether the reactant is an acid or a base. + —\ '- CH30H + H“ CH30H2 r ‘- + - i a a (.3 q-TiCI4 'CH3CCH3 + 11014 H3C‘C'CH3 | / / .‘_.‘ [\- 37*? I?! I_I\+/BH3 _, if N BH3 [N] i I .J' 0 E J + 0 I s a IE i£ i 3 If}; H} Li. I? . 6. (continued) Sodium methoxide, NaCH3O, is the sodium salt of the conjugate base of methanol (pKa = 15.2). Complete the following equilibrium. % \ 8. (12 points) Consider rotation about the C3-C4 bond of 2,4-dimefl1ylhexane. Carbon 2 is identified on the Newman structure. Complete the strucmre by drawing the Newman projection of the rfiost stéble conformer. OJ. 3 CH 3 ' i \I \ ‘ / 9 c. _ -:.: CH «C (9“ r /GJ " :33 , x L, i I. .i I} \ kl \\ 2 CF /. .3 8. (continued) Consider rotation about the C2- C3 bond of 2,4-dimethylhexane. Carbon 1 is identified on the Newman structure. Complete the structure by drawing the Newman projection of the (least stable staggergdpbnformer. Lfi 3 U4 ,1 v a? ‘ '— ‘ :c/ in; ix, / C1 ——-—* CH l .» \ ‘“ \ cu CH 199. I 2" r1.-__i_fi U ~ r _. \_ a: CH 5 Consider rotation about the C4—C5 bond of 2,4-dimethylhexane. Carbon 3 is identified on the Complete the structme by drawing the Newman projection of th (: least stable conformer. CH 9 C_‘-.-* .- i r C ffk‘ ' . / " '._ \ — K 2' \ C‘i f‘ -- 51' 1» wig-1 1 ’ lysl' fir" ’7'" '- il - r. 6 is a mineralocorticoid hormone that co (e.g. amine, carboxylic acid, and so 9. (12 points) Aldosterone body. Circle and name found in aldosterone. 10. (8 points) Provide an IUPA \A-IHW “Ji " ‘23 r‘r‘J.A"'~"\-»3\1 " 3 " \ ntrols tissue swelling in the forth) theCsfic functional groups MFA AiLohoi C name for each of the following compounds. /. 5 U 1‘: UT \ariCL.1rI;,\-QT?QA*‘i-fk.mqt ...
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chem 2211 exam 1 - CHEMISTRY 221 l EXAM 1 September 17,...

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