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Chem 3A Midterm 1 Answers Key

Chem 3A Midterm 1 Answers Key - 3m:11" j J”(£01 6 E...

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Unformatted text preview: _/ 3m :11 /" j; J”, /,'-' (£01... : 6? E 1 5' 1's - T" f-€fd ‘ z 1' 4 C #3,; .1! f 'r 3‘ i/ V w -:.. ‘33 if??? ’0'" - .6 "1 3w a Wt;%'1r-c. * 1'13”.” 'J "I? arm-1.", “ragga 2 ’:'rr:rr,~:c.¢ 4 Q27- :‘ '2 "29:33; i 5 :’.v1 av - I _. I H ".'_""' '7'." '3’- I TOTAL Feb 22. 2006 Pagesof 1o '4 5. ( 13 Points). (3) Draw 3 P0130191 energy diagram for the rotation about the CZ—CS bond of butane. ' Show Neman projections for all conformations located at the maximum and minimum points on your I graph. Start the potential energy curve with the lowest energy conformation at the location marked with an x on the graph below and assign reiative energy values to all the conformations at energy maxima and minima on your diagram. __.._.' I 20 1 80 240 300 360 Torsional angle (1:) WC—CbondwouldbreakfirstinapyrolysisreaofionzaC-CbondofemaneoraC-Cbond of ZZMW?vaideagMega_npa_figusingmedatampagew- ch—‘rcHg '30“; Aitsoclafibn E _-_- 30 lad Maj H36, (EDIE) I l ' - -—l use-fécun 130E- 87Ke41mh i.____JL_J i___| a ' i -_ _.-. __- .-_..—ur-3IGIIIw-fltfll! NISWBT: [U {'4 k‘ Iii-3'“. I -‘ . . . . deduce the shape of the molecule of BeHz? Answer: l V‘ E a r Chem 3A Feb 22, 2006 Page 7 Of 10 6. (12 Points}. (a) Show a mechanism (equations with the appropriate curved “ ' ws - I f I the formation of Hzc=CH-CH3 dunng the thermal cracking (pyrolysis) of butanngJEr-‘gilzifcagm for 3 | H3c~m2—C-HD—’E-Hz A? “tic—CHL'CHL' 'CH: Liza—$3111?“ —.—> Hzc—CJ-l: ah. Mme” - 3 + 6544 (b) The reaction of cyclopropane with chlorine (C12) in the presence of light is known to produce 1,3-dichloropropane. Write an overail equation for this process and show a step by step mechanism for the formation of this unexpected product. Calculate the change in enthalpy for this reaction Cher 7.( ' mixtt has: ’ Optil (b) A cloclt Ansv (c) C your has a Specific rotation of +8.5”. Show the detail of your calculation “paw = mm: 3000:: 10.; a u "' 9a: a 204 6-) +533“ “mama a {46; (4.) 402 (-J Optical purity = 2d 04'! %of(+)isomer= 40 %of(-)iscmer= 60 (b) A solution containing 0.79 per 10 mL of coniine is placed in a 5on1 long polarimeliercell ead'iihisa I clockwise option! rotation of 0.6”. Calculate its specific rotation in]. —-§— "'" _____—r-——-O'€ — '7‘ Ed“ bit 0,310.07 "' I 6 Answer. [a] = | 7 (c) Calculate A6” for the dissociation offiuoroaoetic acid at 25°C (pKa = 2.66). Show the mas-0f ' C your mlculation. AG": —-i9:l' 2mm = -2.3 iii-rue} k... : 2.3 v. [x as? x 1.“ -.-.-. 2“! as! MSA '- - Fob22.2006- .-8.{ 15 .mtiJMl-dnr Mr. forms major product“) Obtained in mu“ 1'- - . " mom!” won! MW WI!!! light at room mmraturo. ...
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