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322as09_plq1_2_key

322as09_plq1_2_key - 6L CHEMISTRY 3 2 2‘ We W Z...

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Unformatted text preview: 6L CHEMISTRY 3 2 2‘. We W Z prQC/{IQ @fiacow FIRST LAB QUIZ ,. 5/0 92/002 M BY Rage K” NAME 1.(13) ._m 2.(11) Lab time 3. (9) T.A. 4. (9) 5. (7) This test comprises this page 6.(11) and six numbered pages. TOTAL (60) If a question says to answer in fewer than a certain number of words, DO SO--deduction for wordiness. ave quizzes at (make—up) and office rs. Labs Oct 30,V-» v 4 are make—up on - ' stay one-half hour if no one is d a lab. Morning labs GC make-up ' I ov 3, 6:00 p.m. Fo rading questions on this te E YOUR TA FIRST. £113 1. (2) A 24/40 male (inner) standard taper joint has<Zall thickness a 1.5 mm. Calculate the diameter of the largest spherical object which could pass through the joint. 1+ F 90 of narvauwzm {1% (L 7‘08"” I7 ‘ ‘1 ' J 2. (2) In <10 words, state the -~- c aracteristic of an O—ring. Saying "it's round", or equivalent, is worth at most zero.£g;;:;;; Ito WfiéC/‘IL/m C4 (“Crud“- 3. (4) 4—Methyl-2—pentanone is made into 4—methyl-2-pentanol. One wants to check the product for unreacted Starting Material. (a)(2) Near what frequency (cm‘l) in the IR should one look to see if there is considerable unreacted SM (circle one number)? 3800 3400 3000 2800 2200 2000 1500 (b)(2) Does the product sample need to be nearly water—free for this C: bf fFIR test to be useful? Explain your answer in <15 words fragé NO 3w0 cw" “4r .fl‘lfifln O’FW ‘ Cd! M ) 40M ML Wmfw. 1700. 4. (2) A flask is flushed with ether, (C2H$)20, bp = 35° , then drained. Tell whether any liquid film will evaporate faster with the flask neck up, or neck down; explain in <12 words. The effective MW of air = 30, bp ~ -200°. (cpl-.400 ‘- '7‘]- fl Uafior “2%, 44 Ant/u 092: m rawwmé M We! 5. (3) An aq soln containing 27.0 g isopropyl alcohol (IPA, d = 0.79) is "salted out". The resulting 35.7~mL Upper Layer weighs 30.0 9. Calculate the fraction of the original IPA in the UL. nsitm P,wto 00 De yg/L l'A ‘7 Z if?! f “L: (Ti/L. 0990 65 Lr‘thL- 3333 333 .-.~ 0.330 m <7 3;, WWW 0.940 36.1 ”92° 45-0 :37 mw f/W an 0L?— 0.900 53.5 ’ 038° 61-9 o 3qu 0.737 12M_ 2 ._ 3:333 333 7a is ——T—3——? a a , m} 0.820 86.9 13 €/ 333 33:3 ‘ g; 0.786 100.0 17.06 - vuu: 6. (3) Note the supposed normal NO Ll. _ no pressure liq vapor phase diagram for cyclohexane (CH)/furfural. It errs by saying there is no va— WOW por in equilibrium with ”fur-L :olns othCH>O.25. . kgbo CL t e a r c rve {Z ssume v po 11 18 W0 [6 correct. What must then 120 Q ‘5 Q 1 rum: ( C) amps 7. (4) Note the distillation curve below for 100 g of a solution of L (lower boiling) and H. L and 1-! do not form an azeotrope. '6 EEEEEEEEEEEEEEEEEEEEffiEFfiEEEEEEEEEEEEEEEEEEEEE 0 (“ml/417°“ IIIIIIIIIIII|I .I IIIIIIIIIIIII IIIIIIIIIIII! I. IIIIIIIIIIIIIIIIIIIIII 9 IIIIIIIIIIIII II .II III-IIIIIIIIIIII IIIIIIIIIIIIl I' III IIIIIIIIIIIIIIII II...- IIIIIIIIIIIII 'III-IIIIIIIIIIIIIIIIIIIIIIII-IIIIIIIII IIIIIIIIIIIII III I I III-IIIII IIIIIIIIIII- .III III-III.- IIIIIIIIIIII‘ IIII-IIIIIIIIIIIIIIII-IIIIIIIIIIIlI-II IIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIII' l IIIIII-IIIIIIIIIIIIIIIIIIIII I III-.- IIIIIIIIIII'II III-IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIII'.II III-III-III-IIII-IIIIIIIIIIIII- IIIIIIII'ZII' III-III.IIIIIIII-IIIIIIIIIIII-I I III III-'ZLCIIII III-III-III-IIIIIIIIIIIIIIIIIIIIIIIIIII Z-IIIIIIIIII III-IIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIII III-IIIIIIII III-III-IIIIIIIIIIIIIIIIII-IIIIIIIIIII III-IIIIIIII III-III-IIIIIIII-IIII-III-IIII-IIIIIIII Lam/x. ‘° ‘° lhmé‘arrmsgo ' Below, circle one of the items separated by / in each set. From the curve, the bp of H ' -/ at most 393°, and the mixture was about 20 / / 3O / 75 / 90 percent L. 1% 10¢ 30 8. (4) (a) (2) Consider an ALcohol, a Ketone, and a Carboxylic ACid, each having nbp ~ 140°. Circle the correct descending 9mm: of their (WP/degree (dP/dT) near their nbps: AC>AL>K AC>K>AL AL>AC>K K>AC>AL K>AL>AC (b) (2) This order is the same as the order of the change on vaporization in the molar state function (circle one): [email protected] A713? 9. (2) W(ater) and odorous cpd D are mixed. Two liquid phases exist at equilibrium——one is 1.0 mole 1; D, the other is 5.0 mole % g W. Assuming that in each phase, Raoult's Law applies to the 0M majority component and Henry's Law to the minority one, give {=er Ptotal for the W—rich phase, in terms of WW and 9°09 WW” 0 M Ptot, w-rich phase = Oqu0 +~ 0?5/00 10. (3) de A steam distills at a mixture hp at which P°w = 5/6 the external pressure. (1) Calculate the ratio, molesw/molesA, in the distillate. (2) If the distillate has 12 9A per 6 gW, i.e., per 1/3 mole W, calculate the molecular wt of A. MR mid» wifl a; altars/M: (0/51, 7'7" [(EMIC I4 Jv'filvl/S cw‘flt % “44/th 22> (lgfsfiwlefi =§ MW” : /X0 11. (2) Ethyl acetate, CH3CH20COCH3 is often used to ex— tract aqueous solutions. Tel in <10 words why it is ,. suitable for extracting liquids boiling between 0° and 100 ngszwé am kiwi wrfl 6p {0 c/m 7% M to c. 12. (2) A student has limited extraction data. S/he knows only that extraction of 10 mL of a soln of C with 20 mL Extracting Solvent left 25 times as much C unextracted as did extraction with three 2,0 mL portions of BS. Given that Fraction Unex— tracted for this case = 1/(1 + z)“, z s K(VB/VA), calculate K. H — q _ i - 7 13. (3) Pure J has mp = 95°; pure K's mp = 9 °§7a certain sample X melts 84° - 88° and is suspected to be largely J, largely K, or possibly little of either. Mixture mp J and X = 86° — 89°; mmp K and X is 82° — 87°. Giving your reasoning in <15 words, ‘f/ state the likely major component of X. 14. (3) A solid sample comprises 11.0 g M and 7.0 g N, whose solubili- ties in a solvent S, bp = 65°, are independent. The solubili- ty of each in no; S is 10.0 g per 100 g S. In gold S, M's solubility is 1.0 g per 100 g S; N's is 3.0 g per 100 g S. The entire sample is dissolved in 250 9 hot 8 and then cooled. Calculate how much each of M and N precipitate; put a num; he; in each blank. NO credit without calculation/explanation. f M M WC Sa/b Art/(W: L9 ? =(//.O ‘fi‘an-Tfifa M4 500 _O__9N a" 1 N “7.53chalwfi/SEUJ (A [clam/é 14. (3) Wicked Witch of the West (WWW) is very Water-soluble; at 20° a satd aq soln is 75 wt% WWW. Restate this fact in terms of mu depression, stating how many kg W one must add to 45 kg WWW to lower her mp to a certain T. Use <15 words; zero if refer to soln or solubility. 13a m‘l {0/1, . 7W8 “tr a) couch folk wan‘ 44 50 (Ci -' Mf W (VIC; OJ. Molefi'w ¢ [53%. A) fi(:§:fi/WWW [ow-m L14 “70 7% 10°. 15. (7) Recall the n-BuI prep: acetone n-BuEr + NaI n-BuI + NaBr+ MW = 137 FW = 150 MW = 184 d = 1.27 = 1.61 flemeQA/flu WM‘AWM' (a) (4) Suppose one is sure s/he can get a 240% yield and needs at Stud/1 least 10.0 mL n—BuI. Calculate the minimum mass (in g) of g-BuBr (limiting) one must use to assure this result. 9, 03:15:41‘ = xo.o wL x (6/ JAE {61} , = u M44 a “I Ifl‘faw/ = 0.0K7f‘ka/m bazmmo m/ Ma ,9? :. nrwz Mu: ‘ . . 0.5; Mw/ “'dME :2/K7J' @fl #z'éé’ia’ / 0 Win-em. w 07 n~€w€r -_- 212.76 mm KW MW ’1177 (30,0) 3‘ CU (b)(3) The reaction was done by zefiluxing, i.e. , heating under re- flux. Tell what this means and why it is often convenient. Use < 30 words total. Minx“? 66 AM {‘5 wc'flx a (macaw!) awn/W W ‘ok N/{LLUM «flu/t [oz/x will 1‘» fit Mf‘ (Lula? “6 ,OJ/Mm'é mm a" e/e “12/ 1% ”laws“ W “W H .. b _ 16. (5) 11m Aglkszall (1) n-Bu-Cl ---—> n-su+ + C1‘ + 185 (2) n-Bu-I ----> n—Bu+ + I‘ + 171 (3) LiCl ---—> Li+ + Cl‘ + 199 (4) LiI ----> Li+ + I‘ + 174 ~ , in acetone , (a)(2) Calculate [lern for n—BuCl + LiI ——————————— > n—BuI + b191, assuming that the acetone solvent has no net effect on LlG rd AG-= @3qu Mar ~49 fl~€u3£+ LRC/ HM 447+ — (7/ 4’7? W (b)(3) LiCl does not precipitate here, as NaBr did for n-Bu—Br + NaI in acetone (Pd 7 lab). Explain why the reaction above need not "be driven by precipitation". For simplicity, assume the soln is saturated in both salts; use <20 words. f” « m/vdM’ 50/51 of & Calf/I ('3' MCI, 56“" G'ch/ugmlu. {4 4441/4 arm W! m ,4 ”1,1,6, 17.(6) The reactions below give the as shown: 2% AgNO3 in 95% EtOH m 1 ‘CHs’f‘Cl "§;;'e7"‘7"£;‘a"’ c ion 18 s . 2% AgNO3 in 95% EtOH (CH3)3C O—Et rxn 2 CH ) CH—CH -Br -------------------- > ( 3 2 2 Reaction is slow. Explain in mechanistic terms: (1) why the product is the ether, not R-ONOz. (ii) why rxn 2 is much slower than rxn 1, and (iii) how isobutyl bromide gives a t—butyl product. Draw structures, use <50 words—~complete mechanism not needed. I‘KH ”k 0) EM t’gufi) .WC/t’ WW Wifl’ “VIZ".‘C ...
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