322as09_plq1_1_key

322as09_plq1_1_key - CHEMISTRY 322aL —April_1,—aoea...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 6
Background image of page 7
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: CHEMISTRY 322aL —April_1,—aoea {HEHHKLéHMHL ppq C‘ICECJL 3C0? FIRST LAB QUIZ “ NM fl Kt:le 3”: l.(10) 2.(12) Lab time 3.(12) T.A._a_fi‘*________________~____ 4.(10) 5.(10) 6. (6) TOTAL (60) This test comprises this page and six numbered pages. If a question says to answer in fewer than a certain number of words, DO SO. Deduction for wordiness. Tag will have quizzes at office hours and make~up lab. Tuesday morning lab convenes at 9:30. For grading questions, please see your TA first. 1 (2) A 19/35 female (outer) standard wall. ‘00“ {4M}. 2% An O~ring's size is given as '8 Km (2) no )uaing < 10 words. 1:00: .5 x 10.5" possible, calculate its thickness. p52=m) taper joint has a 1.0 mm thick 0 M“ ‘NTS-MM “4d Inn N. “CA </€.4"+ M.“ $117. {HM [millimeters]. If It not possible, tell why Calculate its Outside Diameter (OD) at its narrow enZE4EZQE§ V7 mnmw 1:0 :(H ~73!) OU~ £0 = 1.0 mm =? («It‘d/fly n‘ l X-Iecfi'm 1): Complete the following sentence, (in general) of a liquid, A, in Below is the distillation curve There is (lower boiling) and H. From the curve, L's bp is original mixture was about 2 [.0 Mm- (Cut-L (9, (Libbey =J/.Om defiining the boiling point <12 words. The bp of A is . 41‘ “Watt V10” gfifirmj ,onmwuc. for a 100 g of a solution of L no azeotrope in this system. *1“ p3 23/2 5. (2) Both Water and Acetic Acid have strong H~bonding in the liquid state. W has an abnormally high Agvap, but AA's Agvap is abnormally low. Using <25 words, explain this difference in terms of the nature of their mm. M km W0Cfa-{ka/ [Hindi but flOrM&{ (mono- molecu{ar)voy0r gemak S beZUeen LHI- 4H hm Mac, 2931:; /O¢.J S alc‘fieerildt (66w Lf-V], 6. (3) A pure organic liquid shows strong :C=O, i.e. carbonyl, ab- 0 sorption in the IR. But the spectrum also shows that all the \\ "L H's in the compound are bound to sp3—carbon. Name or draw two, Q ~ 2:0 agile] ’C=0-containing functional groups excluded b this result ' (QrAOKYIFC a (2/ I —- g—OH,‘ H fl trim/4 (‘3 «met , - 241:“ (we/L Wafmm 7. (2) An aqueous solution containing 20. g isopropyl alcohol (IPA, "yd ._....9d :2 0.78 is "salted out”. The per Layer weighs 13.0 g, and we on its density of “.535 g/fi. is 80% IPA. Calculate what fraction of the original 20 g IPA is in the UL. 2m 50 ({r w W’ k“ “('03 “at K 0.8% oat“)! 7 7- #1146. Flo/7 M £74 Mr Mellow” - 8. (3) de C, MW = 108, d = 0.80, is steam distilled a external = 760 torr. If P°macer2 = 600 torr at the mixture's bp, calcu- late the volume ratio in the dist llate. . {rm (In)!va o l x 0.80%:- 0 fig (760*600) MC ’03 ‘7‘le (o J “40' «L5 at equilibrium--one is 1.0 mole % D, the other is 5.0 mole % 144,9 ('F W. Assuming that in each phase, Raoult's Law applies to the majority component and Henry's Law to the minority one, give U Ptotal for the D-rich phase, in terms of P°w and P°D. d Ptot, D-rich phase = ’9 *‘ quf’oo _ 3 _ I’d, 1£.:: / ’l/ 10. (2) A halfi»saturated Org Solution contains 3.0 9 W per L. A certain Drying Agent system has relative humidity = 5.0%. A small excess of DA is added to the wet OS. Calculate the 1 A final Water concentration in the OS. Haff’ryifx 05 (m rk=§0?’o. rend 600m : 3.0 30/1.“ K/g'.‘ Q30J%°S [gr LOKTED 11. (2) Six hundred grams of an OS contains 3.00 wt % w. For a DA of : capacity 0.40 9 w per g DA, calculate how much DA is needed to 045’ dry the OS. For this calcn, assume all the W is removed. @ aw =05; M 12. (6) For cpd F, KVB/VA, (i.e., z) J7QVV’Calculate the fraction of F nnextracted [FUR = 1/(1 + (z/n))n] for (a) use of B all at once, and (b) use of B so FUE is minimized. Take e3 = 20. (a)(2) (b)(2) I H F0“; 2 —--- Fdfzu-rga (Mafia /- .. .L. e6 ~ m) (0,002.!) (mfg, 0,002.11. ) (c)(2) As 2 increases, the FUR for (b) compared to (a) (circle one)-- decreases, which is better decreases, which is worse. increases, which is -e er. increases, which is worse. 13. (2) J has mp = 100°, and L has mp a 130°. The most probable mp for a mixture of 90! J and 10% L is (circle one answer)-- 75° 99° 103° 115° 127° 135° - 4 _ [’67 11.3: /(:) 14. (2) A certain sample x, of mp = 75—80°, is suspected to be either largely cpd M or largely cpd N (but could contain neither). A mixture melting point with pure M of mp = 82—83° is 68-69°; a mmp with pure N of mp = 90-91° is 73-79°. Tell what these :afl“f(’ data say about the likely composition of X; give reasoning. of”? Mmr Wwof XU‘G 15. (5) A solid sample comprises 9.0 g P and 5.0 g Q, whose solubili~ ties in a solvent 8 are independent. The solubility of each in not S is 5.0 g per 100 g S. In cold S, P's solubility is 1.0 g per 100 g S; Q is four times as soluble. (a) 3) The entire sample is dissolved in 200 g hot S; the solution is ’46? I I'tL then cooled. Calculate how much of each substance precipi- tates; put a number in each blank. M )0 a. call (o/n <2 a 3.03 2-.) .o-Ro] )0 //IZ§. E2. 62 M m at or? 4M 5 1% Matt! C? oééalw’. (b)(2) After (a), one can get more pure P by boiling down the fil- trate and then cooling again. In <15 words, tell why one should not reduce the solvent volume below a certain amount; you need NOT calculate the amount. r; Mt (M m (owfélng/ out“ Coo-3m? Q cm mil/QUE. 16. (3) Glucose (dextrose, grape sugar) has mp ~148°. Addition of 0.28 9 water to 1.0 9 glucose depresses its mp to 70°. Re- 0 fl state these data in solubility terms. Refer to a temperature, the nature of the solution (dilute, conc, saturated), and give lfibr’ ‘\" solution composition as the mass ratio of glucosezwater. "$24M Alf 29°, on mfqu C453] 71% 50/01 AM (073(th a“ a) dV‘ == ea 3.1“? 06:40 {’3 2 5 (0 5 ' 17. (10) Recall the preparation of n—BuI: 6 l acetone 47/; E + NaBr n-BuBr + NaI .__...______;... n—BuI MW = 137 FW 2 150 MW = 184 - d = 1-2" «a» ‘W Z 1"" (a) (5) Suppose one starts with 4.31 mL n-B Calcu— late how many 9 n-BuI corresponds to a 75% yi - . mkA 5M "U’l wL \t (‘27 [‘77 a; "4" (Ll-OMe) “to “MC [4’01 2‘ 0.0%) “Max:313;— __ Ml¢ ' “‘7' 2/9”; Mr) Br (13) (5) (S)—a:Q-BuBr (the SH) . (S)~CH3CH2~C'IH-CH3, reacts with NaI in acetone, giving NaBr and (R) -ae.c-BuI. But: with AgNO3 in 95% EtOH, the SM gives. besides AgBr, mostly the m m, CH3CH ~CH(OEt)-CH3. Explain these results, using chemical equat ons and not more than 35 words of meaningful commentary. Um; w; M a 54)» (@5474; @ flavw‘w/Wwf Duff!“ 43 M03 (m 6&01 nflAI/t) @ quou/ (‘mffoq 6d(U¢u,ZL—-5 V1 éckcra/ cuéocd" (SM/[thA reach Wu‘flx “WM/i 4% Wjfiwf we: 5M...» cat-gmi-ffi'f‘arw 6/ [64/0 ‘“ flJ i=9 Remion 55m (1) n-Bu—Br --—-> We? 2v! +173 1 + _ (2) Ned ----> yfi‘ /f“ + 164 (3) 11% + / --_-) n_Bu_I - 171 ‘S-r 4) y‘ + r' ( E u") NaBr - 174-5 (5) NaCl -—--> Na+ + (21‘ *133 18. (6) Note the data below: H (6) n-Bu-Cl --—-> mm“ + Cl‘ +185 (a)(3) Calculate [gagverall for the reaction: n-Bu~Br + NaI -———) n-Bu—I + NaBr, showing your calculation. Cgbtmm‘ua, CAM/f MM 0/ ‘02 a4 tariff“, yivw WM ’1‘”, M 7: A6“; = AEWM/j (b)(3) Keq for the reaction of (a) above is >100, but its rate is near zero without the solvent acetone. Tell in <25 words, hog acetone facilitates the reaction uithgnt changing ($5 overall. No credit for tautology, 6.9., "it's catalytic", "it helps the reaction", “goodness in better than evil because it's nicer". MIL w hum Kw wk“ Uafircsu) firm. ...
View Full Document

Page1 / 7

322as09_plq1_1_key - CHEMISTRY 322aL —April_1,—aoea...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online