labquizkey3

labquizkey3 - KEV, '1' TA Chem 322aL Summer 2003 June 5,...

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Unformatted text preview: KEV, '1' TA Chem 322aL Summer 2003 June 5, 2003 i f. 0 LAB QUIZ #1 log ’/ (Three pages — 32 points) Cs glass. Calculate its inside diameter at its narrow end. 1% é>£7 65 a‘é’flmuq ¢£J‘— batbzi ~0“J{ 6LKJ4' 3. *0 CM ~+0(blg))wtm = M mm 44‘ mat/NW «em/t pp a (Lo —l(/.57)mM cur-«m Adz :VKW‘ 2. (2) In <12 words, tell why in greasing standard taper joints, one greases only the abOut the top third. T} W cau'l/ Vl/of W414 AW” 50 (‘vk’f‘o 6L 3. (2) A solution is distilled. In <10 words, tell what system property is necessary and sufficient to get even partial sepa— ration of the compon nts. LV a,“ a; loaf] 9L U470] [(14 «blouxlé a)va (IL W74 M W/Hifiw. 4 (4) Recall the equation for the sensitivity of 2? to T, i e., the slope of a plot of P vs T: dP/dT = (P/R)(ASvap)(1/T). A hydrocarbon, HC, has the same normal bp as a carboxylic acid, AC. (a) On the diagram below, mark which curve belongs to the AC and which to the HC, (b) Which liquid, if either, will have the higher hp at a external P = 1.5 atm? Explain briefly (<15 words); no calculation needed or useful. '::||!!IIII ; ;.::I Illflflflmlllflflflflflmll axsaz l W 0‘0 Hum HC C I E? iIEIMM lflllfllllflfll' Alul «J . _494q A: ' ‘JI-IIl-IIY . z:............. A Sm/ k « f ‘f’ l 2' I IflflflllflflflIIPfllliflufli th‘: 'V! ' IlllflfllllflflillflflUI-. :wwin; ,4; U“ %.i . Ilflallflfll' : ill iwmllflflnlllflflflllflflflfll [1 ’0 A2 ZLQKQ wing “f > 76/060”) C 1 Iflflllflflflml u I I Ilflllllflfll w—QV W ad~ 3%, :.!i I Iflflflillflflfllllflflflflml , <<:V€d‘fL r i.) IN “V 3 1 i ' i I "ml-mm“ val-fl 1——_‘ i.. 1'i ii i 11 Ill ‘ (A) (ff 1749K! Jul/2a); A.) o. (4) Concerning infra-red (IR) spectroscopy: (a)(2) In <8 words, explain why IR plates ar not made of glass. G/W abranér EX nfm we/cvmf WW]. (b)(2) An organic liquid known to contain C, H, and 0 shows strong C-H absorption but is transparent from 3450 cm'1 to 3250 cm'l. Based solely on these data, make the broadest almost certainly true statement about the compound; use < 10 words. fib® [1019‘ an. Cor Cod/McQQY /‘ 0v «(IO/M1 6. (3) An aqueous solution containing 20.0 g isopropyl alcohol (IPA) is "salted out". The upper layer (UL) weighs 22.0 g and has a volume of 25.0 mL. Using the table below, determine (1) what fraction (wt %) of the UL is IPA, and (2) calculate what frac— tion of the original 20.0 g IPA is in the UL. Aw. sszM s. Liv—07% : a M 0%!— Eéfi I 180“ Cg) fiflfl 223$ :22; :9 “L “a “4 0" 0'" ‘ (1} grflflm‘ 01L = who; x 0.6L 733%: —:. (3.961 f/// :‘914/26 4' 3:22.22 .3332 Ma PM ~‘ ML 2 if?) any. 7. (3) A substance C is steam distilled. From VP data, one calculates that the mole ratio of Water to C in the distillate is 6.00. Given that 20.0 g C co—distills with exactly 3/4 mole (13.5 9) water (MW = 18), calculate the MW of C. Q “49(440 7/? MAJ—on.) MM '2. {Wk C K «no/44 C 3* 0 50 W1 A /- cod 9 mass/1 8. (2) A two-phase equilibrium mixture of (W)ater and D comprises two hases. One base is 1.0 mole % D, the other is 4.0 mole % W. P Give Ptotal for the W—rich phase in terms of P°W and P°D. wvucj: pf) ‘f‘ (4) Compound E, dissolved in solvent A, is extracted by solvent B. For KV /V (i e., z) = 5, calculate the Fraction of E QnEx- B A tracted [FUE 1/(1 + (z/n))n1 if-— («9 w‘/% Ptotal, W-rich ¢ = (a) (’2) all the B is used (W?- M :0 M in one portion. l I I (b)(2) the B is divided into a veryqlarg = 2 to take e 2.7, e2 = 7.4, e“ 4’0"] J number of equal portions (OK S” Qqaf do ($00673) / (if e, M F1(E 1 l‘ I r n '“"‘—* :3 vi~ 2‘;;Z"=C2006K (W (+/‘ f 1’3 ~ w) Waco 5‘ e (e 10.(6) In Period 8, you will use a 2.0 (mass) % solution of Br2 (MW = 160, dens = 3.0 g/mL) in DCM (MW = 85, dens = 1.3 g/mL). (a)(3) Using the simplest dilute soln approximation, calculate the mole % Brz in this solution. 2‘ 395v '-‘ ef—T-l/MO 9 rig: ‘ L/Ieo + V5: % f (a, z: (33' m; =0 0/06 (b)(3) Calculate what volumes of BIZ and DCM one should mix to make 100 grams of 2.0 (mass) % Br2 in DCM. ...
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This note was uploaded on 10/21/2008 for the course CHEM 322AL taught by Professor Jung during the Fall '07 term at USC.

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labquizkey3 - KEV, '1' TA Chem 322aL Summer 2003 June 5,...

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