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322as09_plq1_blank - CHEMISTRY 322a;r M We QI'QCIQ‘C-L...

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Unformatted text preview: CHEMISTRY 322a;r M We QI'QCIQ‘C-L FIRST LAB QUIZ' BY Bflgfi NAME 1 l.(10)___ 2.(12) Lab time 3.(12) 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. (2) A 19/35 female (outer) standard taper joint has a 1.0 mm thick wall. Calculate its Outside Diameter (GB) at its narrow end. (2) An O—ring's size is given as "8.5 x 10.5" [millimeters]. If possible, calculate its thickness. If not possible, tell why not,using < 10 words. III-III- III-IIIIIII-IIIIII-IIII-II-II-l III-III..-III-IIII-IIII-Ill..-III-IIIII-IIIIIUIII-I III-IIII-II.III-IIIIIIIIII-IIIII-II‘I-U-IIIIIIHNUII III-Il-I-IIIIIIIIII III-IIII-Il-Ifo '7’] III!!! mu '1‘!- I-II-I-I-III-II-III III-I...-IIIICIIIIIIEII-Ul-III III-II-IIIII-I-I-I- III-I-I-ll-I-IIIH?:'HW”FI:=u-- III-IIII-Ill..-III-IIIIIIII-III-IIIIIHHLfind-gIla-II III-III...III-IIII-IIII-IIIIIIII-IIIIIIIIII-IV"...- III-II-I-IIII-I- III-IIII-IIIIII-III-IIIlI-ILIIIII III-III-IIl-I-II I'll-II-I-IIl-IIIIU'T:-----IIIIII w '--::::--::::::::a:--:--::::::::- I I... III-III... III-II-IIIIIIIIIIIIIII I... I. II...“- IIIIIIII-IIII III-III III-III...IIII-IlI-III-II IIIIHIIIII III-III...- IIIIIIIIIIIIII-IIII III-IIIIII'JI-II-I-IIII- I. .- IIIIIIIIIIIIIIIIIII - III-III-l-III-Il-III- III-I IIIIII--III-IIIIIIII-I-III-III..-I III-IIIIIIIIIIIIII-IIII--III-IIII-IIII-IIIIIIl-III III-lI-IIIIIIIIIIIl-III-III..-III-IIIII-IIIIIIII-- Below, circle one of the items separated by / in each set. From the curve, L's hp is at least / at most 60.5°, and the original mixture was about 25 / 30 / 35 / 40 / 45 % H. -2- (2) Both Water and Acetic Acid have strgng H—bonding in the liquid state. W has an abnormally high (lsvap, but AA'S (3§;ap is abnormally low. Using <25 words, explain this difference in terms of the nature of their yapgrs. (3) A pure organic liquid shows strong 3C=O, i.e. carbonyl, ab— sorption in the IR. But the spectrum also shows that all the H's in the compound are bound to Sp3—carbon. Name or draw two ::C=O—containing functional groups excluded by this result. (3) de C, MW = 108, d = 0.80, is steam distilled at Pexternal 760 torr. If P°W<ater> = 600 torr at the mixture's bp, calcu— late the volume ratio in the distillate. (2) W(ater) and odorous cpd D are mixed. Two liquid phases exist at equilibrium—-one is 1.0 mole % D, the other is 5.0 mole % W. Assuming that in each phase, Raoult's Law applies to the majority component and Henry's Law to the minority one, give Ptotal for the D—rich phase, in terms of P°W and P°D. 3 Ptot, D-rich phase 10 ‘ , 11. (2) Six hundred grams of an 0 , calculate how much DA assume all the w is removed. For a DA of is needed to (c)(2) As 2 increases, the FUE for (b) compared to (a) (circle one)—— decreases, which is better. decreases, which is worse. increases, which is better. increases, which is worse. 13. (2) J has mp = 100°, and L has mp = 130°. The most probable mp for a mixture of 90% J and 10% L is (circle one answer)—— 75° 95° 99° 103° 115° 127° 135° -4- 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 data say about the likely composition of X; give reasoning. 15. (5) A solid sample comprises 9.0 g P and 5.0 g Q, whose solubili- ties in a solvent S 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. (D)(2) Arter (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. 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- state these data in solubility terms. Refer to a temperature, the nature of the solution (dilute, conc, saturated), and give solution composition as the mass ratio of glucose:water. -5- 17.(10) Recall the preparation of n~BuIz acetone n—BuBr + NaI ————————€r- n-BuI + NaBr MW = 137 FW = 150 MW = 184 d = 1.27 d = 1.61 (a)(5) Suppose one starts with 4.31 mL n—BuBr and 7.5 g NaI. Calcu- late how many 9 n~BuI corresponds to a 75% yield. Ln3Ln ‘LfllUfiLI‘L'ng. nxplaln CHESS IESULCS, u81ng cnemical equations and not more than 35 words of meaningful commentary. 18. (6) (1) (2) (3) (4) (5) (6) (a)(3) (b)(3) Note the data below: Reagtign z§§ lknall n—Bu-Br --~“> g—Bu+ + Br" + 178 NaI -———> Na+ + I“ + 164 g—Bu+ + I‘ —-——> g-Bu-I - 171 Na+ + Br‘ -~——> NaBr - 174.5 NaCl -———> Na+ + C1‘ + 183 n-Bu-Cl --——> Q—Bu+ + Cl‘ + 185 Calculate l3§gverall for the reaction: n-Bu—Br + NaI ‘—-—) n_n11-T th‘l‘a; nn ‘In‘l‘lY‘ n21r‘1112k1'nn .1. 'Nl’zanwa Keq for the reaction of (a) above is >100, but its rate is near zero without the solvent acetone. Tell in <25 words, may acetone facilitates the reaction githgnt changing (ya overall. No credit for tautology, e.g., "it's catalytic", "it helps the reaction", "goodness is better than evil because it's nicer". ...
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This note was uploaded on 10/12/2009 for the course CHEM 322AL taught by Professor Jung during the Spring '07 term at USC.

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322as09_plq1_blank - CHEMISTRY 322a;r M We QI'QCIQ‘C-L...

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