Feb2010MCAns

Feb2010MCAns - 501.le 0N5 Chem 1050 February Test Saturday...

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Unformatted text preview: 501.le 0N5 Chem 1050 February Test Saturday, February 27, 2010 2.5 hours Multiple Choice Section Section code 000 Exam code 000 Message from the Dean: A|| answer sheets are subject to a common data analysis which identifies anomalies of statistical significance in the selection of right and wrong answers by pairs of students. The course instructor is required to report all statistically significant results which suggest that cheating may have occurred. A“ such incidents will be subject to further investigation. A“ proven cases of cheating will be subject to severe academic penalties. If you are currently seated near someone with whom you studied, and you think you may choose many of the same answers as that person, please raise your hand now and ask a proctor to reseat you. This test contains 24 multiple-choice questions, each worth one mark, and 6 short- answer questions, each worth two marks. Be sure you have a complete test paper. Scrap paper, a periodic table, and data are attached, and they may be detached. Place your student ID card on your desk. The only permitted calculator is a Sharp EL-51OR(B). No other electronic devices may be in your possession, even for timekeeping purposes. A molecular model kit is permitted, but the sharing of models or model pieces is strictly forbidden. You are welcome to keep the question booklet and any scrap sheets. Proctors and instructors will not interpret, translate, clarify, or explain questions, nor will they confirm, verify, or assist you with your answers or your thinking. Therefore, you are not permitted to ask any questions related to the content of the test. There is no extra time allotted for filling in the Scantron. After 2.5 hours, everyone must put their pencils down. The Scantron, whether completed or not, will be collected. Under no circumstances will this booklet be used for marking purposes. The answers on your Scantron are considered to be your official answers, so please ensure that you complete your Scantron accurately, and prior to the end of the test. Answers that cannot be read by the Scantron computer will be marked as wrong. If you do not leave before the last 15 minutes, you must stay in your seat until you are dismissed. NO TALKING IS ALLOWED AT ANY TIME. Chemistry 1050 February Test, 2010 Page 1 1. How many molecules of ibuprofen are present in a l 200 mg tablet of ibuprofen? mOH A) 5.83x1020 "‘0’ = £3 0 B) 1 03 x 103 “Gama! " ' 6 H o C) 6.36 x 1020 = 0.000970q l3 1% 2. D) 6.20 x 1026 E) 5.69 x 1026 molt culls = 0.0009709 Xé-DJQC 10°13 = 5-64 we” 2. Based on general trends in electronegativity, 2 which of the indicated bonds in efavirenz, an H / / antiretroviral drug, is the most polar? N B) 4 C) 3 WA (1 - (1 (L70 D) 2 ’ E) 1 a ‘N m 4‘3 3. Which functional group is not present in efavirenz? 773g drag? Labial-pk, m a: B Alkyne )5 i a ’2“ or M Mr C Alkyl halide " ) ) D) Aromatic rin (Wdl'n 0h ska ) g 0/ #4 [Legion look and Chemistry 1050 February Test, 2010 Page 2 4. How many of the molecules in the box do not contain any sp3-hybridized carbon atoms? B) 1 C) 3 D) 4 E) 5 5. Which one of the following molecules has no net dipole moment? 4,) G 6:. M M A) CH2CI2 Q" . / \ [all I. ' ' B) 03 ’1' I L ' C0- ‘. . .95 Po C) CH30CH3 0‘ ) D H2O EN fth b HG;D\QA / \ a 3 H H 6. A propane-powered taxi burns 60.0 kg of propane, CH3CH2CH3. If we assume that the only compounds found in the exhaust are CO2 and H20 vapour, what volume of exhaust is produced at 100.0 kPa at 30 °C? (Assume ideal behaviour.) (guy so.) —3 5th1 + Mao B 9.55x103L c 3.43x1o4L mo] 65H: '- 99” = lli‘wfl/ ) ) I D) 6.12x104L H4 Md 7 E) 7.95x104L .'. mo/ W4 2 55304 ‘L v -- 2%]: = 4545.5 mar. —_. list/5.5 x 83: 4x 303 100' 0 5 = 440494 L = ct-Hloxio L Chemistry 1050 February Test, 2010 Page 3 7. 5.00 mL of methanol (CH30H, density 0.792 g mL'1), which has a known heat of combustion of 22.66 kJ 9”, were placed into a calorimeter and combusted in the presence of excess oxygen. The temperature of the calorimeter, including the water, increased by 1.45 °C. flambua-Hon .'. A” is — va _ The combustion was repeated except the methanol was replaced With 5.00 mL of olive oil, which has a heat of combustion of 39.78 kJ 9”. The temperature of the calorimeter increased by 3.00 °C. What is the density of olive oil in units of g mL'1? f =‘JJLH; £36" x :- 2 “"47— =7-69-73 are x I45 0: 61-88 #72:" “01:3 Olive 0'! ,‘ AH: —3q_78 lard-l = — 4 AT . = ‘ (ol'fi'b AT'e" x 55-006. = - I357 {J ‘165'7 = £384 x W55 = 4-0676 .'. dmsi = M7 3 5.00.37 = 0°933 amt. -) Chemistry 1050 February Test, 2010 Page 4 8. Which one of the following equilibria lies furthest to the right under standard conditions? A6; = flfl K B) 4002(9) + 6H20(g) ‘—_- 2C2H5(g) + 702(9) AG° = +2833 kJ C) ADP + phosphate : ATP + H20 AG° = +305 kJ mol'1 D) H20 ..——- H” + OH" KW=1.0><10'14 E) CH3COOH —.——- H” + CH3COO' K3: 1.8 x 10'5 7-0054 -ve Ab'M .fwflwsv‘ 7’0 #4 (VJ/'3" 9. How many different constitutional isomers are represented by the line diagrams shown below? c’ ‘ l Y0 DJ 0 VEVV CDO‘IMOO m Chemistry 1050 February Test, 2010 Page 5 10. Which IR spectrum corresponds to this compound? 1 A) OH F d— \ J’f-ahfi- {a -\ A1. IL. ~. I; K r I II“: " .-. IN" 'r ~. I III 0 _ H I, \l I! u I. If "I If Ir 5/ x. _ I r r I W I I} F _ 5 x k r” \ r E II. I] I "I I w‘ “I 4’3 / ~ “‘ 5’ a . ‘ NI J H; k a = o JA'N V W W "R If -'- WlI—III :f—nUI-JH If...“ \ ( . . . . I . . I . . . I . . . . . . . I . . . . . . . I 'IIJ.U :UUJ ELI. 1.: IJ .JJJ :IJ. i'l'lflU'E E" I Chemistry 1050 February Test, 2010 Page 6 H1'JEMII1!EF ll Chemistry 1050 February Test, 2010 Page 7 11. Which one of A — E is the same chemical compound as the one shown below? CH3 Build H Pew. M H C' jet-flan. New 73rd H CH2CBH; Ten alum 5+ 5' wHA-flt row} 6 JD "‘76 «lg UJIII _. am. 0' 12. Which of these statements about chlorocyclohexane Is/are correct? 0/ 1. It has one unit of unsaturation. w 2. When it is in a chair conformation, the substituents on adjacent carbon atoms are staggered. V 3. It has two interconverting chair conformations of equal stabilityx / '79.! molten/3 was B Bonly Menfi a C ) “a”d3°“'y cA/nch/OMXW D) 2 and 3 only a I y E) All statements are correct 3 my Chemistry 1050 February Test, 2010 Page 8 13. Which one of A — E is the most stable conformation of the compound shown below? Br ;’L as a Br hot n; 'ern 4‘1”) \v 74- b 588 79x8. WV Br @h/m mafia/3 Br Br A) Br B) BEZXZEPF Br Br Br Br B r °’ °’ r Br Br Br Br E) Br Br Chemistry 1050 February Test, 2010 Page 9 14. Which of these statements about vitamin A is/are correct? ll/fx/I/O H no:‘ #4 4:4 1. Allfive alkenes exhibit cis-trans isomerism A 'n m r]? I 2. It contains a carbonyl group. V 3. It does not contain any stereocenters (chiral centers) l/ A) 2 and 3 onl B 2 only C D E 1 and 2 only ) ) ) 3 only ) All statements are correct 15. What are the E/Z configurations of the alkenes indicated below? 1 2 3 E E Z B) neither E Z C) Z Z Z D) Z Z E E) E Z neither Chemistry 1050 February Test, 2010 Page 10 16. In how many of the following is stereoisomerism not possible? DOW OLOOA ) ) ) ) E (all four exhibit stereoisomerism) 17. Shown below are five structures of the amino acid alanine. How many of them have an 8 configuration? 4 3 2— H CH3 COOH ‘ 4v 1 \ H2N\“‘ 3 H““ H2N““ “‘-~ 5 H000 CH3 H2N COOH H CH33 1 ‘l' 1 2. l COOH NH2 I \\ 2' \\)\ '3 H2N “ HOOC H3C Hq. H CH 03 599V mL—xco Chemistry 1050 February Test, 2010 Page 11 18. What is the configuration of each of the indicated carbons in the sugar sorbose? CH2OH \ O Ania/er each H OH chiral G in [fl/Ox H Mn; “.55.! h 2 H OH - ' ~ PNDM'HJSJ 3/CH2OH drjgmjuams 1 1 2 3 R s R B) R R s C) s s s D) s R s E) R R R 19. How many stereoisomers are possible for the structure with the bonding sequence shown below? (Of all of the possible stereoisomers, just one of them is Vitamin D2.) HO 1! if Chemistry 1050 February Test, 2010 Page 12 20. Which of these statements is/are correct about equilibrium constants? \/1. At a given temperature, the equilibrium constant remains constant despite the addition of reactants or the removal of products. \A. The equilibrium N2(g) + 3H2(g) 2 2NH3(g) shifts to the right when the volume of the system is decreased at constant temperature. * 3. The equilibrium constant for an exothermic reaction increases when the temperature of the system increases. A 1 and 2 only B 2 and 3 only C D E 1 and 3 only ) ) ) 3 only ) All statements are correct 21. How many litres of water are required to dissolve 0.10 mol of BaSO4 (KSID = 1.5 x 10'9), the compound used as a contrast agent in x-ray imaging? (A) 2.58x103 ) &504(s) 7—13 '1' with“? B) 6.67x107 1. o 0 J C) 1.39x1o2 m , D) 1.29><1o3 AD" ‘ 1 7‘ 7‘ ) (I ,_, s’ :5. r—q 33. Lb E 6.93x101 I: Chemistry 1050 February Test, 2010 Page 13 22. A concentrated solution of HCI is added dropwise to a 100 mL solution of 0.010 M Pb(N03)2 until the first trace of PbCl2 (KSID = 1.7 x10'5) is seen. What is the concentration of Pb2+ and CI" in the solution at this point? Assume that the volume of the droplets is negligible. = 0 ° C! O M [Pb2+] [Cl—1 a 0.010 0.041 9) 0.010 0.017 0 = 2. C) 0.010 3.0 x 10'4 [QP : -] D) 0.026 0.026 _ 7. E) 4.1 x103 4.1 ><10'3 0" "7ND s= (0'0’03 Lce {l = o-o4iM 23. Which of these statements is correct about the equilibrium experiment, where Fe(N03)3 and K(SCN) were mixed together? '/1. N03" and K+ are spectator ions. \/2. The concentration of the product can be measured spectrophotometrically. Vx 3. The linear relationship between the concentration of the product and the amount of light absorbed is called Le Chatelier’s Principle. - '73}; 7s #1 3¢er W144! A) 1and2only B 2 only C D E 2 and 3 only ) ) ) 1 and 3 only ) All statements are correct Chemistry 1050 February Test, 2010 Page 14 24. Which one of the following statements about the qualitative analysis experiment is not correct? a an solubil- 7a A) The cations of alkali metals can be identified by precipitation. VB) The experiment is qualitative because only observations, and not measurements, are recorded. (/0) Ag+ can be identified by precipitation as AgCl. VD) It is not possible to identify nitrate by precipitation with a cation. VE) The oxidation products of bromide and iodide are different in colour. R values 0.0821 L atm moI” K” 0.0831 L bar moI” K” 8.314 L KPa moI” K” 8.314 J mol” K” 8.314 kg m2 5'2 mol” K” 1atm=101.3kPa 1LKPa=1J 1Latm=101.3J K = °C + 273.15 — 3RT P+ "2 (V b)- RT urms — MM aVZ Tl — Tl AG° = -RT|n K 5’25. .. "IE nae. 2,8 2: 2a 2.11! T L. w .. E” 3 Lu 5?? 23 - 'I 23 ...
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Feb2010MCAns - 501.le 0N5 Chem 1050 February Test Saturday...

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