Dec2009MC000Ans

Dec2009MC000Ans - (A)me 50:. an" cw 5 Chem 1050...

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Unformatted text preview: (A)me 50:. an" cw 5 Chem 1050 December Exam Thursday, December 17, 2009 Three hours Multiple Choice Section Section code 000 Exam code 333 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 exam contains 30 multiple-choice questions, each worth one mark, and 5 short- answer questions, each worth two marks. Be sure you have a complete exam 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-510R(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 exam booklet and any scrap sheets. Proctors and instructors will not interpret, translate, clarify, or explain exam 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 exam. There is no extra time allotted for filling in the Scantron. After 3 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 exam. 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 December Exam, 2009 Page 1 Before starting the test, please bubble in your: > Exam code > Student number 1. Consider the quantum numbers n = 2 and m8 = +1/2 . What is the maximum number of electrons in any given atom that can have these two quantum numbers? :— “=°? ’ we 0.14 Only one. 5 and 795033 7 mb'*d§ B) 8 ' c) 1 In a. II len’ Ofbn‘a./J 0" 4’ one' D) 2 e/ccz‘rans has "’5 = "" yz E 3 , l . . 767w o/C 4 elect/ran: 2. Which of the following species is not isoelectronic with a noble gas? ® I) nail: a: has an 539‘ B) Ai3+ eon/[aw 'm 4 2+ ' ' a C) C_a 513‘- ]: 35 D) F E) 02' 3. Which one of the following has the electron configuration 132 232 2p6 332 3p6 3d4 in the ground state? ya] # 6 ~ = - Jae- Chemistry 1050 December Exam, 2009 Page 2 4. Which of the following statements is/are correct concerning atomic nitrogen and atomic carbon? K 1. The first ionization energy of C is greater than that of N. X 2. The electronegativity of C is greater than that of N. X 3. The atomic radius of N is greater than that of C. None of the statements are correct B) C) D) 1 and 3 only E) 2 and 3 only 1 only All statements are correct 5. Which one of the following statements is correct with respect to the molecule |C|5 (iodine pentachloride)?£ :— Wand T = 7* 5 = ac _ = 6 ,1»- The geometry of the regions of electron density (electronic arrangement) is octahedral. O: ,type B) The VSEPR type of the molecule is AX5. )3 “3;” C) The shape of the molecule is octahedral. 6 ’, . . . _ 5 I n” 5"”! f5 D) The hybridization of the central atom is sp . E) The molecule is nonpolar. SD 9- E l a. Jeanie fifanmfd 6. Which of the following statements concerning 7: bonds is/are correct? 5‘ 1. A 7: bond is always an antibonding orbital. X 2. A 7: bond is formed by the head-on, on-axis overlap of two p orbitals. V3. A 7: bond contains one pair of electrons. B) 2 only C) D) All statements are correct E) 2 and 3 only 1 and 3 only Chemistry 1050 December Exam, 2009 Page 3 7. Based on molecular orbital theory, which statement about N2, N2“, and N2", is Correct? N"I has /0 valenu 4 3 a1] loaf/eat. NJ has 44‘ J NJ‘ has I! e- ®They all have multiple bonds, but only N2+ and N2' are paramagnetic. B) Because they all have multiple bonds, they are all paramagnetic. C They all have multiple bonds, but only N2+ and N2" are diamagnetic. ) D) They all have multiple bonds of the same bond order. E) None of them have any 6 bonds 8. A sealed, 1.00 L container contains 5.00 g of an ideal gas at 1.00 atm and a temperature of 300 K. The temperature is increased to 450 K while the volume is held constant. What is the density of the gas at 450 K? -I _1 0': 5.4903 = 5_DDJ/_ A) 5009 L I—f‘ook B) 7.50 g L'1 C) 3.33 g L'1 J] Ila/um IWAS flange/D)! ) ) D 1.509L-1 den shy a“: no”. E 6.50 g L'1 9. Consider the combustion of gaseous acetone, CH30CH3, in oxygen to produce only CO2(g) and H2O(g). The initial pressure of acetone is 65.0 kPa and the initial pressure of oxygen is 150 kPa. What is the final total pressure of the gaseous mixture after the reaction is complete and the volume and temperature have returned to their initial values? a film: an owe-30 eaten +344 0 3 3 a. o 06' B) 250 kPa 3" 65‘ o '50 C) 215kPa ab: 65" £9 0 '00 Ibo D) 385 kPa 3 E) 300 kPa = \‘5 Chemistry 1050 December Exam, 2009 Page 4 10. Two identical containers are filled with equal numbers of gas atoms, one container with He and the other with Ar. If the root-mean-square speeds of the gases in the two containers are the same, what must be correct about the temperatures of the two containers? I! {Ivy-5 9/ Ms " 15714 8:15 Awi/I MM 0. f rm: ca. m The temperature of Ar is higher than the temperature of He. 5P¢¢d5 are. B) The temperature of He is higher than the temperature of Al‘gM/J fl“ C) The temperature of Ar is the same as the temperature of He. mv’e’fés . mus! 4: a D) The gases must mix before the temperature of each gas can be determined. E) There is insufficient information provided to determine the relative Awe, temperatures of the two gases. 'JCNP’ 11. One mole of each of Gas A and Gas B at temperatures are placed in a container that is separated by a divider as shown below. The gases are allowed to come to thermal equilibrium, but they do not mix. GasA Gas B (1.0 L) (2.0 L) When thermal equilibrium is attained, which relationships is/are true? I O 0 an _ FBI/B 4+ qwl‘br’wr} 11,) n3 1 = 75 ‘l _ , ‘6 2. PA : PB 3 = 92%) n - an «a =‘I'K'B 3. VA 2 VB B) 2 only C) 3 only D) All relationships are true ) None of the relationships are true Chemistry 1050 December Exam, 2009 Page 5 12. A 50.0 g copper pot contains 75.0 g of water. Immersed in the water is a 40.0 g silver spoon. What is the heat capacity of the pot, water and spoon combined? Specific Heat Capacities (J g"1 °C'1): H20 4.184 Cu 0.385 Ag 0.233 75¢] = [mad at 0-335 3"?) B) 4.80Jg'1°C'1 4. (75.0& 4.134% a o -1 -l.-I C) 403 J .01 -1 -r (tic-00¢ x 0-333? a) D) 3.96Jg °C a _’ E) Cannot be determined without knowing the temperature : 13. 50.0 kJ of heat energy are added to a system, and it is allowed to expand from a volume of 1.50 L to a volume of 5.00 L against a constant external pressure of 1.15 atm. What is theAEofthe system? Ayrnsaoo _ [.50 =3.50L o'. u.) =- —(/-/5aJm x 3'50L) B) +92.0kJ = _ 4.0.25L ‘ g 40.7.8 7. C)0kJ _ D) +5o.5 kJ 2 = SO'OAJ " 5D) 0007 E) +908kJ A5 1.2+“) =3QmOU-4O7-SU' = 495937 = 49.6 It: 14. A closed container with a moveable piston at one end contains an ideal gas. The gas in the container undergoes an isothermal expansion. Which of the following m statements must be true about this process? . ‘7. . at”? b mama-1‘ The internal energy of the gas does not change. QM B No heat enters or lea es the conta'ner. ’4 )) V ' Loaf/x 15 ane) 50 4 .. X D) The volume of the gas does not change. mus h d ) x E The pressure of the gas does not change. 1061 M ram narrows I' 5 \C C No work is done by or on the container. Chemistry 1050 December Exam, 2009 Page 6 15. What is the relationship between enthalpies p, q, rand s? B 3(5) + H2(g) 9 H2S(g) AH=p «9.3 H20) + V2020) 9 H200) AH=q 3) 8(8) + 02(9) 9 302(9) AH=r 4) H280) + 3/2020) 9 H200) + 802(9) AH=s I) 33.75%: desired an. (M :13) )p=s—q-r a) 3; ok .'.AH= 1 C)p=q-r-s 5 5: 0k .‘. M = r' )) 43 mus} b1. rel/«$4.1 M 3 ‘5 .10: 4.3.4 m- 16. When a sample of liquid benzene, CsHs, is burned in excess 02, 163.4 kJ of heat are produced. Assuming the reaction goes to completion, what is the maximum number of grams of liquid water that can be produced? 721w .' (LII-I6 a.) +5}: 0* —-3- éagfa) 4- BJJa'oLQ) ) AH°f(kJmO|_1): C02(g) —393.5 200) -285.8 06H6(| +490 4,4,“: Agjfual - A came. B) 3.90 ._—_ - , - . — 9 0 C) 5.40 [a as s)+.«7( .285 Q [ ‘I- .7 D>4-40 = 1.24.7 4 xa'mol" n J} E) 1.80 6 b #w 52"}, = “’63' “7 = 0.0500 mo! - 3167-4 Urinal" m0] Hap Prodqu .- 3 x 0.0500 m/ = 0.150 "50“ Mass Heat 0'50 "50/ X mowde " = 4-708 Chemistry 1050 December Exam, 2009 Page 7 17. Estimate the standard enthalpy of formation (AH?) of gaseous acetaldehyde. AH") (kJ mol'1) Average Bond Enthalpies (kJ mol'1) 0 C(g, at) 717 C—H 414 AH H(g, at) 218 C—C 347 0(g, at) 249 0:0 715 fiftigifhyde "Rm: @3414??? -7 5:416:44» Wigfofra) ) B) +2718 kJ moi‘1 13E. = Man = All - Mi «LU-é- C +2555 kJ moi"1 = [AL—"13+ LR” +MJ_MS0 may") D) —2718 kJ moi"1 E) +163 kJ moi'1 = 3555' - . GHéCJtO = - a: = Iii ‘i-‘i-l-"li‘s TEE. WELL-“3 1-12.81 LS+E( (3:2(1 "iii-aamd .1713 -= 4555 Adi 4113010 sum! 0130110: 453%" 18. Estimate the AH of this reacti n using the given averag bond enthalpies. CI2(g) + 2CH4(g) 9 H2(g) + 20H30I(g) Average Bond Enthalpies (kJ mol'1): C-H 413 CI—CI 242 H—H 435 C—CI 330 Brown :- Torde. : B) +88kJ tel-(ll "'- 343 \H—H a 435 C) —110kJJ~%A—H = sag, ac-“ —_ 1990 D) -88 kJ w E) +27 kJ ‘0 I" % \o ‘1 '5 Afirmz E Chemistry 1050 December Exam, 2009 Page 8 19. The sign of A8 for the following reactions are, respectively: —-\I¢.2 Al(s) + 302(9) 9 Al203(s) 3mg] a, 0 mo! €43 wit—203(9) 9 302(9) .1 rho/(70.5 -§ smo/ dfl-S All 00(9) + 1/202(9) 9 002(9) [.5- rho/flats a / nod {‘5 egative, positive, negative B positive, negative, positive C D E ) ) negative, negative, positive ) positive, positive, negative ) negative, negative, negative 20. Determine the standard entropy change (AS°) for the reaction below. 082(9) +‘fH2(g) a CH4(g) flHzS(g) 8° (J moi” K”): 082(9) 151.0 H2(g) 130.6 CH4(g) 186.2 H28(g) 205.6 C . b : 0d - 3 mac. 1% 59" M) B) —110 J moi" K” = [iwoa -I- 2505-5))" [‘5' '0'!" C) +151 J moi” K” .4 D) —225J moi” K” = "7‘9 j- K E) +236 J moi” K” 21. Which one of the following reactions, when carried out under standard conditions, has a Gibbs free energy change corresponding to the Gibbs free energy of formation, AG°f, of the product? \/A 2Al(s) + 3602 02H2(g) + 2 H2 ) ) g) 9 A|203(S) ) *8) g) a CzH6(g) 4,4, naf an W7" $0) H200 + 1/202(9 9 H2020) Ago 5D) C g,at + O(g,at a CO(g) W na‘ stai A E) K ) s + 1/2 l2(g) + 2 02(9) 9 KIO4(S) é. no! dart/aid 51d. AA VV ( ( Chemistry 1050 December Exam, 2009 Page 9 22. Determine the AG° for the oxidation of ethanol to acetic acid at 25 °C. CH3CH20H(|) + 02(9) 9 CH3COOH(|) + H20(|) AH°f(kJ moi”) 8° (J moi” K”) CHgCH20H(|) -288.3 CHgCH20H(|) 148.5 CH3COOH(|) -485.8 CH3COOH(|) 178.7 H20(|) -285.8 H20(|) 69.9 02(9) 205.0 - “’0 = A”. ‘ T “1 m, A) — 452 kJ moi” o _ o _ ‘ Au - A Prod 1* C) +307 kJ moi” = [- - D) -657 kJ moi” =. E) +2139kJ moi” AS" _._. S'Prad _ {Luna Aé°= ~ Lisa .3 LI— amt; K (— «moo—m kTK‘) -452" o —1 —1 —1 23. Consider a reaction with AH° = 175 kJ mol and AS° = 350 J mol K . What is the minimum temperature, in K, at which this reaction will occur t I? Spon aneousy M,” (o n st-taneo—L: rich Sta—4' LC: =~60 = AH~‘TAS. ) i137 o = i-i'; kTmOl" — T (c.3anol"K" ) T = 500 K Chemistry 1050 December Exam, 2009 Page 10 24. Which one of the following statements correctly describes a three-centre, two electron bond? hree atoms are bonded together using a total of two electrons, with one atom bridging the two others. x B) The two electrons in the bond are equally distributed over the X, y, and z axes. X C) The two electrons are delocalized over three degenerate molecular orbitals. )( D) The wavefunction of a bond that contains two electrons and has three resonance structures. X E) The two electrons resonate between a spin of -1/2 , O and +1/2 . 25. Which one of the following is NOT an allotrope of carbon? A) Carbon dioxide B) Graphite C D Buckyball E) Carbon nanotube ) ) 26. Which of the following statements concerning the structure and/or composition of the Earth’s atmosphere is/are correct? ‘/1. The vapour pressure of water increases with temperature. W. Acid rain is partly the result of the presence of NO or N02 in the atmosphere. 1/3. Stratospheric ozone absorbs UV light. A) All statements are correct B) 2 and 3 only C) 1 and 3 only D) 2 only ) E 1 and 2 only Chemistry 1050 December Exam, 2009 Page 11 27. The following can be classified as what type of chemical reaction? CH3 CH3 CH3 2HO—5i-OH —"'* HO—Ci—O—Ci-OH + H2O CH3 CH3 CH3 #40 is (mm/ed B) Hydrolysis C) Neutralization D) Hybridization E) Resonance 28. Sodium azide, NaN3, is an important component of airbags. When an airbag is deployed, the NaN3 is heated, resulting in its decomposition to nitrogen gas. A second reaction converts all the sodium that is produced into Na20, which leads to the formation of more N2. 2 NaN3(s) 9 2 Na(l) + 3 N2(g) 1ONa(l) + 2 KNO3(s) a 5N320(S) + K2O(s) + Me) If an airbag initially contains 145 g of NaN3, how many litres of N2 will be produced when the airbag is deployed at 125 kPa and 45 °C? Tram 4}»: ‘3'! combined read/ms: I «sol Ala/Y3 felt/5 /-6r~nfl’/\é B)60.0L N N _ "ls. c)68.0L “’0’ a a ‘55-— ,-/ : 4-95 me! D) 189L J E) 94.0L . co Ne = v = 7&7“: 3-566 x s-sl4x3ls 7b 135 = 75-51.. Chemistry 1050 December Exam, 2009 Page 12 29. In the Molar Volume of Nitrogen experiment, why was it necessary to measure both the temperature of the liquid and the temperature of the gas? \/A) The molar volume depends on the temperature of the gas, while the vapour pressure depends on the temperature of the liquid. 3C B) To determine if thermal equilibrium had been achieved. 5k C) To correct for the temperature difference between the gas and the water. X D) To correct for the pressure difference between the transferred water and the gas in the flask. X E) It wasn’t necessary; it was just good laboratory practice. 30. In the Thermodynamics experiment, in which the heat of neutralization was determined, which statement best explains why was the experiment performed in a styrofoam container instead of a glass beaker? \ A Glass is a better conductor of heat than is styrofoam. ) Glass reacts with the reagents used in the experiment. ) B C) Styrofoam is unbreakable. D) Styrofoam is biodegradable, but glass is not. E xwka ) Styrofoam is not transparent, but glass is. 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 = 101.3 kPa 1LKPa=1J 1Latm=101.3J K = °C + 273.15 3RT urms : W T: 2.r=.. fl 9 LTJ 2.3 ( n P+a— to, 2 V2 2pI 23 >(V—nb) = nRT ...
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Dec2009MC000Ans - (A)me 50:. an" cw 5 Chem 1050...

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