DecExam2008

DecExam2008 - Chemistry 1050 December Test, 2008-09 Page 1...

Info iconThis preview shows pages 1–17. 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

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

View Full DocumentRight Arrow Icon
Background image of page 8
Background image of page 9

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

View Full DocumentRight Arrow Icon
Background image of page 10
Background image of page 11

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

View Full DocumentRight Arrow Icon
Background image of page 12
Background image of page 13

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

View Full DocumentRight Arrow Icon
Background image of page 14
Background image of page 15

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

View Full DocumentRight Arrow Icon
Background image of page 16
Background image of page 17
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Chemistry 1050 December Test, 2008-09 Page 1 Before starting the exam, be sure that you have correctly entered: 0 Your student number 0 The exam code on the front cover 1. When 7.36 g of a compound containing only C, H, and O was burned completely in excess oxygen, 10.2 g of C02 and 8.28 g of H20 were formed. What is the empirical formula of the compound? mo! cg = we; :o-Jalg .—. mom We: a!" “w B) Cszo mass a = o~ Ismolxuoldmor' = 3-78! 3 C) C4H8O m, = = 0.4546 D) “402 more “mm - 0-9/4; E) C2H4O 'v--—~—- mass H =09! announces I-I =o.gesg Inns: 0 = 7.36 -(J-7s'7’+9-9.1655 = mm 0 =I3:g°49§°’~’ : 2.333, mo] H W 01 0.44mi: oasis w-MJN-m' =7 4 +0 2. An aqueous solution of the strong acid HN03 contains 4.00% HN03 by mass and has a density of 1.03 g mL'1. What is the pH of the solution? 100 min can-Iains $006 HN05 0/ -I C) 1.16 630,85 D) 0.16 Val 13/!) =' ’003 _ = 97-D?mL E) 0.20 I-03 'nL ’ [HA/o] = 0.0635'rn0/ = 0.654H =[f-j‘fj 3 9.09709 L. .'.pH = 0484 —. Chemistry 1050 December Test, 2008-09 3. ’ ’7 M258 Page 2 If an aqueous solution of sodium chloride has a molality of 5.00 and a density of 1.17 g mL'1, what is the molarity of the solution? .5de codeine 5.00 Mal B) 4.27 ___._ 494.1} C) 5.85 D) 330 W88 Sal-n. = IOODJ 1' $61-$18 E) 3-98 = [39.1.3.3 Vol win: 1394.; ~ "04.4mL l-I7 mL. -' ~ 5' 0° "‘0’ = 4.53M NaC'I = I J LIOIWL. ‘— Which one of the following ground-state species has the largest number of unpaired electrons? MJ45°3ds JWM e- 8) Cu” In] 45" ad? - I " " C) Zn2+ 59,3 450 3dl° - o u u [E))) 59‘] 4s°sd°~ - a. " " [NeJBaABf' - I " " Nad/ = memo/ Mir-44 amo’ " Chemistry 1050 December Test, 2008-09 Page 3 5. Based on periodic trends, which of the following statement(s) is/are correct? 1 1. K+ has a smaller radius than Na+ ‘L 2. Cl has a lower electronegativity than Se I 3. Mg has a higher ionization energy than K B) 1 and 2 only C) 1 and 3 only D) All statements are correct E) 1 only 6. Which one of the following is the best representation of the correct Lewis structure for Br03'? Chemistry 1050 December Test, 2008-09 Page 4 7. Which statement(s) is/are correct about the ion CH3+ ? ‘/ :de = 4 +3 " I = Q 1. It has no net dipole moment V2. It has an empty 2p orbital perpendicular to the plane of the molecule X 3. It is ofVSEPRtype AX3E1 6: - _ , hon -'- 1% mm“ 4 B) 1 and 3 only . "' - r- C) 30nly 79/7qu W; D) All statements are correct -‘ CLIVL d #DIW 15 f E) 1only hyér/ fad 0.0 / "Pure ‘ lo mhh‘ 8. Shown on the right is styrene, which is used to make H chxH polystyrene (styrofoam). Which statement(s) is/are I H correct about styrene? H C C / x \(fi \xc xH 7x 1. It contains exactly 12 o (sigma) bonds C (I: 3 . . r “x I? \— fi 2. All carbon atoms are sp -hybrIdIzed H C|3 H V3. All carbon atoms in the 6-membered ring, along H with the 5 hydrogen atoms and the 1 carbon atom bonded to them, lie in the same plane A) 3 only B) 2 and 3 only C) 1 only by [rid/zed. D)1and3only GUAM mm: M 7 E) 20”” 49x3 jam/y; Planar Chemistry 1050 December Test, 2008-09 Page 5 9. Equal masses of the ideal gases Ne, 02, and Xe are placed in separate flasks of equal volume at the same temperature. Which one of the following statements is correct? M - 3.0. [g mol " 0d - 3.? .oo&mol "/ -l h c- ,a’. “I I/A) The Ne flask has the higheast pressure ‘ smlles" X B) The 02 flask has the highest gas density yields lava: é 'Lasafi X C) All flasks contain the same number of atoms or molecules :0 [VJ mane X D) The Xe flask contains atoms with the highest root-mean-square speed P X E) The 02 flask has the lowest pressure £5ng 30“? a ('03,?) *450; f) 10. How many mL of an impure liquid C82 mixture (density 1.26 g mL'1), which contains 93.0% of C82 by mass, must be burned to obtain 5.0 L of 802(9) at 298 K and 101.3 kPa? m, :9, = (m mus-cu - a .404 m.) (sat/:fiyms K) B) 13.3 . C) 265 o o Md 65 = 00/03 FM] 4 D) 9.10 Mess Pure Csd needed =0!de INC-[Sinai E) 18.2 = 7. 7197 a Mass impact; 63“ needed = 7-7676 X fl : 8-35; 93-0 l/o/ = 8‘35 :. 6'63 ml- /_abfiz‘L-I 2 Chemistry 1050 December Test, 2008-09 Page 6 11. A sealed reaction vessel initially contains 50.0 kPa propane gas (C3H8) and 200 kPa 02(g). The mixture was burned, forming only H20(g) and C02(g) as products. What is the maximum mole fraction of C02(g) that can be present in the vessel after the reaction? ,1: w 4 II: )+ 50 S-fiaco \-r 4140) E“ Raga 1:330:04 0‘93 03.? B) 0'429 : 5O - 4-0 0 13.0 C) 0.750 06 '60 -'-" [0 D) 0.535 E) 0.706 -P-Jo+a.l aft—T flax = lO-I- iao+ieo = aqo Xma" i0 : O'4l'+ 9.40 -— 12. Excess oxygen and 1.00 g of naphthalene (C10H8) were reacted in a bomb calorimeter that has a calorimeter constant of 7.80 kJ K”. The heat released increased the temperature of the calorimeter from 25.62 °C to 35.45 °C. What is the molar heat of combustion of naphthalene, in kJ moi—1? = -' d5 = - 7.$D(35o45-"456a) 2"“ - l J B) -76.62 C) -128-2 mol 0,0 #8 = " 0° — enemas D)-9.81 1:18 moi" ‘ E) -5699 H. i A M = —- 76.67 T = —?al4.£731>/" a .0078/a5'mo/ '5’ Chemistry 1050 December Test, 2008-09 Page 7 13. A piece of iron metal with a mass of 40.00 g is heated to 80.00 °C and dropped into 100.0 g of water at 25.00 °C. What is the temperature when thermal equilibrium has been reached? _ q- 1 1 " 2 Te - Map Specific heats (J g" K" ) Fe(s) = 0.446 H20(I) = 4.184 "' [40.003 £0446 :37.de (-5 B) 20.71 = [loo-06 n 4484731? (‘6 - (15-04] C) 55.00 D) 68.75 ‘T = a7. E) 34.38 ‘6 14. An ideal gas expands isothermally against a constant external pressure. If 200 J of energy are required to expand a gas from a volume of2.00 L to 5.00 L, what is the external pressure in kPa? (1 J = 1 kPa L) "7754 efifandl'n as I: doing wmA m4“ WfDMVS. B) 0.0667 C) 0.0800 ,2 a) = - .2007 D) 80.0 E) 600 a) ..-. — .1 AV «1‘ -aooa' = _'?ex+ (SCODL --?-OOL) .o. ?x_l : 66.7 ~€ Chemistry 1050 December Test, 2008-09 Page 8 15. For which one of the following systems is AE > AH at constant pressure? (Assume that the gases behave ideally). If AE- > All, work has [can dane 0n 7%: V A) CH3CH20H(I) + 302(g) a 2C02(g) + 3H20(l) Jab/M X B) H20(s)+ H20(g) .2 «hm hm 3‘ C) Nzo4(g)92N02(g) 6 ? , K D) H20(g)9 H2(g)+ 1/202(g) L ’°m“w X E) H2(g)+ F2(g) 92mg) ‘ ms (flawfi’d' (as: an.on ‘ mac-lam. 16. Using the data provided, determine the standard enthalpy of formation (AH°f), in kJ moi—1, for Mn02(s). I} 4Al(s) + 302(g) a 2A|203(s) AH = —3352 kJ a) 4Al(s) + 3Mn02(s) a 3Mn(s) + 2Al203(s) AH = —1792 kJ 5;»: WWW: ans) + 0.1L 9) -—w Hug (s) I) 04: Hill raoa 9.136103 4353. B)_1560 "Rev- .13: am» 1- 33303-7 #91 raring +1799 o)—5144 all: 3H,, faoa a 5I"/r\0a D)-1715 AH = (_3353)+((7QJ\: -(560&7 E) —4680 Emma 607% gin and AH 5 io_ ad- des/raa’ egg); NJ: —§io_/{J Chemistr 1050 December Test, 2008-09 , Pa e 9 1a.. FYOWM .7; 3r 9,aJ)-fl-Dm 436.?) In: LH: +95.5ng' 17. '1. If Br(g, atomic) forms one mole of Br2(|) and the associated enthalpy change is -224 kJ, what is the enthal of va ourization of Br I in kJ ol' ? py p () I? = 496 _5- LT ’) Z13! )—% 3f I‘J' A 43,)?» e311 .4) w-aw B) +128 . C)_128u)n~7'. 331.1) a, 3; 3 D) +175 I) K1}: 6!!) % 3r M = 493 JJ E) —31.04\x-I: are! )’ a skit) AH =+JQU~KT AH =(—/?s IJ)+ (4» 34L; )0) = 1'3LOkT £1221: jun. {o a.ka W 7 jlrs-I- mm and 5:43qu fossifln. 4:21:15 ) 0 OJ! +Ve. QASuJflS uflm 0-4 ° N 18. Using the data provided, estimated the standard enthalpy of H\ /C\ /H . o . _1 KC formation (AH f), In kJ mol , for gaseous acetone. H 1 l H QXN D : H H (GHQ: CO ——7 3691M» 6/19,“)dong) acetone Bond enthalpies (kJ moi—1) C-H = 414 C-C = 347 C=O = 715 AH°f (kJ moi—1) C(g, atomic) = 717 H(g, atomic) = 218 0(g, atomic) = 249 fined All = £(2candsérohn) - E (Ema/:- in =[g.e(d-C)'fé£(€-H) nub-97 -0 B) -3893 = 46347) + till-Of 7/5 C) -3708 = 3893 ka- D) —206 E)-105 A”: _. 38?3 = [3(7/7)+é(J/8)*J43] ‘ A7 155 = -—-A ’ (Mateo __ _l ALQMPW = MW Chemistry 1050 December Test, 2008-09 Page 10 19. Which reaction has AG° equal to the Gibbs free energy of formation (AG°f)? Jen maéLm 9! / rno/ y ‘/A) “2(9) + ‘/202(9) 9 H20(') 4‘ .¢ 60.1mm 0L /r0m tamed; X B) AI(s) + 3CI(g) a AICI3(s) 4 X C) C2H4(g)+ H2(g) a C2H6(g) In 5401\0'6110’ S “S. X D) C(s, graphite) + 02(g) a C02(S) 3L E) Hg(s) + 02(9) 9 HgCI2(g) 20. Using the data provided, determine AG°, in kJ moi—1, for the following reaction: 2C2He(g) + 702(9) 9 4c02(g) + 6H20(g) AG°f (kJ mor1 ) C02(g) = —394.4 C2H6(g) = —32.9 H20(g) = -228.6 0 _2883 44‘ = M‘ M - AG‘ .41“. B: -2095 :7 4.337;)- [4 (. 51,43] C)+118O = _a%33.4 n. D) —1180 E) +2095 21. All three reactions shown below are spontaneous at standard temperature and pressure. Which reaction(s) is/are entropically driven? lam in chair-of)! V1. coz(s)ecoz(g) (s) —7 ) 5‘ 2. 2H2(g)+02(g)9H20(l) 3 ma] 3 —9 (-4-) K 3. C2H4(g)+ Br2(g)9 C2H4Br2(g) aw] Q B) 2 and 3 only C) 2 only D) 1 and 2 only E) 3 only Chemistry 1050 December Test, 2008-09 Page 11 22. Which of the following statements is/are correct? K 1. A process with AG = -50 kJ mol'1 will always occur faster than a process with AG = —25 kJ moi”. . X 2. When ice is melting at 0 °C, the value of ms is zero. 0 c : 473% 1’3. If a process has a positive AG value, the reverse process is spontaneous. B) 2 and 3 only C) 2 only D) 1 and 3 only E) All statements are correct 23. Using the data provided, determine the lowest temperature, in K, at which the following reaction will be spontaneous: CaCO3(S) 9 C02(g) + CaO(g) AH°f (kJ moi”) C02(g) = —393.5 CaO(s) = -635.1 CaC03(s) = —1207 A8°f (J moi” K”) C02(g) = +213.6 CaO(s) = +39.8 CaC03(s) = +929 AH - [4115+ {-635.13} [-Iao‘7) B) 555 -'-" l78-‘I- U = 1784007“ (3)4114 A5 = [413-6 + 39-81- 93-? D) 2057 E) 298 = 1605' 7 AH - TAS 178400 “Two-5) 7': ////-§4’ Sat 46. = O Chemistry 1050 December Test, 2008-09 Page 12 24. Ethanol (CH3CH20H) has a boiling point of 78.5 °C and an entropy of vapourization of 121.9 J mol'1 K'1. What is the enthalpy change, in kJ, when one mole gaseous ethanol at 78.5 °C is condensed into liquid ethanol at the same temperature? cfiémao’q a 04.3wan ) = Ill-mr'K‘l @3049" (gha‘tugou i) As: 'laI-flnd"4(" B) +42.8 C) 0.00 a = TA 5 q) D) +0123 = (‘78-5 T373)("a’° E) —0.123 -_- -43548 U-mol" = - “.3 [(de " = 25. Tetraborane(10) contains only 2c-2e bonds and banana bonds. If it contains exactly seven 2c-2e bonds, how many bridging hydrogens must be present? 34H“): die" = 4(a)+lool=Jae- B)8 7 old-024' band: M [43- C)6 m sis-1% in 3e-de- «Sara‘s 512 o'. 4 "Lananaufionds 4 Afl'djl'n’ 50¢de S 26. Which aluminum ore is smelted using the Hall-Heroult process to produce aluminum metal? 0) Al303 D) LiAlH4 E) AI(OH)3 Chemistry 1050 December Test, 2008-09 Page 13 27. Which of the following statements is/are correct? X 1. With respect to graphite, interca/ation refers to the conversion of graphite into other allotropes of carbon at high pressures V” 2. The conductivity of silicon increases as temperature increases X 3. At 0 K, there are no electrons in the bonding molecular orbitals of silicon ( A) 2only > B) 2 and 3 only C) 1 only D) 3 only E) 1 and 2 only 28. The compound below is another example of an oxoacid of phosphorus. How many acidic (ionizable) hydrogens does it contain? OHOHOH \/ \/ \x’ P P P HO/ \O/ \O/ \OH B)1 C)4 D)5 E)3 Chemistry 1050 December Test, 2008-09 Page 14 29. The bond lengths in 02, 02', and 022' are 121, 128, and 149 pm, respectively. Which one of the following statements best explains this trend of increasing bond length? fights-I Bond war awry land 167’“ 02 has a largest ratio of bonding-to-antibonding electrons, while 022' has the smallest ratio of bonding-to-antibonding electrons. B) 02 is paramagnetic, which causes the two oxygen atoms to be more closely attracted to each other. C) 022' has an expanded octet, so it requires more space. D) 022' has the largest Bohr exciton radius. E) 02' and 022' are polar molecules, which tend to have longer bond lengths. 30. Which of the following statements is/are correct? X 1. Relative humidity compares the number of H20 molecules present in the atmosphere relative to the number of 02 molecules. '’2. The conversion of 02 to 03 by sunlight is an exothermic process. I"3. Acid rain is partly a result of the oxidation of sulfur compounds that lead to the formation of H2804 A) 2 and 3 only B) 1 and 2 only C) All statements are correct D) 1 and 3 only E) 3 only Chemistry 1050 December Test, 2008-09 Page 15 31. Assume that air contains, by volume, 78% N2, 21% 02, and 1% Ar. By what factor does the density of air increase when proceeding from high altitude (25 kPa and -50 °C) to low altitude (100 kPa and +25 °C)? 0.0 r1er = atmxo-nfikzmxo-W) ’ +139. 95x00!) o)1.3 .: 463; -' D)” a’ ‘ - 43-7: MS 0.39! k” - = E)2.7 41 tamxaa Jim—0 = J‘s-“5:00 = 1"", a, 8‘114K398 IOU) ‘ _ [~17 __ _ L) .0 32. The province of Ontario consumes approximately 3.5 million petajoules of energy each year. Electricity accounts for 400 petajoules (400 X 1015 J) of this energy. If all of the electrical energy is produced by nuclear reactors operating at 20% efficiency in the conversion of nuclear energy to electrical energy, how many kilograms of 235U are required? The fission of 235U produces 8.8 X 1013 J kg'1. A) 23x103 :69? J’s-u : 400K (0 T B) 0.91 x 103 ,3 -1 o) 4.5 x103 3'3A 10 7.? D)91x103 = 4545 E) 0.23x103 7610163 Jun 4070 5X M mufifl) 7* :7 4545ij5 =J-J7X3/0 kg #3510 ’3 Chemistry 1050 December Test, 2008-09 Page 16 33. Which of the following statements is/are correct? V 1. In general, silicones contain the Si-O-Si structural unit w 2. In general, silicones offer excellent resistance to weather and other environmental effects X 3. This is an example of a fusion reaction: 235U + n 9 137Cs + 95Rb + 4n '71-‘13. is fission / B) None of the statements are correct C) All statements are correct D) 1 and 3 only E) 3 only 34. 100 mL of 0.75 M HCI at 20 °C were combined with 100 mL of 1.0 M NaOH at 30 °C and allowed to react. Which of the following statement(s) is/are correct? 5‘ 1. Immediately after the reaction is complete, the temperature of the solution is 25 °C \L 2. Immediately after the reaction is complete, the concentration of NaCl is 0.75 M [Nag/J = 0- 375 M aha-b di/cdbn \/ 3. After the reaction, the solution will gradually return to room temperature B) 1 and 2 only C) All statements are correct D) 1 and 3 only E) None of the statements are correct Chemistry 1050 December Test, 2008-09 Page 17 35. Which piece of apparatus in the box is an Erlenmeyer flask? B)2 C)1 D)5 E)4 ...
View Full Document

Page1 / 17

DecExam2008 - Chemistry 1050 December Test, 2008-09 Page 1...

This preview shows document pages 1 - 17. Sign up to view the full document.

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