# KeyE3eveningSp09 - C101 Spring 2009—Exam 3—Form(evening...

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Unformatted text preview: C101 Spring 2009—Exam 3—Form] (evening exam) £- 1. A l lloorf‘cﬁlﬁil 31%] gas is subjected to the following conditions. Which combination would gu’ antee that the volume of the balloon would decrease? 00' {.- \L I“; P¢ ’71- 3 ”‘1’ a. 1“. decrease pressure and decrease temperature b. J, 1‘ increase pressure and increase temperature c. f 1‘ decrease pressure and increase temperature d. ,L 1‘ remove some gas from the balloon and increase the temperature @J’ {I remove some gas from the balloon and decrease the temperature 2. Which would not be described as a solution? a. a mixture of argon and krvpton gases @ spaghetti sauce 30* kﬁym¢ﬁuf c. KBr (aqj d. a carbonated beverage e. brass, an allov of copper and zinc 3. A process that releases heat to the surroundings A uoh’y'é 3 AH“ 0 a. can onlv be spontaneous if TAS < 0. b. can onlv be spontaneous if AS is positive. c. is said to be exothermic and the enthalpv change is positive. ® is said to be exothermic and the enthalpv change is negative. e. is said to be endotherltnic and the enthalpv change is negative. 4. One mole each of HF, BILL: and CPL are in a flask. The total pressure is 3 x 10—3 atm. Which statement is true? @ Each gas has the same partial pressure. b. Each gas has the same average velocitvr-‘w? 05” 7916.. 11;";de W45 6-” IMC— c. The pressure in the flask will increase if the temperature is reducedﬂo .037 d. All of the gases are able to form strong intermolecular hvdrogen bonds. all, ”FM ”40" e. all of the above 5. Which of the following is capable of dipole—dipole interactions, but can’t H—bond? 'l-I 3' IN cl (ape/or (baa ”EM/5’0 but; b. (Tl-IEOI-I P “Y c. (:H_.,NH2 CM, ””501 " _ u l d' CS? ﬁanpé/W "1 ’5‘ ”a W75 ,o/”' 69 HES ﬂ 6. Which would have a positive value for AS? In other words, which involves entropv increasing? a. a marching band lining up for a parade b. seeds scattered in the wind t/ M56 w c. plaving cards being shuffled g/ Wm H” d. a and b bandc 10. 11. 12. . . ‘11; _ Z”: , . . . . A gas occupies 36 m at 291 K. Assuming constant pressure, What is the temperature if the gas expands to ﬁll a 65 mL container? R5? 6 536 K "I. b. 1.86 x 10-3 K 3;, 5, :3, c. 164 K '7? 7'1» d. 0.122 K J smut. .. = J'- == -————--(297 - 5': e. 326 K V, ? R w 7’ sent ’9 ‘K 2.. What is the volume at 380 torr and 200°C, if the volume of P12 gas is 4.00 L at 7’60 torr and 30°C? a 3.12L Q 73"?7314 1,9 I} 7, \$393K. Q 12.5L c. 8061 &;w ”,2 g 8147': 5 L749! 4} #73) g ”51, d. 6.20 L 7} 73, p; 7; (394;)(303') e. 1.99 L Assuming all gases are at the same temperature and pressure, ho\v manv liters of oKvgen gas are _ gas decompose? WM“? 7 W34..." V“: ’1 formed when 4.0 L ofo), 2 N20, —’ 2 N2 + 5 02 a. 2.5LO2 gas VL M :9 l). 1.6LO2 gas c. 0.20L 02 gas (“LA/”9% 3’; 0; .—~.. ,oz, 92., d. 5.0 L 02 gas 31.1929! (3) 10. L02 gas What is the concentration if a 0.80 M salt solution is diluted hv a factor of 4? a. 3.2 M C9 0-20 M (awﬁX—é): £9.23? c. 1.2 M a. 0.5 M e. 5.0 M How manv moles of molecular nitrogen are conﬁned in a 4.5 L vessel, if the temperature is 27’ K and the ressure is 3.0 atm? p pygplﬁ'r @ 6.09 mol 1). 0.164 11161 ,aV :0 9.51:. F . =3 M5 ’ ”'7' 6 09590, c. 0.342 mol ’0 ’97" 6.02HL¢"\ 27g " d. 1.84 mol ( ”I Kr X ) e. 4.44 x 103 mol If 4.00 g of KCl are dissolved in water to give 500. mL of solution, What is the molaritv of the potassium chloride solution? 220 M KC! 74% (9 w, “El. 1). 8.00M N] Lia! an c. s x 10-3 M I . —-'l- g! EL.” :9 M W22... Wm afoot 13. 14. 16. 18. The number of molecules of gas in a rigid— \valled container is tripled and the Kelvin temperature is reduced to half the original value. XV hich pressure change is consistent with this informa on? a. The pressure will increase bv a factor of 3. 1304.5 é'p/Il“; p ‘47 5 g! b. The pressure will decrease bv a factor of 2. K M A]; nun-m9 P M! Jnx c. The pressure changes from 5.00 atm to 10.0 atm. g. d. The pressure changes from 30.0 torr to 10.0 torr. c5051”!!! WI; / x Q The pressure changes from 10.0 torr to 15.0 torr. 5 1‘ Fl.‘ IS Kl}! 0F ’4" at" . . F F U. 6 If a1r occup1es 515 mL at a pressure o 7’35 mmHg What is the volume of the air at 432% mml-Ig? (Assume no change in temperature.) V1? P1. a. 303mng .-.-. P (/2, b. 616 mL ; p, u, Méggﬂﬁlbxsyrm)m 0 876 mL wilmﬁ d. 1.62 x10‘3mL e. 3.30 x10'3mL The main components of air are N2, 02, Ar, (:02 and water vapor. XVhich of these gases is moving the slo“ est in a sample of air at 5TTJ 11"?" IMH- MW” .ﬂ¢ ”6‘06";- 21. N2 Iii/m; b. 02 32” c. Ar #0 69 CO2 ‘M e. water vapor [3 XVhat is the concentration if a 50.0 L sample of river water contains 25.0 microliters ofbutanol? 0.50 ppm 9 5.0 ppm (2 50‘7‘1 /;“;‘) x /0‘ ”(QS'W c. 500 ppm 5.0 0L- d. 0.05 % e. 5.0 % l-IovT man}T moles are present in a sample of gas that occupies 0270 L at STP? a. 12 mol [MOI a. zzﬂL @ ITP b. 83 mol c. 8.5 x 10'2 mol 0 270‘.» a: 0.0IZO§- na/ _ 71' 2’2.qu d. 6.02 x 10“" mol “-2- 9 I4 ’00 m/ Q 1.2 x 10‘“ mol XV hich of the following pairs is expected to be a soluble combination? a. hexane (C(‘l-Imj and CaBr2 “like “(my [52¢ b. CaCl2 in (“£14 c. water and (Tl-13CHECHECl-Iﬁ @ RbBr and water 7;; Annie.) V“, fol” e. none of the above 1956:” 142,0 mektffmi; an #- “’4‘“- wcfp/M’ Use the following chemical equation for questions 19 - 21. [Ema 4M1. + so2 : 4N0 + ()Hgo K115,“ J I V H 'I 19. What is the equilibrium constant expression for this reaction? ,1 I- : [NO] + [H201 @ I- : [N014 [H2016 a?“ mi mahv‘ [0.1+ we] Log-”was“ ,y 45> a" w“ ﬁacd all h I? : [NHQHHZO] e I? : [NONI—120] fl ’ ‘ [0mm] mama] #1 “W: ‘3‘" I s 4 I.” M r : m ”QM [N0]4 [H.101" ,7 ﬂute! 9-6 was] 20. At the temperature of this reaction, all of the reactants and product. are gases. According to LeChatelier’s Princi le, what will ha en if the ressure on this reaction is i cre. sed? . p . . pp p p?‘ was; A“) ”Mk3 Q the reaction will shift toward reactants ,L ‘ l J l). the reaction will shift toward products 0 JIJ [“566 3 2&1 G c. the concentrations of NO and water will increase SIM ”OW, d. the concentrations of NH?) and 02 will decrease M 'P A“ “WC! ' e. changing the pressure does not cause a stress to this reaction 21. Suppose you wanted to commercially make NO gas using this reaction. How could you manifulate the reaction so that more NO would he produced? )3 g, M ﬁat“! M'écrgi ) 1) add ammonia '2) add water 3) add oxygen 4) remove ammonia gas ”9 ya; ’30 a. only #1 1). only #2 c. only #3 ED #1 and #3 e. #2 and #4 22. What is the approximate molarity of a hydrochloric acid (HO) solution prepared to he a 32% w y in water? ' ( X j 9 M 3L7. ”7’6 mm; M} . Isa/w ’3 é) . mo man/ m Ava/es fﬂ’u‘k l). 0.3 M _ LId’M‘hw c. 9 x10” M (32 mix-ML) d. 3 M J 36. V61; 3 \$777531 e. 15 M 0. /09 L- b 23. Which of the following aqueous solutions would have the lowest freezing point? a. 0.60 M KI u. 1.23! pwﬁ‘olu anaksq’ 5.5.3355 F! b. 0.30 M Kgco. 3K 9.9m ‘ , U lesf' ”’5" Q 0.40 M two. 91 /.6»1----9 J w,” . «1‘ com. 97 W a“? d. 0.40 MBaC12 3,: AM} a”! m a! ,1) e. 1.5 M glucose (a covalent compoundjlg 1.5-!" 24. What volume of ammonia (at P) is produced if 28 (T itrogen gas react with excess 1-12 gas? W - N2 (T) + 31-12 (g) ' 1-1.] (g) a. 2.00 L 2.8.59; who] Rm! b. 22 4 L @ :léL ngﬂzWXm‘... o/A’M Pam/ﬁll; .L Ariel ”L e. 89.6]; (D (Ema/1%: 4?. 49¢ 25. What tvpes of intermolecular forces exist between molecules of compound A and molecules of compound B? A B I I I H—C]?—C—Br W H—C—O—H a. “London dispersion forces 5 40 A . b. b/dipole—dipole forces . 1r-1 g 1 a g ‘ ‘ 3.33:“ “\a we Man/.1 mu: 4;; MT #réml. e. all of the above 26. A reaction is found to absorb heat and has a positive chantTe 1n entropv. W hich statement correctlv describes the reaction? 51-1995 MPO; MP5 {nbzo‘b} ”a a. The reaction is spontaneous at all temperatures. “’95 idbﬂv'kS ’2‘; b. The reaction is nonspontaneous at all temperatures. a The reaction is spontaneous if the temperature becomes hiCTh enouCTh. d. The reaction is exotherltnic. A 6'5 AH ”TAS e. The reaction involves a decrease in disorder. 5 ’7' 7A5 I} / WA” 3 J 27’. Steam (36 grams at 120.0%?) is cooled until the entire sample condenses to liquid at 100.0°C ﬂiov much heat is released? Note: The specific heat for P120 vapor is 0.480 calXCToC and the heat of vaporization is 540. cang. a. 0.346kcal ‘5, 120°: xw’m-j/ 100' T .3? ’1’ 6;) 19.8ka WM» L3 35199.29 c. 19.1 kcal #33:? fTGSX"*‘;;~‘?z—i" new .. O 28. Which of the following forms ions in solution when dissolved in water? gm «Mfg 725‘ 6 :4 a. (“H.Cl but 1) so ) ”aw 'l ’ 9 g @ I<c1 m /m:2, [(-le ——-T> 121"}.‘9 4* at?) L 7 u: 2,0 l ND - vcwehinl' e. (THJNOE 29. The following reaction is at equilibrium. Analvsis reveals that [P0,] : 10 atm, [C12] : 9 atm, and [P05] : 12 atm. What is the value of the equilibrium constant, K, under these conditions? Pc1,(g) + c1415) 2 Peggy 1.3 x 10-‘ Q 1.1 x 10” K "‘ ﬁg} 5.; K, [ma ,_ 02......) e. 9.3 x 10-2 [#6153333 ._ (Id? 30. Determine the free energv change for the following reaction at 298K. CCL, (I) + H2 (g) —> l-ICl (g) + Cl—ICls (1‘) Note: AH : —21.83 kcal and AS : 9.92 calXK for this reaction. @ _1s.9 lgcal A C- a“: All .... TA! —24.8 kcal c. 4.9311131 A 5' 5 "23330“! ”law’ﬁzayf‘kq'gﬂ a. 24.8 kcal .~: _Z,359 a! .... yard. wzq7861£ “If e 31 .7’ kcal I .. 2,4,9 I? Use the following reaction for question 31. e 04333 H 2802ng + 02(gj 4.- 280.,ng Al—II—1982k] 31. Formation of 40.0 g of SO, gas will result in being a. 99.1 k]; released b. 99.1 k]; absorbed @0,%S¢‘K_wliwg ﬂ qq.‘ K Q 49.6 k]; released f0 2’19, a J \ mm d. 49.6 k]; absorbed 2 Wﬂlé 5}th M ag- e. 396 k]; released 32. Since volume and temperature are directlv proportional to each other (for a ﬁxed amount of gas at constant pres sure) we mathematicallv sav that: a. v : to m 69 V=kT Vag'l" g3 Ive-k7. c. 1X11 : VT d. VT : lg e. VIT] : Vng 33. A solution contains a non—volatile solute. Which will raise the vapor pressure of the solution? a. lower its temperature“) Amy; VW/O’YHWﬁ b. add more of the non—volatile solute :9) [gm WW fﬂﬂwﬁ- @ dilute the solution with more solvent d. all ofthe above L512: 4 4;” lea e. none of the above ﬂ Vyyﬂa‘wc I}! ”61:63 Use the following energy diagram for problems 34 through 36. “x! mm Free Energy [kiiojoulesﬂ mats AG— » . 34. What is AG for this reaction? w ”3"“ 9% \$‘AMM; l o ” a. "214 'ﬁmbﬂ'm l). --6 k] —1.5 k] @ —4.5 k] e. —6.5 k] 35. What is the activation energy (Ea) for this reaction? a. --1.5 k] G) ——2.0 k] c. --6.0 k] d. --6.5 k] e. "8.0 k] 36. What is the activation energy for the reverse reaction? a. --1.5 k] l). --'2.0 k] c. --4.5 k] @ --6.5 k] e. "8.0 k] 37’. 200 mL of 2.0 M calcium chloride solution are combined with 800 mL of water. What is the approximate chloride ion concentration of the resulting solution? @ 0-80 M zoo ”L m—a/aaamL AVMLM I, M at ﬁve.- l). 0.50 M c. 0.40 M d. 0.20 M git-(2‘01" Cal-‘42,) =‘w 0.9/17 04116" e. 2.0 M Cl" m-ﬁa’rh in M 9MB» (3 2x WC'LGQM. @ 38. 39. 40. paella 13,10”) 50/94 {3314:0451 Which statement is t will “5:0 1'“ (’0’: \$312 ll "4%., cf V a. Heat is ab r )ec when water freezes. h. AS is poﬁl’v! n g\$g from liquid water to ice. @ Heat is released \‘s-hen steam condenses to form liquid \s-*ater.'ﬂ"1'a|I ’55" {m ‘8’!!! .l d. AH is negﬂfigg‘ingoiﬁg from ice to liquid water. e. none of the above The ohserved trend in the hoiling points for the following compounds is partly due to increasing formula weight. methane CPL hp : —161.5°C ethane CHsCHgCHg hp : —44.5°C hutane (Tl-13CHECHECHﬁ hp : 415°C Another factor in understanding the hoiling point trend for these compounds is the increase in a. Dipole—dipole interactions ® London dispersion intermolecular forces by ﬁlletﬁ/{J m MW .5} ("D c. Hydrogen honding intermolecular forces (—9 m dim; d. a and b an! m :Mﬁcem. e. b and 0 Which gas has London dispersion as its only intermolecular force? a. Hc1 “ 29"“ d2; .. 1). PH. “H: “ ﬁ’ 6) BCls-‘ﬂ Maﬁa!“ 8 I; - H / \h g .- Ll. l‘Ig(_) :clg' : a: I, .... 0'. e. 509 ' ‘ I M; It '§,*.S“",0 '7‘” ...
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