KeyE3morningSp09

KeyE3morningSp09 - C101 Spring 2009—Exam 3—Form A...

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Unformatted text preview: C101 Spring 2009—Exam 3—Form A (morning exam) M 6;! V 1. A b£oon filled with gas is subjected to the following conditions. Which combination would gum tee that the volume of the balloon would increase? going: #4“ £9 71‘ J n T J a. ,9 L increase pressure and decrease temperature b. 4 Q increase pressure and increase temperature Q decrease pressure and increase temperature d. I, & remove some gas from the balloon and increase the pressure e. ‘ J, remove some gas from the balloon and decrease the temperature 2. Which would not be described as a solution? a. a carbonated beverage b. a dental filling made ong and Ag @ vegetable soup v" 40* AMOJMLOKS d. moist air e. aqueous magnesium nitrate 3. A process that releases heat to the surroundings @ WR’L o m 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 endotherlrJic and the enthalpv change is negative. 4. One mole each of HF, BILL: and CH4 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 velocitv.-"'-9 ad], *9“? [if uié 5M¢ c. The pressure in the flask will increase if the temperature is reduced. Ala f ‘6'?- d. All of the gases are able to form strong intermolecular hvdrogen bonds. “1740!: m It!“ owl . e. all of the above 5. Which of the following is capable of dipole—dipole interactions, buflt H—bond? a. NH?) 2 ; fig,le [,9 AffFJ #flajfitfi b. (THEOH gm ’4 .5”! c. (Tl-1.41NH2 u d. (TS2 agape/“(flit 00;) fl fig: “9’ e/W HES h/ 6. Which would have a negative value for AS? In other words, which involves entropv decreasing? @ a marching band lining up for a parade V‘s} b. seeds scattered in the wind [at c. playing cards being shuffled/lo d. a and b e. aandc ’4 75 7’. A sample of gas in a balloon has a volume of 90.0 mL when the temperature is 225 K. What is the Tzztemperatu re if the volume is 60.0 mL? 7 V:- 0; 0’» Male 1). 90.0 K I” ‘7? if" I/ ‘5 T F 7 a] L c. 1:931: y ,i a 33:7,- ; fi—(zzfl) 1/ J. In Tako @ 130.1? ) v; F45 5...de e. 338 K '7; z {an 8. 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? K- a_ 3_12‘L Q Tbtq73fii '49 3 1' “so: @ 12.5 L -- V X Z ‘3' “a;f;fi “fl 3 g 740 ‘I Q3) 9:» {ZS-L Ll. 6.20 7.; L PL 7'; e. 1.99 L 9. Assuming all gases are at the same temperature and; fissure, ho\v manv liters of oxygen gas are formed when 4.0 L ofN205 gas decompose? Mé‘ 1'” ‘1'" AWJGIWIWJ “0"! 2 N205 —’ 2 N2 + 5 02 a. 2.5L02gas (/5, W i, l). 1.6LOO gas .. ‘ O c. 0.20 L 02 gas “ab? .1: la L 6L d. 5.0 L 02 gas 25 L”; .s’ (a 10. L 02 gas 10. What is the concentration if a 4 M salt solution is diluted hv a factor of 8? . _. 3 I a. 32 M flew b. 0.2 M A; 3‘ 41'5""! c. 0.3 M .L 69 (15 M g 5 0.5791 e. 1.0 M 11. How manv moles of gas are in gas—filled balloon that has a volume of 6720 L when the pressure is W 7’42 mmZPZIg and; the te1nperat11175°€? p V: I, J2 T a. ' .' mo ,_, V 7 aim/K o 3 l). 2.81 mol 0 "" E31” 3 L t: 2f" 1 £3 “ m" a .sz?g’9 cl. 31.9 mol W; L e. 1.71 x 103mo1 12. How manv grams of NaCl are present in 500. mL of a 0.30 M solution? a. 0.39 g MM 30 b. 2.6 g ‘9' 30’" W 0’ L5. is» c. 35 g d. 0.15;; a- 0 Saw“): . a war/K “7: 13. 14. 16. 18. 9 The number of molecules of gas in a rigid—\valled container is tripled and the Kelvin temperature is reduced to half the original value. Which pressure change is consistent with this information? a. The pressure will increase hv a factor of 3. M055 p k: ’5 g! l). The pressure will decrease hv a factor of 2. z W --°-9 f fix @ The pressure changes from 10.0 torr to 15.0 torr. d. The pressure changes from 5.00 atm to 10.0 atm. amt/5m! W ’3 e. The pressure changes from 30.0 torr to 10.0 torr. «11121 ,2 ‘M an" arch " A gas occupies a certain volume at 300 K and 600 torr. If the pressure is reduced to 500 torr, What will the temperature have to he to keep the volume constant? ,0 x 7 4’” £er :5 1/ 69 250 K 1). 360K 8 f; ,. fir .. goo-Inf 3. w -- 00L c. 1000K “7’7” '7'; 75' I 1 m(3 ) d. 500K e. 180K 7;: zgofi The main components of air are N2, 02, Ar, (:02 and water vapor. Which of these gases is moving the fastest in a sample of air at 20°C? may MM; W. a. N2 l). ()2 /n. I c. Ar d. co2 gag/fl. I water vapor /%/”0/ What is the concentration if a 50.0 L sample of river water contains 250 microliters of dioxin? a. 5.0 % l). 0.05 % c. 0.50 ppm 9 5.0 ppm e. 500 ppm What volume will 10.0 moles of oxygen gas occupv at STP? a. 14.3'L L b 5 L b. 0.?00L Qédfi%% 22‘! c. 2.24L d' 0446]; Zia/M (Id/m &{ 224 L Which of the following pairs is expected to he a soluble combination? @ hexane (C(‘l-Imj and CBr4 y l). CaCl2 in (“£14 c. water and (Tl-13CHECHECl-Ifi d. RhBr in hexane (C(‘l-Imj e. none of the above Use the folloth r chemical e nation for u stions 19 - 21. K 5 5 q {(4349: l 4NH3 + 5 02 S 4N0 + GHEO =9 5‘- ar.» .3:- 7‘ 19. W71 . t i.‘ t1 ilil i .‘t. t r f this . Li ? a "n s "1e equ )r um cons an express on or s reac on I‘M“ e14 («flirt J" a. r: |AO|+[H20| d- I.: |N0u1y20| WM—fi: an.— [021+lNH3] [Ozli‘mHfil I’wfl’ an - _ [NHaIHZoi . _ roll-Tim's“ 5’“ C “M” l). I — — e. l — fl . [02][N0] [NO] [H20] m it,” - INOWIHZOI“ 5 Q I . . . fan, (—7. /# 0/ . 20. At the temperature of this reaction, all of the reactants anc proc uct..‘ are gases. According to LeChatelier’s Principle, what will happen if the pr .‘sure on this reaction is increased? Q the reaction will shift toward reactants Agar} A“; “Mk; ‘ l). the reaction will shift toward products airfls ‘lcd IOZISIJ’VUHM4 ‘ c. the concentrations of NO and water will increase 5;?“ t“. d. the concentrations of NH?) and 02 will decrease w g? kg; 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 manipulate _, _ , I. f , the reaction so that more INC) would be produced? ’5 ‘ Jill-1’7; 1‘ 1) add ammonia 2) remove oxygen add water 4) removing NO {It} 219 no 7d a. only #1 1). only #2 c. only #3 d. #2 and #3 Q #1 and #4 22. Guaifenesin, a component of cough medicines, is prepared to be 3.0% (wij in water. What is the molarity of this solution? (Guaifenesin is 198.22 ngol.) L’ we“; 3‘9 Gui. #301! a. 0.03 M I b. 0.0 M ngjxj—"g'" v3.2? 6 0.15 M I J z» 0.;§-%’~£ d. 5.9 M 0. IL— e. 1.5 x 104 M mfg/n 23. Which of the following aqueous solutions would have the highest boiling oint? a. 0.40 M KBr zx 0.8m ,W‘Je; Mas-f «Jed m 49 0.40 M (1526,0321 1.2M 9 . eff c. 0.30 MBao2 3,: (9331 an) “Ml/d, 7h 0 d. 0.25 M [($04 gut I. 0/}? jug; m e. 1.0 M fructose (a covalent compound)” it “IV: 24. 26. 28. (9 N40 M2, AMP What volume of ammonia (at P) is produced if 28 U nitrogen gas react with excess l-I2 gas? N2 4) + 3H2 (g) 3 '11., (g) a. 2.00 L zgjs/fid .9130} b. 22.4 L c. 34.1 L (211:, == zwl/fiéfg @ 44.8 L 253 law" "’3' g e. 89.6]; D (lac/1%: 9"}.3L What types of intermolecular forces exist between molecules of compound A and molecules of compound B? a. U‘liondon dispersion forces b. Wipole—dipole forces c. hydrogen bonding ‘ @ a and b \—> 130'} Ike/«[21 5/366 {g cm 4 ll'élfil- e. all of the above A reaction is found to absorb heat and has a positive change in entropy. Which statement correctlv 3 pros Mp0: :‘mbcmleé “’0 a. The reaction is spontaneous at all temperatures. 6""; fgék-k‘g $5 3 The reaction is spontaneous if the temperature becomes high enough. 4.9 41514 4’15? {375$ :3 Age) Cownévméb” Steam (36 grams at 120.0%?) is cooled until the entire sample condenses to liquid at 100.0°C HAW much heat is released? describes the reaction? b. The reaction is nonspontaneous at all temperatures. d. The reaction is EXOtl'IEI‘IIllC. e. The reaction involves a decrease in disorder. Note: The specific heat for P120 vapor is 0.480 cangoC and the heat of vaporization is 540. cang. a. 0.346 kcal @ 19.814123] 3“ “0° $13“ loom 61/00" c. 19.114111 WP“ L39)ng d. 1.43 kcal J . e. Fest“??? 292) 6— —--= Which of the following forms ions in solution when dissolved in water? Lfl amine! a. (“413G120 all cwdwl' igfihnt b. c.4120” c. (“H.NO2 d. N20 z I, 0 WM} 29. The following reaction is at equilibrium. Analvsis reveals that I 10 atm, [C12] I 9 atm, and [P05] I 12 atm. What is the value of the equilibrium constant, K, under these conditions? mug) + (112%) : PCl5(g) 1.3x10‘l g) 1.1x103 K” 3% c. T5 d. 423 a, #61:] __ (12.2 a e. 9.3x10‘2 K WHO“? 0.633 30. Determine the free energv change for the following reaction at 298K. (1314 + H2 (g) —> l-ICl (g) + Cl—ICls Note: AH I —21.83 kcal and AS I 9.92 calXK for this reaction. a@. —18.9 lgcal A C- a: A}! «#725 —24.8 kcal c. _2.93 lgcal 13‘" #23330 6-1 wiltflzagi“? d. 24.8kcal 3; "Zigsocd M 275-6." .1: “29.736." (4 e 31 .7’ kcal .. z, , .3 Use the following reaction for question 31. 2802(g) + 02(gj 4.- 2803(g) 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 @0’0“, 2: K J Zuni-1'03 6 49.6 k]; release“?! \ I d. 49.6 k]; absorbedj Space I, 5 g M C 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 : m m b. \‘TT:l§ V MT ‘50 c. 1Xl< I VT @9 v : kT 6- VtTt : V2T2 A solution contains a non—volatile solute. Which will lower the vapor pressure of the solution? a. raise its temperature a") (341‘; Wax/(ch GD add more of the non—volatile solute ;? f‘wm Vyaffrzfim c. dilute the solution with more solvent d. all of the above 1 [QM {Mild e. none of the above I; “ff/«gm: lhc’zws. Use the following energy diagram for problems 34 through 36. 34. 36. reactants mu: “a! 6 Free Energy ‘3 [kiiojoulesfl ‘ 4 u t, I l 3 )3 a. M A!” Mali. 3 . l 2 (II/owe“ 1 What is AG for this reaction? a. --'2 lg] l). --6 lg] —1.5 lg] @ —4.5 lg] e. —6.5 lg] What is the activation energv for this reaction? __2.01g] My)“; 6.3. :3 #1. Lil} fin #m'f’ {we}? @ --6.0 lg] c. --6.5 lg] d. "8.0 lg] e. none of the above Which would be a reasonable value for the activation energv if a catalyst was present? @9 ——1.51g] b. ——2.5 1g] c. 1g] d. ——5.5 1g] e. ——6.5 1g] If 500 mL of 0.20 M sodium sulfate solution and 500 mL of water are combined, What is the approximate sodium ion concentration in the resulting solution? Hint: What is the formula for s odiu m sulfate? >3 Luz» A, a, .4016»? $00301. $50.93!, a. 0.10 M Q 020 M {to/wk}! {61M ’41 z . c. 0.40 M d. 0.80 M 0.2.01” lav-(09 "'9 0J0.” My“)? e. 1.0 M #5} an, ,3 >409 Isa/wt}?! x? 2.47m: M3,”? cm. 38. 39. 40. Which statement is true? a. Heat is abwfefillifigiévater freezes. /¢§$M 1). AS is vae inggoin‘gcfrom liquid water to ice. Heat is released \sien steam condenses to form liquid water.%j '35ko ML d. AH is gdih’g from ice to liquid water. e. none of the above The observed trend in the boiling points for the following compounds is partly due to increasing formula weight. methane CPL bp I —161.5°C ethane CHsCHgCHg bp I —44.5°C butane (Tl-13CHECHECHfi bp I 415°C Another factor in understanding the boiling point trend for these compounds is the increase in a. Dipole—dipole interactions ® London dispersion intermolecular forces I'M/3‘“!!! m W *4 I c. Hydrogen bonding intermolecular forces (9 Mi tlgg'k"; M‘ d. a and b M,” {afficg Med... e. b and c W’hich gas has London dispersion as its only intermolecular force? Q F2 FL “mid/W :cfia‘ in”? 1). co c. PH. a}; Mt P/M, H d. up .2,” e. SO? ...
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This note was uploaded on 12/01/2010 for the course PHYSICS 21900 taught by Professor Rhoads during the Spring '10 term at IUPUI.

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KeyE3morningSp09 - C101 Spring 2009—Exam 3—Form A...

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