Exam3KEY - (”O/s" EM 3#08 KEY to forms A(morning and...

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Unformatted text preview: (”O/s" EM 3- #08 KEY to forms A (morning) and J (evening). Other forms are scrambled versions of this form. 1. U1 6. A fixed amount of gas occupies a flask with a volume of 2.55 L. Vv‘l--'71"1at is the effect on the pressure of the gas if the temperature is increased? 7'- ¢ P p G b. c. d. E. The pressure increases. The pressure decreases. The pressure remains the same. The pressure might increase or decrease depending on the number ofmoles present. There is not enough information to determine the effect on the pressure. If 400 mL of water are added to 0.40 mole of potassium nitrate, what would be the approximate concentration of the resulting solution? 6? b. c. d. C. gem... .. ,.......1 0.75 M 0.400 a. "if” 050 M 0.10 M 0.050 M Which of the following is 40. ppm? El. 4.0 ml. in 1.0 x 102 ml. of solution C 4.0 mL in 1.0 x 10"L mL of solution ”gm- K /0 =5 gaff“ 4.0 mL in 1.0 ><10fi m'L ofsolution AD flies“; 4.0 mL in 1.0 x 10“ mL of solution 4.0 mL in 1.0 x 10") mL of solution Vu‘l--'71"1at mass of barium chloride is needed to prepare 500 mL of 0.28 M BaCl2 solution? 7.3 g 48.4 g (a_ gdaL 0.28M’6fl 2-08.1ng 3 ¢ 2—2 ’5- 292 g 2' mo! 5 116.6 g 372 g The gases in this problem are all at the same temperature. Which of the following shows the gases listed correctly in order of increasing average velocity? ’El. 69 c. d. E. {Au/[e114 mac; Ania-1‘ Ne < l-I2 < Ar < Cl2 (:12 < Ar < Ne < H2 #3, 9A»! Ar < Ne < (:1. < H. A/e: 4235/»! (“.12 < Ne < P12 <Ar ’4’, WAD! Cl. < Ne < Ar < H2 at 'dmui The ability of water to form intermolecular hydrogen bonds is responsib e for ’51. b. E d. 6. its surprisingly low specific heat. its low heat of vaporization. its surprisingly high boiling point./ the increase in density when liquid water freezes. all of the above 10. 11. Calculate the pressure When 3.0 moles of an ideal gas occupy a volume of 3.0 L and the tem erature is 400 K? Q 33 atm ). )7’ a m .082 1 ( t ,0: ”V197: Gnu-5Q JWTXWK) c. 296 atm d. 3.1 x 10'2 atm 3,51,. e. 3.1x102 atm p; 33 _8a{a¥”&- V~‘\'--'l"1at types of intermolecular forces exist between molecules of compound A and molecules of compound B? A B '1 '1 '1 H—c—e—Br H—(Is—o—H H H H a. London dispersion f()rces"/ . - _. - . I/ .- b. dipole dipole forces :Ml/a ‘ ’4 I: 40“ “[¢_ 4 [I I'll) c. hydrogen bonding . é) aandb e. all of the above Suppose 15.0 g of methanol (CI-IfiCJT-I) and 85.0 g of water are combined. What is the concentration of the solution that is produced? a. 1.76 % W/W .. _, ( J ,9 4,36 - /09 Ja’wflm b. 0.1 :6 % (“T/W) c. 1?.6 % (“T/w) Mime : zg%‘%u d. 0.1 5 9/0 (W/ W) M?) I9 ’w'fim 15-0 % (“T/W) An endothermic reaction is one where heat is and AH is zero. 357d JIM m a. absorbed, less than 1). released, less than Q absorbed, greater than A” >0 d. released, greater than e. Don’t mark E! What is the approximate molarit}? of a solution of NaOl—I that is 5.0% w/V?/ (1680“! «In a. 16 l\-'l I S. ”0"; M9 5 W > M 1). 0.80 M L- xme c. 12.5 M Rem/ml d. 0.039 M 49 Aim - _. . Lamar mwm’ 1.23 M 4/45" 4‘3} .1.le ml uni—“W 12. 14. 16. A sample collected from a lake is found to contain 3.6 ppm mercurv. W'That is the concentration if 150 mL of the sample is diluted to a total volume of 600 mL? a. 50 ppm 14de ’SOML “"3? ‘QOM'L b. 1.8 x 102 ppm c. 14 ppm G'Cffdé‘gg- :5 0,70Ppm d. 0.25 ppm Q 0.90 ppm Steam (36 grams at 120.0°Cj is cooled until the entire sample condenses to liquid at 100.0°C. How much heat is released? The specific heat for HBO in the vapor phase is 0.480 cal/g°C. Note: Some additional useful information is available on the front of the exam. 0.34611cal ’w'fiv-m-é 10922 you'd 1.43 kcal ‘5“ ® “”5 ”PIA, 19.1 l<.cal _, clay. 0'! flip-ft. 198 lgcal frifim @ e. 734kcal f‘G" ”gig?! 0’9”!¥£6¢4 Which of the following is capable of dipole-dipole interactions, but c; n’t T-I-hond? a. 1311.420 1483 £73le 61¢- ”re/alarm“! Lb CI—IAOI-I .........— m 14-40% HES d. 5111.130 143:; M 1:, e. NT- Assume n and P are fixed for a sample of gas that occupies 200. mL at 350. K. \‘Uhat is the tem erature if the volume is 300. mL? 0» .2. P 300 1’ ‘2. , 9/1? 1.; .. 2.00M.” (/2, 300515. a. . . i "" "'"‘"""' 7' 7'" e .1: 7 1). 233 K ’ 3' 77 590*: 73' . c. 350. K #1141”- Cd.) 525K 7— ;: ”2,7? .. 3905!, y 2.1,. 3m: $251: e. 200. K {4 ZOOJ‘L \Which would have a neUative value for AS? a. (:02 (s) —> CO2 (13) i a 1). Ag‘ (an + I’ (aqj —> AgI (s) ”5‘"? bafwfly - - ( g; are. Jar) c. [email protected]+3112®—>21\H.(g) 1‘ 5’5...»- '2'”..- d. a and b bands A balloon occupies 2 L at 1 atm at 200 K. \‘lf'hat is the volume at 6 atm and 1200 K? a. 0050 L V’ ’0’ 7; We“? ‘0‘ 7L 1). 1 L c. 721 EL; £23119” V21"; M}... 5 01390390) d. 18 L 7; 11, y;- ,9; (wet é.) 2L 1/}: at, 18. 19. 20. 21. 22. nonfatal l\-'lolecules of pentane, CHfiCHZCHZCHZCHfi, interact with each other via Which type(sj of intermolecular forces? @ London dispersion forces ). Dipole—dipole forces c. Hydrogen bonding forces d. London dispersion forces and dipole—dipole forces e. London dispersion forces, dipole—dipole forces, and hydrogen bonding forces Consider the reversible reaction 2A 3 313. What is the value of the eguilibrium constant if the equilibrium concentration of A is 0.124 M and the equilibrium concentratiof of B is 0.327 M? C9 227 3 K b. 0.440 /<# (pa/J fiffi] .. (0.324723 c. 2.64 '" .. 3,. d 213 Cram?) [:4] L (9.125!) e. 4.05 x 10-2 K: 7, 4,7 If 400.0 mL (-ctose (CfiHmOr‘) solution were evaporated to dryness> how many grams of the fructose w ud we have? a. 2.5 g [0 Jam 1:. 4.0 g mm c. 25.0 g 69 40-0 4 ngfiét x01 4.1.44) .1:— tag, 5- 72-0 g ' Ian-I647,"- Compared to pure water, a 1.0 M solution of CsCl will have a a. higher boiling point and a higher freezing point. @ pigherlboliling point anld alloxlver 1freezing point. bf ,9", 6h“ " U‘IJ’L c. ower )01 mg point anc a "11g 1er reezmg point. ML 1‘ 97"! g d. lower boiling point and a lower freezing point. #P . ‘18, If e. none of the above I” ”J3 The enthalpy change is —43.2 lgcal for the reaction: 2 NO —> N2 + ()2 J» 91de Formation of 84 g of nitrogen gas will result in kcal being Hint: nitrogen gas, N3, is 28 g/mol. a. 43.2 lgcal; released @ 130 kcal ; released 94 ”L 40"!” W); I 96¢: c. 14.4 lgcal ; released L J 29195, Inn! ”9 Z d d. 43.2 l<.cal ; absorbed e. 130 kcal ; absorbed [36} M re/emal 49$“, mfiwmb Consider the following diagram when answering questions 23—26. Each “tick mark” on the y—axis represents an energy difference ofl kca]. Free Energy :: Reaction progress 23. Which line segment (3) represents the free energy change, AG, for this reaction? G? A l). B c. C d. D e. L 24. VWhich line segment (I) could represent En for this reaction if a catalyst was present? El. 1% l). B c. C Q D e. L 25 VNv‘hich line segment (1) represents the activation energy for the reverse reaction? fl A l) B c C d. D 26. Based on the energy diagram shown, which of the following could he the values for AG and Ea? a. AG : --6 kcal and Ea : +5 kcal @ AG : 4) kcal and L = +5 kcal 56—40 pm "lawn 14?! c. AG : --5 kcal and En : —6 kcal d. AG : --11 lgcal and En : +6 kcal 6. AG : —6 [seal and E.fl : +11 kcal 2?. 28. +2.73 3'» flak Vii-That is the value of AG fl r the reaction of 2 moles of bismuth and 3 moles of sulfur according to the equation: 2 Bi (s) + 3 S (s) —> Bi233 (s)? Caution: Watch your units! For this reaction, AH : —43.7 lgcal and AS : —15.2 call K. fl "" 0-6152—WK @ _392 lgcal be 3M “7235 39.2 kcal Ag, 1':- ~9£7£ca£*£!?3 4’0 OISMC‘g/K) c. 43.3 lgcal d. _433 lgcal 46- =3» *q‘i 7‘34 4. agar: M e. —48.2 lgcal be: Wankel Three liters of nitrogen and 6 L of oxygen reacted and produced 3 L of product (all gases at the same temperature and pressure). \‘l-ihich equation best describes What must have occurred? Hint: This is an application off‘wogadro’s Law. 3"”!- .5. cm; =, 3L ‘ E 3- N2 __ O: _3' N20: b. N2 -- 2 02 —> '2 N02 @ © @ c. 2N+O—>2N_O / :2, :I @ CD1? {932-6) 'Ho IN+Z30_—-2NO Use the following reaction for problems 29—31. 29. 30. 31. Heat + moon; ‘3 21mg; + C1263) 1 Ks ”'- r The equilibrium expression for the above reaction is: 1 [Noel]1 _1 2[NOC1] L [NOlTClzl L' 2[NO] [C12] b- [NOT [NOCI] 3 C [NO]3[C12] ' [NOCI] VJ‘l-ihich of the following would result from decreasincr the temperature in the reaction vessel? a. The equilibrium shifts to the right. L} M {99+ @ The equilibrium shifts to the left. c. blore NO will form. d. l\-lore chlorine Will form. e. none ofthe above Increasing the concentration of NO has Which of the following consequences? a. NOCl will decompose to form chlorine an 'l nitric oxide. b. The equilibrium shifts to the right. c. More Cl2 will form. @ l-Ieat Will be released. 'W 55%; e. all of the above [.‘H 32. 34. 36. Suppose a 4.00 L flask contains 21.45 g of a gas at 400.0 K and a pressure of 2.00 atm, what is the molecular weight of the gas? Hint: Substitute mass / molar mass for n in the ideal gas equation. a. b. C. 69 E. 22.4 g/mol fiver/1187' 42.9 g/mol Pr]: Mm .367" 86.0 g/mol M“) 88.1 g/mol ”W 3-, Mfi(zt.9§)Xa.MZ%WL' 1900K) ==‘ 334/ 7’ 3 0 mo l/ l 1 ( h/ 1 ’9 (W) ( v.0 L) m If 2.0 L of 0.40 IVI LiCl and 2.0 L of 0.60 l\-'l LiNO.) are combined, what is the lithium ion 3. b. 63 d. E. 21. b. c. d. £9 concentration in the resulting solution? ‘ 1 k L Xv with}?! if“! «dudes,» Wm a”! My 0 .2 \l 0.4\-1 9/; inoongngléfla arm! kart/wk 0.5 \1 - 2.0mm; ‘9‘ 0.; Mil /.m{ M :5- 0.gfi1 0.6 \1 (.2 X. "‘Z'") 5 4.01. 1.0 M Which of these aqueous solutipfs 91.151 have‘ the lowest. freezin r oint? ’ m I n. '"——-£L——'¢ ‘u; 4‘» 01¢.me "KI- 2.5 MNaCl 2‘“ * 3'. & ‘1" 5.0 M sucrose (table sugar) $1! m cow‘tfif' 1.5 M BaCl2 I-S'M I 1 :- 45’»! 1.5 \1 9110., 2.5:»: “I -‘~ CM! 1.0 M 1111430.). an at r a: 5% mid—Mills! ,omvvf' In which of the following reactions would increasing the pressure cause a shift in the equilibrium so that more products are produced? Note: All reactants and products are gases. 69 b. c. d. E. ----'2 . . 260 + 3N0 SENE + 2(102 A‘ a.” {51‘}de ?-‘>m mfg-M 4NH. + so2 t. 4N() + 61120 “H -—-r 2N9}: 2E2 + 5021...,H t «7 m,” 2,”) ZNBr.’ '3 N2 1 3135““ none of the above Decreasing the total pressure above a liquid (for example: by taking the liquid to a higher elevation) will cause the boiling point of the liquid to ‘El. (19 C. d. increase. 10”": 5P ’3' A‘fiikal» u flatten-1‘1” ”Mae decrease. #3, “WWW“ 8‘ simlfiolki Mm remain the same. depends on the density of the liquid (could increase, decrease or stay the same] depends on the molar mass of the liquid (could increase, decrease or stay the same) 38. 39. 40. 51 solution containincr 50 (r of sucrar in 500 (r of water would: ' . i z“ z“ r’ “ anywak :4!in came a. have a hicrher vapor pressure than pure water F) a, ”to? 114.155!!!“ @ have a vapor pressure less than pure water {#me c. boil at a temperature below 100°C '09 :retudfm «36 ,Wflmmt d. freeze at a temperature above 0°Cfl’0 e. none ofthe above J. p. A svrincre contains a was that has a volume of 20. 0 cc at 11. 5 psi. If the tip is blocked so that the gas can’t escape what pressure is required to decrease the volume to 1. 50 cc? 3r 7 If a. 0.863 psi p; L l). 345 psi .. Q 153 psi All, 8"," d. 230 psi P _ g u, p epg’fgxwea): 15335! . r , ... W e. 2.61 psi 1 V2" L55" How would vou correctl}T prepare 500.0 mL of a solution that i. 123( ) 4P a. dissolve 2.0 g NaZSOJ, in water and dilute to a total volume of 500.0 mi... “1.3—- b. dissolve 4.0 g NaESOi in water and dilute to a total volume of 500.0 mi... IMMIL é? dissolve 10.0 g NaESO4 in water and dilute to a total volume of 500. 0 mL. d. combine 2.0 g NaZSO4 and 500.0 g of water. Lmfl%.J—-— ‘4 84.0) e. combine 2.0 g NaESO4 and 500.0 mi. ofwater. 10" What is the partial pressure of Ne gas if a closed flask contains 40 g ofNe and 40 g of Ar and the total pressure is 120 torr? has/A! _, :10. 40 torr (9‘pr WV 31!“, ”L 3M] 4:!“ 80 torr J ' C. 180 torr L9,”) fizz,” q” I”) :- [101%, d. 240 torr e. 360torr &’ g 1”,”; 1204M)5fg+nf t» 4,5 ( Inc-f; ...
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