E3formAKey - Em 3-”6007 ”5&7(Arr/n 4 1 What is the...

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Unformatted text preview: Em 3-”6007 ”5&7 (Arr/n 4) 1. What is the volume occupied by 20 g ofneon gas at STPP 224L 44.8L C26} Led/f. 2.2.4}, ‘33 c. 11.2L 243” WI 22", l’ d. 67.2 L e. 33.6 L 2. Which gas has hydrogen bonding as one ofits intermolecular forces? a. CHaBr b. S':—l4 c. Ejr d. p 'opane, CHaCHzCl—la CHaNI-lgm Lu Al’l/ 6M! 3. What is tae concentration in ppm for a solution ofpotassium bromide that is 0.020%w/w? 0.0002 ppm a. 6 2 200 ppm ’ o 0 d. 2 J e. 2 300 ppm 0,000 ppm 4. Which of the following conflicts with the kinetic molecular theory of gases? W a. Gas particles occupy a negligible volume compared to the volume of their container. b. The average kinetic energy of the particles is proportional to the absolute temperature. c. Gas particles are in constant, random motion. I ~ ~ " if " d. There are no forces that act between the gas particles. (”lg-WM: m t,“ a, Gas particles anly when they collide with the container walls. 5. A gas occupies 8.0 L when the pressure is 5.0 atm and the temperature is 50.0 K. What is the temperature if the same sample of gas occupies 4.0 L at a pressure of 2.0 atm? 3' 0064 K fl" .5, vaz... )0! VI 7-2. r“ P2,. V's-T} b. 0.10 K —--"""" 2.- c. 1.0K T! T 72‘ -..:. Pad/'2...“ 10. K “4"?" P: V; e. 40. K / laym‘fl 7.2-” :3. Lz.ofl9.8LX;0-OQ 6. Which would have sitive value f . W a. water vapor condenses on a cold surface L5. o~hl"o if) b. solutions of NaBr and Pb (NO3)2 are combined, forming a precipitate G carbohydrates are broken down in cells, releasing carbon dioxide and water d. a and b / e. aandc M‘bé’} 63...)“. 7. Assuming all gases are at the same temperature and pressure. how many liters of oxygen gas are needed to react completely with 2.0 L of ammonia gas? 2A., '3 4NH3(g) + 5 C52(g) l_l 4NO(g) + 6 HzCXg) a. 5.0 .1, 02 gas L- b. 1.6 .; 02 as 5‘ <92, . g (2.01.404 -:=- 2.5.102 . c. 1.3 ._, 02 gas 4 ”I; (:9 2.5 .; 02 gas L ‘3 e. 10. .'_, 02 gas 8. How much heat is needed for the following transformation involving 20.0 g ofwater? H20 (solid) @ 0.0%: —> H20 (liquid) @ 40.0Oc (Hint: Two separate calculations are necessary! Useful info on the front of the exam.) :1 225:“: tngzgfie—O +0» :1 gym) c. 11.6 kcal . . c 4'" G- a, 2.22:: .443?” MM 2 r ”A?“ 9. A flask contains 4.0 moles of He gas. \When 10.0 grams of hydrogen gas, H2, afldded to the flash, the pressure is observed to increase to 18 atm. What is the partial pressure of the hydrogen gas? a. 5.0atrn ’0‘} ”a, a .S‘Ml/AZZ. ”a“ QA/ b. 7.2atrn c. 8.0 atm ”A, gMO/fl?’ ..... +9.; P ---= as.» C? 1:... 77.7.4.4: 4.. W. > 10. A given mass of oxygen at room temperature occupies a volume of 500.0 mL at 1.50 atm pressure. What pressure must be applied to compress the gas to a volume of only 150.0 ml? a. 500 atm r. R U; "" fig, V2. b. 150 atm 5.00 atrn V (I. 90ml») GD pz 2:. £31.... :3, $451M :5. 5.0!)". d. 1.50 atm 0’ z. lsanib e. 0.500 atm 11. If 400 mL ofwater were added to 0.40 mole @hat would be the approximate concentration of sodium ions in the resulting solu 'on? M II "’ a. 1.0 M 3 a- csp 0M ”.3 Péq '7 c. 0.75 M V d. 0.33M 0.4mIfl/Q3P6g ”h” *3 93”]4/“4' e. 0.0030 M f a . 4 L SJ n 12. Which is the best description of the forces that would be present in a sample of the compound shown here? @ E. H H 0 5w} can} F—(IS—(IE—(I‘l—S—H POIM’ ' ' do #'£M”3» H H Only London dispersion forces are present. Only dipole—dipole forces are present. London dispersion forces and hydrogen—bonding forces are present. London dispersion forces and dipole—dipole forces are present. London dispersion forces, dipole—dipole forces and hydrogen—bonding forces are present. 13. Octane, CH3CH2CH2CH2CH2CH2CH2CH3, will likely dissolve more ofwhich solute? @ b. c. d. e. CCli flour/ll” H ”on feign? magnesium sulfate {CUE-I water ’9’“ glucose, a sugar with formula CGI—IlZOLS POI”. None of the above compounds is appreciably soluble in octane. 14. What is the concentration ifa 4.0 M salt solution is diluted by a factor of 8? a. b. C. 0 E. 3:33. (“mg—v:- 0.5;” 0.30 M 0.50 M M “W“; films. Mo W. 15. The enthalpy change, AH, is 43.2 kcal for the reaction: N2 + O2 —) 2 NO El. @ C. Formation of 120 g @mwfll result in being 43.2 kcal, absorbed I? 4-16 *'-" 3°) 86. 4 kcal; absorbed ‘73:; 173 kcal; absorbed 21.6 kcal; released KI 20.} ”01 L!!!" qg.2k€be 7:" 2“ qu‘e. d. 30 e. 86.4 kcal; released ‘5 2’”, ”0 16. The following reaction iW: 2 KCIOg (s) + 02 (g) —> 2 KC1C>4 (s) and. AS a} a. The reaction is never spontaneous, regardless of the temperature. ”5 b. The reaction is spontaneous at all temperatures. 5 4- 3 vi) .5 Q The reaction is spontaneous at sufficiently low temperaturem d. The reaction is spontaneous at sufficiently high temperatures. fa ; w“; if M More information is needed to comment on the spontaneity of this reaction.“ /I ' W W. 1‘91 "w“, Nays “w" M- =54 «7A5 17. 18. 19. 20. 21. 22. What is the value ofAG at 298K for a reaction ifAH : 43.7 kcal and AS : 43.0152 kcal/K. _39.2 kcal M c A)? ”Tb} ——39.2 kcal --43.3 kcal =7— —- 3 age; 1 “£22.78 '" 0-WSZt-6'LJ —~-3.3 kcal q xx { ) J82 kcal '-'-"- w 9.2..Lgpi How many moles ofgas are in gas—filled balloon that has a volume of 67.0 L when the pressure is 742 mm Hg and the temperature is 250C? 2.. (D C. d. E. 2.24 mol Pt] 3" fl ATL 2.67 mol P (/ %X¢7L ) 2.81 mol n... $2. (97”! 31.9 mol A 7" 0W” 1.71 X 103 mol Which of the following gases would behave most like an ideal gas? C? b. c. d. e. N2 gas HF gas NI-Ia gas a", 0L,” WI” Am flit)“: “\4' water vapor I ,hfind‘bu lulu/w Mata/es CH5C1 vapor \Which of the following aqueous solutions will have the “flest boiling mpofifi push!“ Ei. @ c. d. El. 9“?) c. d. 4. 0 M glucose (a covalently —bonded sugar) 91" 1. 5 M sodium sulfide NagS Q, ‘- 2.0 M calcium sulfate, CaSOM.’ K3 :5 F ”p 4' 2,.— 0.8 M magnesium bromide 3.4 M— I 1.5 M sodium chloride 3‘ 01"," flaws How many mL of 12.0 M HCl are needed to prepare 250.0 I'I’LL of 2.50 M HCl solution? :3“? Mull: ”' ”123/2... . m_, 2.50 m; {2'951253’9 ’02-‘31 ?) 5.21 In} 52.1 m; 5'sz 1f 500 mL of a 0.28 M BaC12 solution were evaporated to dryness, how many grams ofBaC12 salt would be recovered? a. (39 C. 7.3g L 137.3 "#2853433 *9 may/fl, 29.2 484: . 9'), 0-23 2:? L” )é—ZE’X‘“ 3;) are 23. The number of molecules of gas in a rigid—walled container is dou led and the tempera reduced to one—sixth the original Kelvin temperature. What is the effect on the pressure? ' increase by a factor of 2. p 0C ’3 2.1 P b. The pressure wi. ' c. The pressure wi. ' . 0‘. T {P The pressure wil be oneethird the original pressure. a) ,_ e. :he pressure wil be one—twelfth the original pressure. 24. .‘ .-. .. s of cesium acetate should be added to water 0 n. 10.0% . .. . 1.0 g [a I. b. 10. g ( 1666') G) 1.0 >< 102 g ’0”) ,_ a. :he pressure d. 1.0 X 103 g e. 1.0 X 10—1 g 25. Arrange the following gases in order ofincreasing average speed at 95°C. He<Ne<Ar<H2 5'6“!!! and; a. b. He<Ne<H2<AI c. Ne<Ar<H2<He d. He<Ar<Ne<H2 @ Ar<Ne<He<H2 Use the following chemical equation for questions 26 and 27 on LeChatelier’s Principle. KM-l' + [email protected]+ 33¢) r. 2C1F3{g) 26. If this is an endothermic reaction, what is the effect of coolin contai er and its contents? "‘ C Ami a. the concentration of C12 will decrease © (3ng will decompose to form additional reactants c. the reaction will shift toward products I M_# {W M d. C12 and F2 will react to produce more C1F5 e. adding or removing heat will not have any effect on this reaction 27. Which of the following changes will cause a shift to the right? E‘/ 5) adding 2 1) increasing pressure 3) removing Clg 2) decreasing pressure 4) removing ClF 6) adding C1F3 a. 2, 4, and5 . b. 1,1de Malc- 4mm! Mm c. 1, 3, and 5 1,——, and5 e. 2, —-, and 6 28. What is tie equilibrium constant expression for the following reaction? ”0k: “mfg”! 2BrF5(g) : Br2(g) + 5F2(g) $11.1 Woof d [3:13.12 ’aw 0* [:2 ]5 [Bra] MS “I”: ‘ Farm] e [BIFslfBrgl arm ' [F215 [3'gl+5[Fgl .9. '5" Use the following energy diagram for problems 29 through 31. Assume the horizontal grid lines in this diagram are spaced at 1 k] intervals. Note: The diagram includes curves for the “uncatalyzed” reaction and for the reaction in the presence of a catalyst. 29. 30. 31. What is AG for this reaction? --i.5 1g --3.0 is —4.0 k} _5.5 1g _7.0 kj \W/hat is the activation energy (33) for this reaction in the absence of the catalyst? 2.. CE? C. d. E. --1.5 lg "3.0 r: .2 "4.0 r: .2 "5.5 k .2 "7.0 r: .2 What is the activation energy (33) for this reaction in the Eresnece ofthe catalyst? W "1.5;: .2 --3.0 1% [MM Ea. "40$ .2 "55$ .2 "7.0 r: .2 32. 33. 34. 35. 1.04 x 101? / , an» Rubbing alcohol is 70% v/v isopropyl alcohol in water. Which description correctly describes preparatio’i of this solution? a. co "ribine 70 m_'_, ofisopropyl alcohol and 30 mL ofwater. b. co "ribine 30 m_'_, ofisopropyl alcohol and 70 mL ofwater. G place 70 m; ofisopropyl alcohol in a volumetric flask and dilute to exactly 100 ml, with WE ter. d. place 30 m; ofisopropyl alcohol in a volumetric flask and dilute to exactly 100 ml, with WE ter. e. Don’t mark E! 9119“?" At a certs n high altitude, the air pressure is 0.00100 torr and the temperature is —1800C. How many molecules are there in 1 liter of air under these conditions? a. 1.31 x 104 pug ,g-r' Lian? X 19 ,6 . b. 8.9 10 fix, 50 mm WXIL) c. 1.725X10—5 ”a. RT 1".- fi7qu/Dwffld/ a 6.0mm 0. %fl 9314) JIAwfi: "blade! .I Consider the reversible reaction: Ag) ‘3 23 (g). At equilibrium, the concentration ofA is 0.381 M and the concentration of B is 0.154 M The value of K is and is the predominant material present at equilibrium. 0.0622; A £837... (0' 15-102.. b. O.404;A Kat-W =- .....---—---~----- 5 0.0!.22. c. 1.06; 3 A j 033/ £ 4 I? sew-RI d. 2.47; 3 e. 16.1;3 5; 3:3 'Zrm“owt 4 I3 ‘5) @eiydi’. .3 Two compartments are separated by a semipermeable membrane. Both compartments contain aqueous solutions of potassium chloride, but at different concentrations, as shown. 5337 “1.7 {OIM¥ cm ms: mmkm. 47125 [47 Which best describes this system as it attempts to reach equilibrium? A ML a“ , Solvent will move from left to right across the membrane. Idlulhm ’ b. Solute particles will move from left to right across the membrane. c. Solvent will move from right to left across the membrane. d. Solute particles will move from right to left across the membrane. e. Both solvent and solute will cross the membrane as this system attempts to equilibrate. 36. Which of the following forms ions when dissolved in water? a. glucose b. CHI—122011 c. carbon tetrachloride G) -'a20 A" 0 37. If 500 mL of 0.2 M sodium nitrate solution and 500 mL of 0.4 M potassium nitrate solution are combined, What is the nitrate ion concentration in the resulting solution? a. 3.2 M flout/03 Kit/0’; as. 3.23 0.7,!!! 2903'” 0'4!" 4W: :I 3.2% My 71/41 Windej‘a) We. . “In 38. Which statement is true about a phase change for water? a. Eleat is absorbed when water freezes. b. AS is positive in going from liquid water to ice. C9 Heat is released when steam condenses to give liquid water. M L”; 'I :1. AH is negative in going from ice to liquid water. e. None of the above. 39. A reaction will a ye be spontaneous 1‘f/ l. AG<O. ll. AH<OandAS>O lll. AH>OandAS<O a. I only ll only C. III only a l and H e. H and Ill 40. Which gas has London dispersion as its only intermolecular force? carbon monoxide, CO a. b. SL fur dioxide, 802 c. P d3 d. E20 F2 21°11de 41. A process that releases heat to the surroundings is said to be exothermic and the enthalpy change is negative. b. is said to be exothermic and the enthalpy change is positive. c. is said to be endothermic and the enthalpy change is negative. d. can only be spontaneous if TAS < 0 e. can only be spontaneous if AS < O ...
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