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SectionI Three hoursareallotted forthis examination. Onehour and30minutes areallotted forSection I,which consists of multiple-choice questions.ForSection II,Part A,40 minutes areallotted; forSection II,Part B,50 minutes areallotted. Section Iis printed inthis examination booklet.SectionIIisprinted inaseparate booklet. Time -1hour and30minutes Number ofquestions -75 Percent oftotal grade -45 This examination contains75multiple-choice questionsand5survey questions. Therefore, please be careful tofill inonly theovals thatarepreceded bynumbers 1through 80onyour answer sheet. NO CALCULATORS AREALLOWED. INDICATE ALLYOUR ANSWERS TOQUESTIONS INSECTION ION THE SEPARATE ANSWERSHEET. No credit willbegiven foranything writteninthis examination booklet,butyou may usethebooklet fornotes or scratchwork. Afteryouhave decided whichofthe suggested answersisbest, COMPLETELY fillinthe corresponding oval onthe answer sheet.Giveonlyoneanswer toeach question. Ifyou change ananswer, besure thattheprevious mark iserased completely. Chicago isa (A) state (B) city (C) country (D) continent (E) village Many candidates wonderwhether ornot toguess theanswers toquestions aboutwhich theyarenot certain. Inthis section ofthe examination, asacorrection forhaphazard guessing,one-fourth ofthe number ofquestions youanswer incorrectly willbesubtracted fromthenumber ofquestions youanswer correctly. Itis improbable, therefore,thatmere guessing willimprove yourscore significantly; itmay even lower yourscore, anditdoes taketime. If,however, youare not sure ofthe correct answer buthave some knowledge ofthe question andareable toeliminate oneormore ofthe answer choices aswrong, yourchance ofgetting theright answer isimproved, anditmay betoyour advantage toanswer such aquestion. Use your timeeffectively, workingasrapidly asyou canwithout losingaccuracy. DonQt spend toomuch timeon questions thataretoodifficult. Goontoother questions andcome backtothe difficult oneslaterifyou have time. Itis not expected thateveryone willbeable toanswer allthe multiple-choice questions. Copyright ©1999 College Entrance Examination BoardandEducational TestingService. Allrights reserved. Certain testmaterials arecopyrighted solelyinthe name ofETS.
I 2 H He 1.0079 4.0026 3 4 567 8 910 Li Be B C N 0 F Ne 6.941 9.012 10.811 12.01114.007 16.0019.0020.179 11 12 13141516 17 18 Na Mg AlSi P S CI Ar I 22.99 24.30 26.9828.0930.974 32.0635.453 39.948 19 20 2122 2324 2526 2728 29 303132 33 34 3536 K Ca Sc Ti V Cr Mn Fe Co NiCu Zn Ga GeAs SeBr Kr 39.10 40.08 44.9647.90 50.9452.0054.938 55.8558.93 58.6963.55 65.3969.7272.59 74.92 78.9679.90 83.80 37 38 3940 41 424344 4546 47 4849 5051 5253 54 Rb Sr Y Zr Nb Mo TcRu Rh Pd Ag Cd In Sn Sb Te I Xe 85.47 87.6288.9191.22 92.91 95.94 (98)101.1 102.91 106.42 107.87112.41 114.82 118.71121.75 127.60 126.91131.29 55 565772 7374 7576 77 78 79 8081 82 83 84 85 86 Cs Ba *La HfTa W Re Os IrPt Au Hg TIPb BiPo At Rn 132.91 137.33138,91 178.49 180.95183.85 186.21 190.2192.2195.08 196.97 200.59 204.38 207.2208.98 (209) (210)(222) 87 8889 104 105 106 107108 109 Fr Ra tAc Unq Unp Unh UnsUno Une (223) 226.02 227.03 (261)(262) (263) (262)(265) (266) 58 59 60 6162 6364 65 66676869 7071 Ce PrNd PmSm Eu Gd Tb Dy Ho ErTm YbLu 140.12 140.91144.24 (145) 150.4151.97 157.25158.93 162.50 164.93167.26 168.93 173.04 174.97 90 91 92 9394 9596 979899100 101 102103 Th Pa U Np Pu Am Cm Bk CfEsFm Md NoLr 232.04 231.04 238.03237.05 (244) (243)(247) (247) (251)(252)(257) (258) (259)(260)
SectionI CHEMISTRY SECTION I Note: Forallquestions, assumethatthetemperature is298 K,the pressure is1.00 atmosphere, andsolutions are aqueous unlessotherwise specified. T = temperature P = pressure V = volume S = entropy H= enthalpy G = free ener R = molar gasconstant n = number ofmoles M = molar m = molal L, mL = liter(s), milliliter(s) g = gram(s) nm = nanometer(s) atm = atmosphere(s) J, kJ = joule(s), kilojoule(s) V = volt(s) mol = mole(s) Directions: Eachsetoflettered choicesbelowreferstothe numbered statements immediately followingit.Select the one lettered choicethatbest fitseach statement andthen fillinthe corresponding ovalonthe answer sheet.A choice maybeused once, morethanonce, ornot atall ineach set. (A) Activation ener (B) Free ener (C) Ionization ener (D) Kinetic ener (E) Lattice ener 1. The ener required toconvert aground-state atom in the gas phase toagaseous positive ion 2. The ener change thatoccurs inthe conversion of an ionic solidtowidely separated gaseousions 3. The ener inachemical orphysical changethatis available todo useful work 4. The ener required toform thetransition stateina chemical reaction
Questions5-8refer toatoms forwhich theoccupied atomic orbitais areshown below. (A) Is__ 2s_l_ (B) 1 s --.-1L 2s--.-1L (C) Is--.-1L2s --.-1L2 p_l 1_ (D) 1 s --.-1L 2s -.1L2 P --.-1L --.-1L--.-1L (E) [Ar] 4s--.-1L3d--.-1L_I II I_ Questions 9-12refer toaqueous solutions containing 1: 1mole ratios ofthe following pairsofsubstances. Assume allconcentrations are1 M. (A) NH) andNH4Cl (B) H)P04 andNaH2P04 (C) HCl andNaCI (D) NaOH andNH) (E) NH3 andHCZH)OZ (aceticacid) GOONTOTHE NEXT PAGE
Questions 13-16refertothe following descriptions of bonding indifferent typesofsolids. (A) Lattice ofpositive andnegative ionsheld together byelectrostatic forces (B) Closely packedlatticewithdelocalized electrons throughout (C) Strong singlecovalent bondswithweak intermolecular forces (D) Strong multiple covalent bonds(including n-bonds) withweak intermolecular forces (E) Macromolecules heldtogether withstrong polar bonds Section I (A) Lithium (B) Nickel (C) Bromine (D) Uranium (E) Fluorine
Directions:Eachofthe questions orincomplete statementsbelowisfollowed byfive suggested answersorcomple- tions. Select theone thatisbest ineach caseandthen fillinthe corresponding ovalonthe answer sheet. 19-. Which ofthe following bestdescribes therole ofthe spark from thespark pluginan automobile engine? (A) The spark decreases theener ofactivation forthe slow step. (B) The spark increases theconcentration ofthe volatile reactant. (C) The spark supplies someofthe ener ofactivation for the combustion reaction. (D) The spark provides amore favorable activatedcomplex for the combustion reaction. (E) The spark provides theheat ofvaporization forthe volatile hydrocarbon. 20. What massofAu isproduced when0.0500 molofAUZS3 IS reduced completely withexcess Hz? (A) 9.85 g (B) 19.7 g (C) 24.5 g (D) 39.4 g (E) 48.9 g 21. When asolution ofsodium chloride isvaporized inaflame, the color ofthe flame is (A) blue (B) yellow (C) green (D) violet (E) white 22. Ofthe following reactions,whichinvolves thelargest decrease inentropy? (A) CaC03(s) ~CaO(s) +COz(g) (B) 2 CO(g) +oz{g) ~ 2 COz(g) (C) Pb(N03)z(s) +2KI(s) ~Pblz{s) +2KN03(s) (D) C 3 H 8 (g) +50z(g) ~3COz(g) +4HzO(g) (E) 4La(s) +30z(g) ~2Laz03(s)
23.Ahot-air balloon, shownabove, rises.Which of the following isthe best explanation forthis observation? (A) The pressure onthe walls ofthe balloon increases withincreasing temperature. (B) The difference intemperature betweentheair inside andoutside theballoon produces con- vection currents. (C) The cooler airoutside theballoon pushesin on the walls ofthe balloon. (D) The rateofdiffusion ofcooler airisless than that ofwarmer air. (E) The airdensity insidetheballoon isless than that ofthe surrounding air. Section I 24. The safest andmost effective emergency proce- dure totreat anacid splash onskin isto do which of the following immediately? (A) Dry theaffected areawith paper towels (B) Sprinkle theaffected areawith powdered Na 2 S0 4 (s) (C) Flush theaffected areawith water andthen with adilute NaOH solution (D) Flush theaffected areawith water andthen with adilute NaHC0 3 solution (E) Flush theaffected areawith water andthen with adilute vinegar solution GO ONTO THE NEXT PAGE
25.The cooling curveforapure substance asitchanges fromaliquid toa solid isshown above. Thesolid andtheliquid coexist at (A) point Q only (B) point R only (C) allpoints onthe curve between Qand S (D) allpoints onthe curve between Rand T (E) nopoint onthe curve 26. When theequation aboveisbalanced andallcoefficients arereduced to their lowest whole-number terms,thecoefficient for 02(g) is (A) 6 (B) 7 (C) 12 (D) 14 (E) 28 27. Appropriate usesofavisible-light spectrophotometer includewhichof the following? I. Determining theconcentration ofasolution ofCu(N03 h II. Measuring theconductivity ofasolution ofKMn04 III. Determining whichionsarepresent inasolution thatmay contain Na+,Mg2+, A13+ (A) Ionly (B) IIonly (C) IIIonly (D) Iand IIonly (E) Iand IIIonly GOONTO THE NEXT PAGE
SectionI 28. The melting pointofMgO ishigher thanthatofNaF. Explanations for this observation includewhichofthe following? 1. Mg2+ ismore positively chargedthanNa+. II. 0 2- ismore negatively chargedthanP-. III. The 0 2-ionissmaller thanthe P- ion. (A) IIonly (B) Iand IIonly (C) Iand IIIonly (D) IIand IIIonly (E) I,II, and III o II CH -C-CH -CH 3 23 29. The organic compound represented aboveisan example of (A) anorganic acid (B) analcohol (C) anether (D) analdehyde (E) aketone 30. Which ofthe following istrue regarding thereaction represented above? (A) The oxidation numberof 0 does notchange. (B) The oxidation numberofHchanges from-Ito+1. (C) The oxidation numberofFchanges from+1to -1. (D) The oxidation numberofSe changes from-2 to +6. (E) Itis adisproportionation reactionforF. 31. Ifthe temperature ofan aqueous solutionofNaCI isincreased from 20°C to90°C, whichofthe following statements istrue? (A) The density ofthe solution remainsunchanged. (B) The molarity ofthe solution remainsunchanged. (C) The molality ofthe solution remainsunchanged. (D) The mole fraction ofsolute decreases. (E) The mole fraction ofsolute increases.
32.Types ofhybridization exhibitedbythe Catoms in propene, CH3CHCH2, includewhichofthe following? 1. sp II. sp2 III. sp3 (A) I only (B) III only (C) I and II only (D) II and III only (E) I,II, and III 33. A1.0 Lsample ofan aqueous solutioncontains 0.10 molofNaCI and0.10 molofCaCI2. What is the minimum numberofmoles ofAgN0 3 that must beadded tothe solution inorder toprecipi- tate allofthe CI- asAgCI(s) ?(Assume that AgCI isinsoluble.) (A) 0.10 mol (B) 0.20 mol (C) 0.30 mol (D) 0.40 mol (E) 0.60 mol Questions 34-35refertoan electrolytic cellthat involves thefollowing half-reaction. 34. Which ofthe following occursinthe reaction? (A) AIP63- isreduced atthe cathode. (B) Alisoxidized atthe anode. (C) Aluminum isconverted fromthe-3 oxi- dation statetothe 0oxidation state. (D) P-acts asareducing agent. (E) P-isreduced atthe cathode. 35. Asteady current of10amperes ispassed through an aluminum-production cellfor15minutes. Which ofthe following isthe correct expression for calculating thenumber ofgrams ofaluminum produced? (1 faraday = 96,500 coulombs) (A) (10)(15)(96,500) (27) (60) g (B) (10) (15)(27) (60) (96,500) g (C) (10) (15)(60) (27) (96,500) (3) g (96,500) (27) (D) (10) (15)(60) (3) g (27) (3) (E) (96,500) (10)(15)(60) g
SectionI Initial Rateof Initial [NO] Initial[02] Formation ofN02 Experiment (molL-I) (molL -1) (molL- 1 s- 1) 1 0.10 0.102.5 x 10-4 2 0.20 0.105.0 x 10-4 3 0.20 0.40 8.0 x 10- 3 36. The initial-rate datainthe table above wereobtained forthe reaction represented below.Whatisthe experimental ratelawforthe reaction? (A) Rate = k[NO][02] (B) Rate = k[NO][02 f (C) Rate = k[NO]2 [° 2] (D) Rate = k[NO]2 [° 2]2 (E) Rate = k[NO] [°2] Ionization Energiesforelement X(kJ mor l) First Second ThirdFourth Fifth 580 1,815 2,74011,600 14,800 37. The ionization energiesforelement Xare listed inthe table above. On the basis ofthe data, element Xismost likely tobe (A) Na (B) Mg (C) Al (D) Si (E) P 38. Amolecule oran ion isclassified asaLewis acidifit (A) accepts aproton fromwater (B) accepts apair ofelectrons toform abond (C) donates apair ofelectrons toform abond (D) donates aproton towater (E) hasresonance Lewiselectron-dot structures
41.After theequilibrium representedaboveisestab- lished, somepure 02 (g) isinjected intothe reaction vesselatconstant temperature. After equilibrium isreestablished, whichofthe fol- lowing hasalower valuecompared toits value at the original equilibrium? (A) Keqforthe reaction (B) The total pressure inthe reaction vessel (C) The amount ofS03 (g) inthe reaction vessel Temperature (OC) (D)The amount of 02 (g) inthe reaction vessel 39. The phase diagram forapure substance isshown above. Which pointonthe diagram corresponds to the equilibrium betweenthesolid andliquid phases atthe normal melting point? (E) Theamount ofS02 (g) inthe reaction vessel (A) A (B) B (C) C (D) D (E) E 40. Ofthe following molecules, whichhasthelargest dipole moment? (A) CO (B) CO 2 (C) 02 (D) HF (E) F 2
SectionI 42. When theequation aboveisbalanced andallcoefficients reducedtolowest whole- number terms,thecoefficient forOH-(aq) is (A) 1 (B) 2 (C) 3 (D) 4 (E) 6 43. Asample of61.8 gof H3B03, aweak acid,isdissolved in1,000 gof water to make a1.0-molal solution.Whichofthe following wouldbethe best procedure to determine themolarity ofthe solution? (Assumenoadditional information is available.) ,(A) Titration ofthe solution withstandard acid (B) Measurement ofthe pH with apH meter (C) Determination ofthe boiling pointofthe solution (D) Measurement ofthe total volume ofthe solution (E) Measurement ofthe specific heatofthe solution 44. Arigid metal tankcontains oxygengas.Which ofthe following appliestothe gas in the tank when additional oxygenisadded atconstant temperature? (A) The volume ofthe gas increases. (B) Thepressure ofthe gas decreases. (C) The average speedofthe gas molecules remainsthesame. (D) Thetotal number ofgas molecules remainsthesame. (E) The average distance between thegas molecules increases. 45. What isthe H+(aq) concentration in0.05 MHCN(aq) ?(The Kafor HCN is 5.0 x 10- 10.) (A) 2.5 x la- 11 M (B) 2.5 x 10- 10 M (C) 5.0x10- 10 M (D) 5.0 x 10- 6 M (E) 5.0 x 10- 4 M 46. Which ofthe following occurswhenexcess concentrated NH 3 (aq)ismixed thoroughly with0.1 MCu(N0 3 h(aq) ? (A) Adark redprecipitate formsandsettles out. (B) Separate layersofimmiscible liquidsformwithablue layer ontop. (C) Thecolor ofthe solution turnsfromlightbluetodark blue. (D) Bubbles ofammonia gasform. (E) ThepHofthe solution decreases. GOON TOTHE NEXT PAGE
47.When hafnium metalisheated inan atmosphere 51. Which ofthe following isacorrect interpretation of chlorine gas,theproduct ofthe reaction is of the results ofRutherford's experimentsin found tocontain 62.2percent Hfbymass and which goldatoms werebombarded withalpha 37.4 percent Clbymass. Whatisthe empirical particles? formula forthis compound? (A)Atoms haveequal numbers ofpositive and j! (A)HfCl negative charges. ! (B)Electrons inatoms arearranged inshells. (B) HfCl2 (C)Neutrons areatthe center ofan atom. (C) HfCl3 (D) Neutrons andprotons inatoms havenearly (D) HfCl 4 equal mass. (E) Thepositive chargeofan atom isconcen- (E) Hf2Cl3 tratedinasmall region. 48. If 87.5 percent ofasample ofpure 1311decays in 52. Under whichofthe following setsofconditions 24 days, whatisthe half-life of1311? could themost 02(g) bedissolved inH20(l) ? (A) 6days Pressure of02(g) Temperature i (B) 8days Above H20(l) ofH2O(I) (C) 12days (atm) (DC) (D) 14days (A)5.0 80 I (E) 21days (B)5.0 20 I (C) 1.0 80 49. Which ofthe following techniques ismost appro- (D)1.0 20 II priate forthe recovery ofsolid KN03 froman (E) 0.5 20 II, aqueoussolution ofKN03 ? II (A)Paper chromatography W(g)+X(g) ~Y(g) +Z(g) i (B)Filtration I: [i, (C) Titration 53.Gases Wand Xreact inaclosed, rigidvessel to (D) Electrolysis I" (E)Evaporation todryness form gases Yand Zaccording tothe equation above. Theinitial pressure ofW(g) is1.20 atm 50. In the periodic table,asthe atomic number andthat ofX(g) is1.60 atm. NoY(g) orZ(g) increases from11to17, what happens tothe isinitially present. Theexperiment iscarried out atomic radius? atconstant temperature. Whatisthe partial pres- (A) Itremains constant. sureofZ(g) when thepartial pressure ofW(g) (B) Itincreases only. hasdecreased to1.0 atm? (C) Itincreases, thendecreases. (A)0.20 atm (D) Itdecreases only. (E) Itdecreases, thenincreases. (B) 0.40 atm (C) 1.0atm (D) 1.2atm (E) 1.4atm
SectionI 54. Which ofthe following changesalonewould causeadecrease inthe value of K eq forthe reaction represented above? (A) Decreasing thetemperature (B) Increasing thetemperature (C) Decreasing thevolume ofthe reaction vessel (D) Increasing thevolume ofthe reaction vessel (E) Adding acatalyst 55. According tothe balanced equationabove,howmany moles of ill would beneces- sary toproduce 2.5mol of12, starting with4.0mol ofKMn04 and3.0mol of H 2 S0 4 ? (A) 20. (B) 10. (C) 8.0 (D) 5.0 (E) 2.5 56. Ayellow precipitate formswhen 0.5 MNaI(aq) isadded toa 0.5 Msolution of which ofthe following ions? (A) Pb2+(aq) (B) Zn 2 +(aq) (C) CrO/-(aq) (D) SO/-(aq) (E) OH-(aq) M(s) + 3 Ag+(aq) ~ 3 Ag(s) +M3+(aq) Ag+(aq) +e- --.; Ag(s) £0 = + 2.46 V EO = + 0.80 V 57. According tothe information above,whatisthe standard reduction potentialforthe half-reaction M 3 +(aq)+3e- ~ M(s)? (A) -1.66 V (B) -0.06 V (C) 0.06V (D) 1.66V (E) 3.26V
58.Onamountaintop, itis observed thatwater boils at 90 o e, notat1000e asatsea level. Thisphe- nomenon occursbecause onthe mountaintop the (A) equilibrium watervaporpressure ishigher due tothe higher atmospheric pressure (B) equilibrium watervapor pressure islower due to the higher atmospheric pressure (C) equilibrium watervapor pressure equalsthe atmospheric pressureatalower temperature (D) water molecules haveahigher average kinetic ener duetothe lower atmospheric pressure (E) water contains agreater concentration of dissolved gases 59. A40.0 mLsample of0.25 M KOH isadded to 60.0 mLof0.15 M Ba(OH)z' Whatisthe molar concentration of OH-(aq) inthe resulting solu- tion? (Assume thatthevolumes areadditive.) (A) 0.10 M (B)0.19M (C) 0.28 M (D) 0.40 M (E) 0.55 M 60. A0.03 molsample of NH 4 N0 3 (s) isplaced in a IL evacuated flask,which isthen sealed and heated. The NH 4 N0 3 (s) decomposes completely according tothe balanced equationabove.The total pressure inthe flask measured at400 Kis closest towhich ofthe following? (Thevalue of the gas constant, R,is0.082 Latm mol- 1 K- 1.) (A) 3atm (B) 1atm (C) 0.5atm (D) 0.1atm (E) 0.03 atm 61. Forthereaction ofethy lene represented above, !:lH is-1,323 kJ.What isthe value of !:lH ifthe combustion producedliquidwaterHzO(l), rather than water vapor H 2 0(g) ? (!:lH forthe phase change HzO(g) ~Hz0(l) is-44 kJmol-I.) (A) -1,235 kJ (B) -1,279 kJ (C) -1,323 kJ (D) -1,367 kJ (E) -1,41IkJ 30 ·1
62.The reaction represented abovehasanequilibrium constantequal to 3.7 x10 4. Which ofthe following canbeconcluded fromthis information? (A) CN-(aq) isastronger basethan C 2 H 3 0 2 -(aq). (B) HCN(aq) isastronger acidthan HC 2 H 3 0 2 (aq). (C) The conjugate baseof CN-(aq) isC2H3 0 2 -(aq). (D) Theequilibrium constantwillincrease withanincrease in temperature. (E) The pHofasolution containing equimolaramountsof CN- (aq) andHC z H 3 0 2 (aq) is7.0 . .:::' 4.05 ~ - 4.00 o 53.95 :::..... 234 Time (hours) 63. The graph above shows theresults ofastudy ofthe reaction ofX with alarge excess of Y to yield Z.The concentrations ofXand Y were measured overaperiod oftime. According tothe results, which ofthe following canbeconcluded abouttherate lawforthe reaction undertheconditions studied? (A) Itis zero order in [Xl (B) Itis first order in [Xl (C) Itis second orderin [Xl. (D) Itis first order in[Y]. (E) The overall orderofthe reaction is2. Section I
64.Equal numbers ofmoles ofHe(g), Ar(g),andNe(g) are placed inaglass vessel atroom temperature. Ifthe vessel has a pinhole-sized leak,which ofthe following willbetrue regarding therelative valuesofthe partial pressures ofthe gases remaining inthe vessel aftersome ofthe gas mixture has effused? (A) PHe < P Ne < PAr (B) PHe < PAr < P Ne (C) P Ne < PAr < PHe (D ) PAr < P He < P Ne (E) P He = PAr = P Ne 65. Which ofthe following compounds isNOT appreciably soluble inwater butissoluble indilute hydrochloric acid? (A) Mg(OHh(s) (B) (NH4hC03(s) (C) CuS04(s) (D) (NH4.hS04(s) (E) Sr(N03h(s) 66. When solidammonium chloride,NH4CI(s), isadded to water at25°C, itdissolves andthetemperature ofthe solution decreases. Whichofthe following istrue forthe values of !:J. Hand !:J. S for the dissolving process? !:J.H (A) Positive (B) Positive (C) Positive (D) Negative (E) Negative !:J.S Positive Negative Equal tozero Positive Negative 67. What isthe molar solubility inwater ofAg2Cr04 ? (The KspforAg2Cr04 is8x 10- 12.) (A) 8 x 10- 12 M (B) 2 x 10- 12 M (C) ~4 X 10- 12 M (D) ~4 x 10- 12 M (E) ~2 x 10- 12 M
68.Inwhich ofthe following processesarecovalent bonds broken? (A) I 2 (s) ~I 2 (g) (B) COis) ~CO 2 (g) (C) NaCl(s) ~NaCl(l) (D) C(diamond) ~C(g) (E) Fe(s) ~Fe(l) 69. What isthe final concentration ofbarium ions, [Ba 2 +], insolution when100.mLof0.10 M BaCliaq) ismixed with100.mLof0.050 M H2S04(aq) ? (A) 0.00 M (B) 0.012 M (C) 0.025 M (D) 0.075 M (E) 0.10 M 70. When 100mL of1.0 M Na3P04 ismixed with 100 mLof1.0 M AgN03, ayellow precipitate forms and[Ag+]becomes negligibly small. Which ofthe following isacorrect listingofthe ions remaining insolution inorder ofincreasing concentration? (A) [P043-] < [N03 -] < [Na+] (B) [POl-] < [Na+] < [N03-] (C) [N03-] < [POl-]
73.The volume ofdistilled waterthatshould be added to10.0 mLof6.00 MHCI(aq) inorder to prepare a0.500 MHC1(aq) solutionis approximately (A) 50.0mL (B) 60.0mL (C) 100. mL (D) 110.mL (E) 120. mL 75. Which ofthe following pairsofliquids formsthe solution thatismost ideal(most closely follows Raoult's law)? (A) C g H 1g (l) and H 2 0(l) (B) CH 3 CH 2 CH 2 0H(l) and H 2 0(l) (C) CH 3 CH 2 CH 2 0H(l) andC g H 1g (l) (D) C 6 H 14 (l) andC g H 1g (l) (E) H2S04(l) andH20(l) 74. Which ofthe following gasesdeviates mostfrom ideal behavior? (A) S02 (B) Ne (C) CH 4 (D) N 2 (E) H 2 IF YOU FINISH BEFORE TIMEISCALLED, YOUMAY CHECK YOURWORK ONTHIS SECTION. DO NOT GOONTOSECTION IIUNTIL YOUARETOLD TODO SO.
Listedbelowarethe correct answers tothe multiple-choice questionsandthepercentage of AP candidates who answered eachquestion correctly. Total Item Correct PercentCorrect by Grade Percent No. Answer 54321Correct Total Item .Correct PercentCorrect by Grade Percent No. Answer 54321Correct 94 89 253J. 80 . 73 32 34 39 24 6865 81 69 32}5 83 78 2913 931 31 19 18 9 6 25 74 66 5240 34 54 45 32 241921 31 93 8~ 2(1612 3.£_ 38 2818 73 2118 93 30J8 73 5016 80 2620 90 65 68 95 86