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1 CHEM1211KSpring2011 GeorgiaInstituteofTechnology 1.Whichcompoundiscorrectlynamed? A)HCl(aq) hydrogenchloride B)H2S sulfuricacid C)CoCl2 cobaltchloride D)VPO4 vanadium(iii)phosphate E)NaClO sodiumchlorite 2.Aradiowavehasafrequencyof3.8x10 10 s T1.Howmanyphotonsofthisradiation areneededtoproduce60.7jofenergy? A)2.52x10 T23 photons B)2.41x10 24 photons C)1.74x10 T44 photons D)1.88x10 17 photons E)Notenoughinformation 3.Ranktheemissionsintermsofincreasingenergy: I.n=5 n=4 II.n=3 n=2 III.n=2 n=1 A)I<II<III B)III<II<I C)II<I<III D)III<I<II E)TheenergiesofemissionsI,II,andIIIareallthesame 4.Whichstatementisfalse? A)Theprinciplequantumnumberindicatestheenergylevelandsizeofan orbital. B)Theonlyallowedvaluesforthespinquantumnumberare+½and ½. C)Thevaluesforthemagneticquantumnumberindicatethe orientationoftheorbitalsinspace. D)Thevaluel=2indicatesapeanutshapedorbital. E)Withanincreaseinenergylevel,anewtypeoforbitalbecomesavailable. Page 1

2 CHEM1211KSpring2011 GeorgiaInstituteofTechnology 5.Howmanyorbitalsinanatomcanhavethedesignation5f? A)5 B)7 C)14 D)25 E)50 6.Whichstatementistrue? A)A1.0Lsampleof0.200MCa(OH)2contains1.20x10 23 hydroxideions. B)Inadilution,thevolumeofsolutionremainsconstantwhilethemolesof solutedecreases. C)Thereare124molesofsolutein145.6mLof0.850Msodiumcyanide. D)Toprepare0.80Lof0.15M0NaCl,0.020Lof5.0MNaClmustbedilutedto atotalvolumeof800.ml. E)Ittakes21.1gofKItomake500.0mLof0.254MKIsolution. 7.Boronhastwoisotopes;oneoftheseisboronT10withamassof amuand apercentabundanceof19.91.iftheuniversalmassofboronis10.811,whatisthe massoftheotherisotopeofboron. A)11.01amu B)44.29amu C)14.02amu D)10.90amu E)Thereisnotenoughinformationtoanswerthisquestion. 8.Allofthesubstancesbelowarefertilizers.Whichistherichestsourceofnitrogen onamasspercentagebasis? A)Urea,(NH2)2CO B)Ammoniumnitrate,NH4NO3 C)Guanidine,HNC(NH2)2 D)Ammonia,NH3 E)Thereisnotenoughinformationtoanswerthisquestion Page 2

3 CHEM1211KSpring2011 GeorgiaInstituteofTechnology 9.DepictedbelowisareactionvesselcontainingamixtureofH2(g)andN2(g) beforethereactionbegins.thefilledspheresrepresentnitrogenandtheopen spheresrepresenthydrogen.giventheequationbelow,whichimagebest representsthevesselafterreactionoccurs? N2(g)+3H2(g) 2NH3(g) Page 3

4 CHEM1211KSpring2011 GeorgiaInstituteofTechnology 10.Howmanymolesofcarbonmonoxidearerequiredtoreactwithonemoleof O2(g)toproduce2molesofcarbondioxidegas? A)½ B)1 C)2 D)3/2 E)3 11.Whatarethespectatorionsinthereactionofsulfuricacidwithbarium hydroxide? A)Ba 2+ andso4 2T B)H + andoh T C)OH T andba 2+ D)H + andso4 2T E)Therearenospectatorionsinthisreaction. 12.Whichstatementbestexplainswhythefollowingionicradiitrendistrue? S 2T >Cl T >K + A)Zeffincreaseswiththenumberofelectrons. B)Thepotassiumionhastheleastamountofshielding,soZeffisgreatestfor it. C)Zeffincreaseswiththenumberofprotons. D)Theamountofshieldingisequal,butthenucleusofsulfurisleastpositive resultinginsmallestzeff. E)Theradiitrendaboveisnotcorrect. 13.Whichperiodictrendreferstotheabilityofanatominamoleculetoattract electronstoitself? A)electronaffinity B)ionizationenergy C)polarizability D)polarizingpower E)electronegativity Page 4

CHEM1211KSpring2011 GeorgiaInstituteofTechnology 14.Whichtransitionmetalionhastheelectronconfiguration[Ar]3d 3? A)V 3+ B)Mn 4+ C)Cr 3+ D)Fe 3+ E)Ti 2+ 15.

5 CHEM1211KSpring2011 GeorgiaInstituteofTechnology 14.Whichtransitionmetalionhastheelectronconfiguration[Ar]3d 3? A)V 3+ B)Mn 4+ C)Cr 3+ D)Fe 3+ E)Ti Whichisthebestresonancestructureforthesulfateion? 16.Whichmoleculeistrigonalpyramidal? A)SO2 B)AsBr3 C)BrF3 D)BH3 E)CH2O 17.Whichmoleculeorionispolar? A)XeF4 B)PCl3 C)CCl4 D)I3 E)BH3 Page 5

A)Lewistheory B)VSEPR C)Valencebondtheory D)Electronegativity E)Electronaffinity 20.WhichstatementregardingthefollowingLewisstructureistrue?

6 CHEM1211KSpring2011 GeorgiaInstituteofTechnology 18.Arrangethefollowinginorderofincreasingnetdipole(dipolemoment). A)I<II<III B)III<I<II C)II<III<I D)II<I<III E)I<III<II 19.Whichbestexplainsthepolarityofabond? A)Lewistheory B)VSEPR C)Valencebondtheory D)Electronegativity E)Electronaffinity 20.WhichstatementregardingthefollowingLewisstructureistrue? A)Thestructurehastoomanyelectrons B)Thestructurehasnoresonancestructures. C)Theformalchargedistributionpreventsitfromcontributingsignificantly totheresonancehybrid. D)Thestructureiswrongbecauseboroncannothaveacompleteoctet. E)Thestructureismissinganoverallcharge. Page 6

7 CHEM1211KSpring2011 GeorgiaInstituteofTechnology 21.WhatatomicorbitalsareinvolvedinthepibondfoundinO2? A)twosorbitals B)ansorbitalandaporbitalsorientedalongtheinternuclearaxis C)twoporbitalsorientedalongtheinternuclearaxis D)ansorbitalandaporbitalthatisperpendiculartotheinternuclearaxis. E)twoporbitalsthatareperpendiculartotheinternuclearaxis!! 22.Howmanyandwhattypeofatomicorbitalsmustbecombinedtoaccountfor thetetrahedralshapeofch4? A)2sorbitals B)4porbitals C)8porbitals D)1sand3porbitals E)2sand6porbitals 23.Whichofthefollowingspecieshasalongerbondlengthandwhy? N2orN2 + A)N2hasalongerbondbecauseitsbondorderissmaller B)N2hasalongerbondbecauseitsbondorderisgreater C)Bothspecieshavethesamebondlength D)N2 + hasalongerbondbecauseitsbondorderissmaller E)N2 + hasalongerbondbecauseitsbondorderisgreater 24.WhatisthemolecularorbitalelectronconfigurationforF2 T? A)(σ2s) 2 (σ2s*) 2 (σ2p) 2 (π2p) 4 (π2p*) 4 (σ2p*) 1 B)(σ2s) 2 (σ2s*) 2 (σ2p) 2 (π2p) 4 (π2p*) 3 C)(σ2s) 2 (σ2s*) 2 (σ2p) 2 (π2p) 4 (π2p*) 4 D)(σ2s) 2 (σ2s*) 2 (π2p) 4 (σ2p) 2 (π2p*) 4 (σ2p*) 1 E)(σ2s) 2 (σ2s*) 2 (π2p) 4 (σ2p) 2 (π2p*) 3 Page 7

CHEM1211KSpring2011 GeorgiaInstituteofTechnology 25.Thevolumeofasampleofidealgasis24.8mLat1.12atm.Ifthepressureofthe sampleisincreased,atconstanttemperature,to2.

8 CHEM1211KSpring2011 GeorgiaInstituteofTechnology 25.Thevolumeofasampleofidealgasis24.8mLat1.12atm.Ifthepressureofthe sampleisincreased,atconstanttemperature,to2.64atm,thenwhatisthenew volumeofthesampleinliters? A)10.5L B)0.119L C)0.0566L D)0.0105L E) L 26.Ifittakes1.25minfor0.010molofHetoeffuse,howlongwillittakeforthe sameamountofc2h6toeffuseunderthesameconditions? A)3.43min B)2.19min C)0.456min D)2.74min E)0.0228min 27.Whatmassofpotassiumchlorideformswhen5.25Lofchlorinegasat0.950 atmand293kreactswith17.0gofpotassium? A)30.9gKCl B)32.4gKCl C)681gKCl D)15.4gKCl E)341gKCl 28.Howmanyatomsareinoneunitcellofthestructurebelow? A)1 B)2 C)3 D)4 E)9 Page 8

9 CHEM1211KSpring2011 GeorgiaInstituteofTechnology 29.Whichsubstancewouldyouexpecttohavethelowestboilingpoint? A)CH4 B)SiH4 C)CH3Cl D)SiH2Cl2 E)CH3F 30.IfaunitcellofanioniccompoundhasAcationsatthecornersandtheface centersandxanionsinthecentersoftheunitcellsoftheedges,whatisthe empiricalformulaofthecompound? A)A4X3 B)A6X3 C)A4X2 D)A3X4 E)A3X3 31.AnelementcrystallizesinafaceTcenteredcubicunitcellhasadensityof 1.45g/cm 3.Theedgelengthofitsunitcellis4.52x10 T8 cm.whatisthe approximateatomicmassoftheelementing/mol? A)3.35g/mol B)9.87g/mol C)20.2g/mol D)80.7g/mol E)Notenoughinformation! 32.Ifexpandinggasesinacarenginedo451Jofworkonthepistons,andthe systemloses325jtothesurroundingsasheat,calculatethechangeininternal energy(δu)inj. A)+136J B)T776J C)T96J D)T126J E)+802J Page 9

10 CHEM1211KSpring2011 GeorgiaInstituteofTechnology 33.Alayerofcopperliningaskilletweighs125g.Whatisthespecificheatcapacity ofthecopperif13.3kjheatisneededtoraisethetemperatureofthecopperfrom 25 o Cto300. o C? A)9.40J/g o C B)2.56J/g o C C)0.387J/g o C D) J/g o C E)29.26J/g o C 34.ForwhichspeciesistheenthalpyofformationNOTzero? A)Na(s) B)Cl2(g) C)N2(g) D)H2O(g) E)Noneoftheabove 35.ConsidertwometalsAandB.ThespecificheatcapacityofAhasagreatervalue thanthatofb.whichstatementistrue? A)MoreheatisrequiredtoraisethesamemassofmetalBby1 o Cthan metala. B)Giventhesameamountofheatenergyandthesamemassofbothmetals, thetemperatureofawillrisemorethanthetemperatureofb. C)Ifthesamemassofbothmetals,beginningatthesameinitialtemperature, areeachplacedonatable,thenmetalbwillreachroomtemperature faster. D)Ifthemetals,bothatdifferenttemperatures,areplacedincontactwith eachother,metalawillexhibitagreatertemperaturechangethanmetal B. E)Noneofthesestatementsaretrue. 36.Whatisthechangeinentropyofthesurroundingsforthefollowingprocessat 25 o C? N2(g)+3H2(g) 2NH3(g)ΔH o =T92.6kJ/mol A)+311J/K B)T311J/K C)+3220J/K D)T371J/K E)T27.4J/K Page 10

11 CHEM1211KSpring2011 GeorgiaInstituteofTechnology 37.A100.0mLsampleof0.500MHClwasmixedwith100.0mLof0.500MNaOHin acoffeetcupcalorimeter.theinitialtemperatureofbothsolutionswasroom temperature,22.50 o Candthefinaltemperatureofthemixturewas25.86 o C.Ifno heatislosttothesurroundingsorthecalorimeter,thenwhatistheenthalpyof reaction?thespecificheatcapacityofwateris4.184j/g C.,andthedensityofthe solutionis1.00g/ml. A)T2.81kJ/mol B)+56.2kJ/mol C)+2.81kJ/mol D)T5.62kJ/mol E)T56.2kJ/mol 38.Inthequestionabove,youweretoldtoassumethatnoheatwaslosttothe surroundingsorcalorimeter.whatcanyouassumeaboutthevalueofδhifccal weregreaterthan0? A)ThevalueofΔHisnotaffectedbyanonTzeroCcal. B)ThevalueofΔHbecomeszero. C)TherealabsolutevalueofΔHwouldbegreaterthancalculatedinquestion 36. D)TherealabsolutevalueΔHwouldbelessthancalculatedinquestion36. E)WithoutthevalueofCcal,thereisnotenoughinformation. 39.DeterminethestandardenthalpyofformationforC2H2fromitselementsgiven theinformationbelow. 2C(graphite)+H2(g) C2H2(g) ΔH o =? Given: C(graphite)+O2(g) CO2(g) ΔH o =T383.5kJ/mol H2(g)+½O2(g) H2O(l) ΔH o =T285.8kJ/mol 2C2H2(g)+5O2(g) 4CO2(g)+2H2O(l) ΔH o =T2598.8kJ/mol A)+226.6kJ/mol B)+246.6kJ/mol C)+1930kJ/mol D)T3650kJ/mol E)T1830kJ/mol Page 11

12 CHEM1211KSpring2011 GeorgiaInstituteofTechnology 40.Whichprocessesleadtoanincreaseinentropy?Treatallgasesasideal. I.Thepressureof1moleofoxygengasisallowedtodoubleisothermally. II.Carbondioxideisallowedtoexpandisothermallyto10timesitsoriginal volume. III.Thetemperatureof1molofheliumisincreasedby25 o Catconstant pressure. IV.Nitrogengasiscompressedisothermallytohalfitsoriginalvolume. A)IandIV B)Ionly C)IIIandIV D)IIandIII E)IandII 41.Whichstatementregardingthegraphistrue? " &" $" $" #"!" A)RegionsA,C,andErepresentphasechanges. B)NoheatisexchangedinregionsBandD. C)ΔHvap0ismuchlargerthanΔHfusforthissubstance. D)ThefreezingpointofthesubstanceisT25 o C. E)Noneofthesestatementsaretrue. Page 12

13 CHEM1211KSpring2011 GeorgiaInstituteofTechnology 42.Calculatethemolarheatoffusionforbenzenegiventhefollowingdata: ΔSfus=39.1J/mol K ΔSvap=87.8J/mol K ΔHvap=33.9kJ/mol Normalmeltingpoint=5.5 o C Normalboilingpoint=80.1 o C A)31.0kJ/mol B)7.11kJ/mol C)140.kJ/mol D)10.9kJ/mol E)215kJ/mol 43.Usetheinformationfromquestion42todeterminetheGibbsfreeenergyforthe evaporationofbenzene. A)0kJ/mol! B)2.90kJ/mol C)3.10x10 4 kj/mol D)64.9kJ/mol E)Notenoughinformation 44.ForwhichoftheseprocessesisΔSpositive? I.Ag + (aq)+cl (aq) AgCl(s) II.sublimation III.2O3(g) 3O2(g) IV.condensation A)IandIV B)IIandIII C)IIandIV D)IIonly E)IIIandIV Page 13

14 CHEM1211KSpring2011 GeorgiaInstituteofTechnology 45.Whichstatementbestexplainswhywaterfreezesonlyatorbelow0 o Cat atmosphericpressure. A)Freezingisanendothermicprocesswithanincreaseinentropy. B)Freezingisanexothermicprocesswithdecreaseinentropy. C)ThesignofΔGfortheprocessisalwayspositive. D)Freezingisanendothermicprocesswithadecreaseinentropy. E)Freezingisanexothermicprocesswithanincreaseinentropy. 46.Thedensityofa2.45Maqueoussolutionofmethanol(CH3OH,molarmas= 32.04g/mol)is0.976g/mL.Whatisthemolalityofthesolution? A)2.45m B)0.0314m C)3.18m D)2.51m E)2.73m 47.Byhowmuchdoesthevaporpressurechangewhen218gofglucose(nonT volatilesolute,molarmass=180.2g/mol)isdissolvedin460.0mlofwaterat30 0 C. Atthistemperature,thevaporpressureofpurewateris31.82torr,andthedensity ofwateris1.00g/ml. A)Thevaporpressuredecreasesby1.4torr B)Thevaporpressureincreasesby1.4torr C)Thevaporpressuredecreasesby30.4torr D)Thevaporpressureincreasesby30.04torr E)Thevaporpressuredoesnotchange. 48.Whichstatementistrue? A)CH3OHhasahighervaporpressurethanCH4atagiventemperature. B)Boilingpointstendtodecreasewithincreasingstrengthofintermolecular forces. C)Boilingpointandmeltingpointfollowoppositetrendswithrespectto intermolecularforces. D)Theeasieritisformoleculestoescapetheliquidphasetothegasphase, thegreaterthevaporpressurewillbe. E)H2OhasalowerboilingpointthanCH4. Page 14

15 CHEM1211KSpring2011 GeorgiaInstituteofTechnology 49.MoleculeAhasi=1whilemoleculeBhasi=2.Themolalityofanaqueous solutionofmoleculeaisexactlyhalfthatofmoleculeb.whichstatementistrue? A)ThesolutionofmoleculeBwillresultinahigherfreezingpoint. B)ThesolutionofmoleculeAwillresultinalowervaporpressure. C)TheosmoticpressureofsolutionAisgreaterthanthatofB. D)Thetwosolutionshavethesameboilingpoint. E)Theboilingpoint,freezingpoint,osmoticpressure,andvaporpressure cannotbecalculatedwithoutknowingtheidentitiesofthemolecules. 50.Asolutionispreparedbydissolving35.0gofhemoglobin(Hb)inenoughwater tomake1.00lofsolution.iftheosmoticpressureofthesolutionis0.0132atmat 25 o C,thenwhatisthemolarmassofhemoglobin? A)108g/mol B)65100g/mol C) g/mol D) g/mol E)1.54x10 T5 g/mol 51.Thefreezingpointdepressionofanaqueous0.100msolutionofMgSO4is o C.Whatisthevan'tHofffactor?TheKfforwateris1.86 o C/m. A)1 B)2 C)6 D)1.2 E)Notenoughinformation 52.Foragivensolution,whichofthefollowingconcentrationvalueswillchangeas temperaturechanges? A)masspercent B)molarity C)molefraction D)molality E)noneofthesechoicesiscorrect Page 15

16 CHEM1211KSpring2011 GeorgiaInstituteofTechnology 53.Considerthefollowingreaction: A+B C+D ΔGrxn=T200kJ Basedonthisinformation,whichofthefollowingstatementscanbemadeaboutthe reaction? I.Thereactionisspontaneous. II.Theproductsaremorestablethanthereactants. III.Thereactionisexothermic. IV.Thereactantsarelabile. A) Ionly B) IIIonly C) IandIIonly D) I,II,andIVonly E) I,II,III,andIV Page 16

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CHEM%1310% Sample%Final%Exam% % 5.%What%is%the%formula%of%the%organic%molecule%below?% % % CHEM1310 SampleFinalExam 1.Antimony,Sb,hastwostableisotopes.Giventhat43.8ofnaturalantimonyis 123Sbwiththeexperimentallydeterminedmass122.904amu,whatistheother stableisotope? A) 120 Sb B) 121 Sb C) 122