CHEM1310 SampleFinalExam 1.Antimony,Sb,hastwostableisotopes.Giventhat43.8ofnaturalantimonyis 123Sbwiththeexperimentallydeterminedmass122.904amu,whatistheother stableisotope? A) 120 Sb B) 121 Sb C) 122 Sb D) 123 Sb E) 124 Sb 2.Whatisthechemicalformulaforthecompoundcontainingtheiron(III)cation andthesulfateanion? A)Fe3SO4 B)FeS C)Fe3(SO4)2 D)Fe2(SO4)3 E)Fe2S3 3.Agivenisotopecontains92protons,146neutrons,and86electrons.Whatisthe chemicalsymbolforthisisotope? A) 238 92U 6+ B) 146 92U C) 178 86Rn D) 238 86Rn 6+ E) 146 U 6+ 4.Alaboratoryanalysisofanunknownsoliddeterminedthefollowingmass percentcomposition: Ca=54.09 H=2.72 O=43.19 Whatistheempiricalformulaforthesolid? A)Ca(OH)2 B)Ca27O22H C)CaOH D)Ca0.337O0.675H0.668 E)Ca4(OH)8
CHEM1310 SampleFinalExam 5.Whatistheformulaoftheorganicmoleculebelow? A)C3H6O3 B)C3H2O3 C)CH2O D)C3H3O6 E)CHO2 6.WhatisthesolidproducedwhenK3PO4reactswithCa(NO3)2? A)KNO3 B)Ca3(PO4)2 C)Ca 2+ D)NO3 \ E)K 7.Howmanymolesofcarbonaretherein650.5gramsofglucose,C6H12O6? A)2.17x10 24 B)3.61 C)0.277 D)21.7 E)1.30x10 25 8.Fiveliters(5.00\L)ofanaqueoussolutionispreparedbycompletedissolutionof 40.00gofFeCl2.Whatisthechlorideion(Cl \ )concentrationofthissolution?the molarmassoffecl2is126.75g/mol. A)0.0631M" B)0.0315M" C)0.0876M" E)0.0438M" E)0.126M"
CHEM1310 SampleFinalExam 9.HowmuchC2H2canbeproducedwhen100.gofH2Oreactswith100.gofCaC2 accordingtothereactionbelow? CaC2(s)+2H2O(l) Ca(OH)2(aq)+C2H2(g) A)72.25g B)40.62g C)144.5g D)31.63g E)112.9g 10.Ifthepercentyieldofthereactionis74.2when24.0gofNaHCO3isheated, thenhowmuchna2co3isformed? Molarmasses:NaHCO3=84.01g/mol;Na2CO3=105.99g/mol;CO2=44.01g/mol; H2O=18.01g/mol A)15.1g B)11.2g C)22.3g D)26.4g E)30.3g 11.WhatisthepartialpressureofCOinacontainerthatholds5.0molesCO(g),3.0 molesofn2(g),and1.0moleofh2(g)andhasatotalpressureof1.05atm? A)0.42atm B)0.53atm C)0.58atm D)0.47atm E)Thereisnotenoughinformationtoanswerthisquestion. 12.Anidealgasdiffersfromarealgasinthatthemoleculesofanidealgas. A)haveanaveragemolecularmass. B)havenokineticenergy. C)haveamolecularweightofzero. D)havenoattractionforoneanother. E)takeupasignificantamountofvolumeincomparisontothevolumeofthe sample.
CHEM1310 SampleFinalExam 13.ThegraphbelowrepresentsthegasesHe,Ar,N2,andCH4allatthesame temperature.whichstatementregardingthisgraphistrue? A)Curve3representsN2. B)Curve1representsN2 C)Curve4representsAr. D)Curve2representsHe. E)Curve3representsCH4. 14.Anewlydiscoveredsubstanceinthegasphasehasdensityof2.39g/Lat25.0 o C and0.941atm.whatisthemolarmassofthesubstance? A)16.1g/mol B)62.1g/mol C)5.21g/mol D)0.0919g/mol E)Thisproblemcannotbesolvedwithoutthevolumeofsample. 15.WhatmassofP4(s)isrequiredtocompletelyconsume25.0LofH2(g)at27.0 o C and0.976atminthepresenceofexcessoxygen?themolarmassofp4is 123.88g/mol.ThemolarmassofH2is2.02g/mol. P4(s)+6H2(g)+8O2(g) 4H3PO4(s) A)0.202g B)20.5g C)1.21g D)123g E)246g
CHEM1310 SampleFinalExam 16.Howmanyunpairedelectronsareinagroundstatevanadium(V)atom? A)0 B)1 C)3 D)4 E)5 17.Whichofthefollowinghasthelargestatomicorionicradius? A)S 2\ B)Cl C)Cl \ D)K + E)S 18.Whichsetofquantumnumberscouldcorrespondtoa4d\orbital? A) B) C) D) n=4,l=4,ml=+3 n=4,l=2,ml=+4 n=4,l=3,ml= 3 n=4,l=2,ml=+1 19.Forahydrogenatom,whichtransitioncorrelatestothelongestwavelengthof lightabsorbed? A)n=1ton=2 B)n=3ton=4 C)n=1ton=3 D)n=2ton=5 E)n=2ton=3 20.A0.500Joulelaserpulsewith780.0nmwavelengthcontainshowmany photons? A)1.96x10 18 photons B)2.55x10 \19 photons C)9.67x10 38 photons D)1.96x10 27 photons E)1.27x10 \19 photons
CHEM1310 SampleFinalExam 21.How many lone pairs of electrons are found on the central atom in the Lewis structure of the compound ICl 3? A) 2 B) 3 C) 4 D) 8 E) 11 22. Thehybridorbitalsusedincarbons2and4,respectively,inthemoleculebelow are: A) sp 3 andsp B) sp 2 andsp C) sp 3 andsp 3 D) sp 2 ands 2 E) spd " andsp 23.Whichbondisthemostpolar? A)C H B)C C C)C S D)C O E)C N 24.Whatistheelectrongrouparrangement(electrongeometry)ofAsF3? A)tetrahedral B)trigonalplanar C)trigonalpyramidal D)bent(V\shapedorangular) E)trigonalbipyramidal
CHEM1310 SampleFinalExam 25.Whichmoleculecanformintermolecularhydrogenbonds(withothermolecules ofitself)? A)NH2CH2COOH B)SiH4 C)CH3COCH3 D)CH2F2 E)CH3Cl 26.Whatisap\typesemi\conductor? A) Onewithexcesselectronsinthevalenceband(valenceelectronrich). B) Onewithexcesselectronsintheconductionband(conductionelectronrich). C) Onewithaless\than\fullvalenceband(valenceelectrondeficient). D) Onewithaless\than\fullconductionband(conductionelectrondeficient). E) Onewithelectronspositivelyintheconductionband(conductionpositiveelectrons). 27.Whichstatementregardingtheimageistrue? A)Itisabodycenteredcubicunitcell,andthereare9atomspercell. B)Itisafacecenteredcubicunitcell,andthereare2atomspercell. C)Itisasimplecubicunitcell,andthereisoneatompercell. D)Itisabodycenteredcubicunitcell,andthereare2atomspercell. E)Itisafacecenteredcubicunitcell,andtherearetwoatomspercell. 28.Ranktheboilingpointsfromhighesttolowestfor: CH3OH,CH3CH3,CH2O A)CH3OH>CH3CH3>CH2O B)CH2O>CH3OH>CH3CH3 C)CH3CH3>CH3OH>CH2O D)CH3OH>CH2O>CH3CH3 E)CH2O>CH3CH3>CH3OH
CHEM1310 SampleFinalExam 29.When some TNT detonates, the volume of gas increases from 10.0 L to 90.0 L at a constant pressure of 1.00 atm. Additionally, 90 kj of energy is released as heat. What is ΔE for this process? ( 1 L atm = 101.325 J) A)\98.1kJ B) 81.9kJ C) 8.1kJ D)+81.9kJ E)+98.1 kj 30.Youholdagramofaluminuminonehandandagramofcopperintheother; eachstartedatthesametemperature.to/fromwhichmetalwillmoreheathave beentransferredwhenbothhavereachedbodytemperature?givencs,cu=0.387 J/g C,dCu=8.93g/cm 3,Cs,Al=0.900J/g C,anddAl=2.70g/cm 3. A)Copper,becauseit sspecificheatcapacityislower B)Copper,becauseit sdensityishigher C)Aluminum,becauseit sspecificheatcapacityishigher D)Aluminum,becauseit sdensityislower E)Copperandaluminumwillreachbodytemperatureatthesametime 31.Whichstatementistrue? A)Inanendothermicreaction,theenergyoftheproductsislessthanthatof thereactants. B)Thereisnotemperaturechangeassociatedwiththeconversionoficeto liquidwater. C)Freezingisanendothermicprocess. D)Thechangeinenthalpyisequaltoqatconstantvolume. E)Noneofthesestatementsistrue. 32.Whichstatementbestexplainswhywaterfreezesonlyatorbelow0 o Cat atmosphericpressure. A)Freezingisanendothermicprocesswithanincreaseinentropy. B)Freezingisanexothermicprocesswithdecreaseinentropy. C)ThesignofΔGfortheprocessisalwayspositive. D)Freezingisanendothermicprocesswithadecreaseinentropy. E)Freezingisanexothermicprocesswithanincreaseinentropy.
CHEM1310 SampleFinalExam 33.Given: 1. NH3(g)+HBr(g) NH4Br(s) H rxn=\188.32kj 2. N2(g)+3H2(g) 2NH3(g) H rxn=\92.22kj 3. N2(g)+4H2(g)+Br2(l) 2NH4Br(s) H rxn=\541.66kj Whichstepsarenecessarytocalculatethe Hrxnforthisreaction: H2(g)+Br2(l) 2HBr(g) I. Reversereaction1. II. Halvereaction3. III. Doublereaction1. IV. Reversereaction2. A. I&IVonly B. II&IIIonly C. I&IIIonly D. I,III,&IVonly E. Allofthesestepsarenecessary. 34. For which reaction or process is the change in entropy greater than zero? A) NH3(g)+HBr(g) NH4Br(s) Β) N2(g)+3H2(g) 2NH3(g) C) N2(g)+4H2(g)+Br2(l) 2NH4Br(s) D)H2O(s) H2O(g) E)Na + (aq)+cl \ (aq) NaCl(s)!! 35.Whichofthestatementsbelowisnotadirectconsequenceofalawof thermodynamics? A)Entropyoftheuniverse(systemplussurroundings)increases. B)Spontaneousreactionsarefast. C)Totalenergyisconserved. D)Theentropyofacrystallinesolidapproacheszeroat0Kelvin. E)Alloftheseareconsequencesofthelawsofthermodynamics.
CHEM1310 SampleFinalExam 36.CalculatethenormalboilingpointofCH3CH2OH,giventhefollowing information: H vap 43.5kJ/mol H fus 4.60kJ/mol H f \278kJ/mol S vap 124J/mol K S fus 31.0J/mol K Molecularweight 46.1g/mol A) 159K B) 2240K C) 1.40e3K D) 351K E) 0.351K 37.CalculateΔG o at45.0 o CforareactionforwhichΔH o =\293kJand ΔS o =\69.5J/K. A)\271000kJ B)\290kJ C)21800kJ D)\271kJ E)2830kJ 38.The rate law for a reaction is: Rate = k[a] 2 [B]. What happens to the rate if both concentrations are doubled? A) No change B) Rate increases by a factor of 4 C) Rate increases by a factor of 2 D) Rate increases by a factor of 8. E) Not enough information 39.The rate law for a particular reaction is Rate = k[a][b]. If the initial concentration of B is increased from 0.1 M to 0.3 M (while the concentration of A is held constant), the initial rate will increase by which of the following factors? A) 2 B) 27 C) 4 D) 6 E) 3
CHEM1310 SampleFinalExam 40. A eneral reaction written as 2A + 2B C + 2D is studied and yields the following data. [A] 0 [B] 0 Initial Δ[C]/Δt 0.100 M 0.100 M 4.00 10 5 mol/l s 0.200 M 0.100 M 4.00 10 5 mol/l s 0.100 M 0.200 M 8.00 10 5 mol/l s What are the proper units for the rate constant for the reaction? A) 1/s B) M/s C) 1/M s D) 1/M 3 s E) 1/M 2 s 41.The rate constant, k, for a chemical reaction is dependent on A) the concentration of the reactant. B) the concentration of the product. C) the temperature. D) enthalpy. E) none of these 42.A1.00atmsampleofH2Sisallowedtodecomposeat1405Kuntilequilibriumis achieved.atequilibrium,thepartialpressureofs2is0.0370atm.whatisthevalueofkfor thisreaction? A)2.36x10 \4 B)2.96x10 \3 C)1.42x10 \3 D)4.24x10 3 E)7.04x10 2 2H2S(g) S2(g)+2H2(g)
CHEM1310 SampleFinalExam 43.Selecttheequilibriumexpressionforthereaction: P4(s)+3KOH(aq)+3H2O(l) PH3(aq)+3KH2PO2(aq) ANS:E 1 A) K = [P 4 ][H 2 O] 3 B) K = [KOH] 3 [PH 3 ][KH 2 PO 2 ] 3 C) K = [PH ][KH PO 3 2 2 ]3 [P 4 ][KOH] 3 [H 2 O] 3 D) K = [PH 3 ][KH 2 PO 2 ]3 [KOH] 3 [H 2 O] 3 E) K = [PH ][KH PO 3 2 2 ]3 [KOH] 3 44. An increase in total pressure (at constant temperature) for the following reaction causes: A(g) + B(g) C(g) + heat A) increase in the number of moles of A B) decrease in the number of moles of A C) no change in the number of moles of A D) an undetermined effect on the number of moles of A 45. Calculate the [H + ] in a 0.020 M solution of HCN, K a = 6.2 10 10. A) 1.0 10 7 M B) 3.5 10 6 M C) 1.6 10 5 M D) 2.5 10 5 M E) none of these!!
CHEM1310 SampleFinalExam 46. ThevalueofKforthereactionN2O4(g) 2NO2(g)atagiventemperatureis0.211. IftheequilibriumpartialpressureofNO2atthesametemperatureis0.0172bar, thenwhatistheequilibriumconcentrationofn2o4? A)0.0815 B)0.00664 C)0.00140 D)6.24 10 5 E)0.0602 47.Thegalvaniccellshownbelowusesthehalf\cellsMg 2+ /MgandZn 2+ /Zn,anda saltbridgecontainingkcl(aq).thevoltmetergivesapositivevoltagereading. Whichstatementcorrectlyidentifiestheanodeandcathodecompartmentsandthe reactionsthatoccurinthem? Mg 2+ (aq)+2e \ Mg(s) E o =\2.37 Zn 2+ (aq)+2e \ Zn(s) E o =\0.76V A)AandErepresentthecathode:Zn 2+ (aq)+2e \ Zn(s) B)BandFrepresentthecathode:Mg 2+ (aq)+2e \ Mg(s) C)AandErepresenttheanode:Mg 2+ (aq)+2e \ Mg(s) D)BandFrepresenttheanode:Zn(s) Zn 2+ (aq)+2e \ E)BandFrepresentthecathode:Zn 2+ (aq)+2e \ Zn(s) 48.WhatistheoxidationstateofNinSn(NO3)4? A)\3 B)+2 C)+3 D)+4 E)+5
CHEM1310 SampleFinalExam 49.Whichreactioncorrespondstothecelldiagram? Pt(s) H2(g) H+(aq) Ag+(aq) Ag(s) A)H2(g)+2Ag + (aq) 2H + (aq)+2ag(s) B)2H + (aq)+pt(s)+2ag(s) H2(g)+2Ag + (aq) C)2H + (aq)+ag(s) H2(g)+Ag + (aq) D)Pt(s)+H2(g)+2Ag + (aq) 2H + (aq)+2ag(s) E)H2(g)+Ag + (aq) 2H + (aq)+ag(s) 50.Whatisthestandardcellpotential(E o cell)whenagalvaniccellisconstructed usingthefollowinghalf\reactions? Au 3+ +3e \ Au(s) E o =+1.50V Cu + +e \ Cu(s) E o =+0.52V A)+0.52V B)+0.98V C)+2.02V D)\0.98V E)\2.02V