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MAJORFIELDTESTINCHEMISTRYSAMPLEQUESTIONS

Thefollowingquestionsillustratetherangeofthetestintermsoftheabilitiesmeasured,thedisciplinescovered,andthedifficultyofthequestionsposed.Theyshouldnot,however,beconsideredrepresentativeoftheentirescopeofthetestineithercontentordifficulty.Ananswerkeyfollowsthequestions.1. Fluorescenceat303nmisusedtomeasurethe

amountoftyrosineresultingfromhydrolysisofaprotein.Thefluorescenceintensityisfoundtobealinearfunctionoftheconcentration.Iftheintensityfora1.0µg/mLstandardis73andtheintensityfortheunknownis62,theconcentrationoftheunknown,inµg/mL,is

(A) 1.9(B) 1.2(C) 0.85(D) 0.43(E) 0.090

2. Amassspectrometermeasureswhichofthe

followingcharacteristicsofmolecularions?

(A) Mass(B) Charge(C) Energy(D) Weight(E) Mass-to-chargeratio

3. Asolutioncontaining0.20gofacalciumsaltis

passedthroughacolumncontainingthehydrogenformofastrong-acidcation-exchangeresin.Theresultingsolutionisneutralizedwith35.0mLof0.10Msodiumhydroxide.WhatisthenumberofmolesofCa2+pergramofthecalciumsalt?

4. Intheanalysisofamixtureoftwocomponentsbygas-liquidchromatography,whichofthefollowinggivesthebestclueastowhetherornotthecomponentscanbeanalyzedwithanydegreeofaccuracy?

(A) Retentiontimes(B) Columntemperature(C) Columnlength(D) Flowrateofthecarriergas(E) Injection-porttemperature

5. WhatwillbetheapproximatepHofabuffer

preparedbymixing100mLof0.1MNa2HPO4and100mLof0.1MNaH2PO4?(ForH3PO4,pKa1=2.1;pKa2=6.8;pKa3=12.5)

(A) 2.1(B) 4.4(C) 6.8(D) 11.2(E) 12.5

____________________________________________

2OH�(aq)+Cr2O72�(aq)→2CrO4

2�(aq)+H2O(l)

6. Thedichromateanion,Cr2O7

2�,dissociatesalmost

completelyinbasicsolution,asshownabove.If2.92gofK2Cr2O7(molarmass294g)isdissolvedin500mLof1MNaOH,theconcentrationofCrO4

2�inthesolutionisclosestto

(A) 0.001M(B) 0.020M(C) 0.040M(D) 0.050M(E) 0.080M

Measurement PipetX PipetY 1 10.25mL 9.70mL

2 9.65mL 9.69mL

3 10.10mL 9.73mL

4 10.40mL 9.68mL

Mean 10.0mL 9.70mL

StandardDeviation 0.36 0.02

7. Twostudentscalibratedtheir10mLpipetsand

obtainedthedatashownabove.Whichofthefollowingstatementsaboutthesedataistrue?

I. StudentXhasevidenceofasignificant

indeterminate(random)error.II. StudentXcanusethevalueof10.00mLas

thevolumeofpipetXwithoutintroducinganysignificanterror(lessthan4partsperthousand)inananalysis

III. StudentYhasevidenceofasignificantindeterminate(random)error.

IV. StudentYcanusepipetYwithoutcorrection,becausethestandarddeviationissosmall.

V. StudentYcanusethevalueof9.70mLasthevolumeofpipetYwithoutintroducinganysignificanterror(lessthan4partsperthousand)inananalysis.

(A) IVonly(B) Vonly(C) IandIIIonly(D) IandVonly(E) IIandIVonly

8. Ofthefollowingelements,whichhasthelowest

firstionizationenergy?

(A) Au(B) Cu(C) Al(D) Be(E) Li

9. Whichofthefollowingisthemostlikelyreasonthatethanolhasahighernormalboilingpoint(78.5ºC)thandimethylether(−23.6ºC)?

(A) Intheliquidphase,ethanolmoleculescan

formhydrogenbonds.(B) Inthevaporphase,dimethylethermolecules

areattractedtoeachotherbystronghydrogenbonds.

(C) Dimethyletherisamorepolarmoleculethanethanol.

(D) Theintermolecularforcesbetweendimethylethermoleculesarestrongerthanthosebetweenethanolmolecules.

(E) Themolarmassofethanolismuchgreaterthanthemolarmassofdimethylether.

10. Whichofthefollowinghydrogencompoundsis

NOTagasatroomtemperature?

(A) NaH(B) BH3(C) CH4(D) NH3(E) HCl

11. Ti(H2O)6

3+absorbslightat500nm,butTiF63�

absorbslightat590nm.Whichofthefollowingexplainsthisdifferenceinabsorption?

(A) F�isaweakerligandthanH2O,resultingina

smallercrystalfieldsplitting.(B) F�isspherical,whileH2Oisbent.(C) Coordinationcomplexcationsabsorbatlower

wavelengthsthananions.(D) Tichangesoxidationstate.(E) Oxygenismoreelectronegativethanfluorine.

12. ThecorrectnameforK3[CoCl2(CN)4]is

(A) potassiumdichlorotetracyanocobalt(II)(B) potassiumdichlorotetracyanocobaltate(II)(C) potassiumdichlorotetracyanocobaltate(III)(D) tripotassiumdichlorotetracyanocobalt(III)(E) tripotassiumdichlorotetracyanocobaltate(III)

13.WhatisthemoleculargeometryofXeF4?

(A) Tetrahedral

(B) Octahedral(C) Squareplanar(D) Squarepyramidal(E) Trigonalbipyramidal

14. Thehybridizationofthepositively-chargedcarbon

atominthestructureeactionintermediateshownaboveis

(A) sp(B) sp2(C) sp3(D) sp3d(E) sp3d2

15.Whichofthefollowingstatementsaboutthe

reactionshownaboveistrue?

(A) BF3actsasaBrønstedacid.(B) BF3actsasaLewisacid.(C) BF3actsasaBrønstedbase.(D) BF3actsasaLewisbase.(E) BF3actsasbothanacidandabase.

16. Allofthefollowingacidscanbestoredinglass

bottlesEXCEPT

(A) HI(B) HClO4(C) H2SO4(D) HF(E) H3BO3

17. Whichofthefollowingcompoundsfollowsthe18-

electronrule?

(A) Ir(CO)[P(C6H5)3]2Cl(B) V(CO)6(C) Ti(η1-C5H5)2(η

5-C5H5)2(D) Cr(η6-C6H6)2(E) W(CH3)6

18. Thekineticenergyofanelectronejectedfroma

metalsurfacethatisexposedtomonochromaticlightdependsontheallofthefollowingEXCEPT

(A) metalused(B) frequencyofthelightused(C) intensityofthelightused(D) wavelengthofthelightused(E) bindingenergyoftheelectroninthemetal

19. Whatisthetotalnumberofdifferentvaluesthat

themagneticquantumnumber,ml,canhavefortheƒorbitalswithorbitalangularmomentumquantumnumberl=3?

(A) 3(B) 5(C) 7(D) 10(E) 14

20. Inagassampleatroomtemperature,whichof

thefollowingstateswillhavethegreatestnumberofmoleculesoccupyingstatesotherthanthelowestenergystate?

(A) Electronicenergystate(B) Rotationalenergystate(C) Vibrationalenergystate(D) Nuclearspinstate(E) Noneoftheabove,sinceallofthemolecules

willbeinthegroundstateatroomtemperature.

21. Thebalancedequationforthespontaneouscell

reactionandthestandardcellpotential,E°,foranelectrochemicalcellisknownatagiventemperature.Whichofthefollowingthermodynamicfunctionscanbecalculatedforthereactionfromthisinformation?

(A) only(B) only(C) only(D) and only(E) , ,and

N2(g)+3H2(g)!2NH3(g) =–92kJ

22. Theequilibriumshownabovecanbedrivenmost

completelytotherightunderwhichofthefollowingconditions?

(A) Highpressureandlowtemperature(B) Highpressureandhightemperature(C) Lowpressureandlowtemperature(D) Lowpressureandhightemperature(E) Moderatepressurewithaneffectivecatalyst

23. Atsufficientlylowtemperatures,gaseous

ammoniahasamolarvolumethatislessthanthatpredictedbytheidealgaslawatcertainlowpressures,buthasamolarvolumethatisgreaterthanthatpredictedatcertainhighpressures.Whichofthefollowingisareasonableexplanationforthisbehavior?

(A) Attractiveforcespredominateattheselow

pressures,andrepulsiveforcespredominateatthesehighpressures.

(B) Repulsiveforcespredominateattheselowpressures,andattractiveforcespredominateatthesehighpressures.

(C) Repulsiveforcesoperateovergreaterdistancesthanattractiveforces.

(D) Asthepressureonagasincreases,itstemperatureincreases.

(E) Hydrogenbondingisnotafactoratthecriticalpressure.

24. Aplotoflnkversusl/T,wherekistheinitialrateconstantforareactionandTisthetemperatureinKelvin,isshownabove.Theslopeoftheplotisequaltowhichofthefollowing?(Eaistheactivationenergy.)

25. Themostprobablespeed( )ofanidealgasmoleculecanbeapproximated

wheremisthemassofamolecule.Inthegraphabove,thecurvesshowthefractionofidealgasmoleculeshavingagivenspeedforthetemperatures300Kand600K,respectively.Accordingtothisdata,ifacurvewereplottedfor1,200K,itwouldmostlikelypeakatwhichofthefollowingspeeds?

(A) 425m/s(B) 850m/s(C) 1,700m/s(D) 3,400m/s(E) 6,800m/s

26. AnunknowncompoundC10H12O,hasthe60-megahertz1HNMRspectrumshownabove.Whichofthefollowing

couldbetheunknowncompound? (A) (B) (C) (D) (E)

27. Whichofthefollowingistheorganicproductofthereactionshownabove? (A) (B) (C) (D) (E)

28. AtwhichcarbondoalloftheD-aldohexoseshave

thesameconfigurationasD-gulose,shownabove?

(A) Carbon2(B) Carbon3(C) Carbon4(D) Carbon5(E) Carbon6

29. WhichofthefollowingcompoundsdoesNOT

reactwithphenylmagnesiumbromide? (A) (B) (C) (D) (E)30. Carbonmonoxideisextremelydangeroustoliving

organismsbecauseit

(A) isanirreversibleinhibitorofserineproteasessuchasacetylcholineesterase

(B) competesveryeffectivelywithoxygenforbindingtothesixthcoordinationpositionofFe2+inheme

(C) causesoxidativeDNAdamage

(D) isasmallnonpolarmoleculeandthereforeactslikeadetergentandripsopencellmembranes

(E) carbamylatesfreeaminogroupsinavarietyofproteinsandenzymes,thusdisruptingnormalhydrogenbonding

31. Whichofthefollowingsetsofstepsisthebest

waytoaccomplishthetransformationshownabove?

(A) 1.HNO3,H2SO4 2.Fe,HCl 3.HCl (B) 1.Cl2,Fe 2.HNO3,H2SO4 3.Fe,HCl (C) 1.HCl,NaNO2 2.Fe,HCl 3.HNO3,H2SO4 (D) 1.Fe,HCl 2.Cl2,Fe 3.HNO3,H2SO4 (E) 1.FumingH2SO4 2.Cl2,Fe 3.HNO3,H2SO4

32. WhichofthefollowingaminoacidshasitsisoelectricpointatthehighestpH? (A) (B) (C) (D) (E)

33. Thedisaccharideshownabovecontainswhichofthefollowingglycosidiclinkages?

(A) α(1→4)(B) α(1→6)(C) α(2→3)(D) β(1→4)(E) β(1→6)

34. Ofthefollowing,whichliststhealkylbromidesshownaboveinorderofdecreasingreactivitywithsodiumiodide

inacetone?

(A) 1>2>3(B) 1>3>2(C) 2>3>1(D) 3>1>2(E) 3>2>1

35. Whichofthefollowingspeciesismostprobablyformedduringtheacid-catalyzedreactionshownabove? (A) (B) (C) (D) (E)

Answer Key 1. C 19. C 2. E 20. B 3. E 21. A 4. A 22. A 5. C 23. A 6. C 24. B 7. D 25. D 8. E 26. B 9. A 27. E 10. A 28. D 11. A 29. E 12. C 30. B 13. C 31. B 14. B 32. B 15. B 33. A 16. D 34. B 17. D 35. D 18. C

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