MAJOR FIELD TEST IN CHEMISTRY SAMPLE QUESTIONSMAJOR FIELD TEST IN CHEMISTRY SAMPLE QUESTIONS The...
Transcript of MAJOR FIELD TEST IN CHEMISTRY SAMPLE QUESTIONSMAJOR FIELD TEST IN CHEMISTRY SAMPLE QUESTIONS The...
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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?
(A)
(B)
(C)
(D)
(E)
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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
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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
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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
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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.)
(A)
(B)
(C)
(D)
(E)
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25. Themostprobablespeed( )ofanidealgasmoleculecanbeapproximated
as
,
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
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26. AnunknowncompoundC10H12O,hasthe60-megahertz1HNMRspectrumshownabove.Whichofthefollowing
couldbetheunknowncompound? (A) (B) (C) (D) (E)
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27. Whichofthefollowingistheorganicproductofthereactionshownabove? (A) (B) (C) (D) (E)
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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
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32. WhichofthefollowingaminoacidshasitsisoelectricpointatthehighestpH? (A) (B) (C) (D) (E)
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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
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35. Whichofthefollowingspeciesismostprobablyformedduringtheacid-catalyzedreactionshownabove? (A) (B) (C) (D) (E)
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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