EXERCISE FROM PP.docx

EXERCISE FROM PP.docx

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EXERCISEFROMPP

___84.Thechangefromthesolidphasedirectlytothegaseousphaseiscalled

（1）sublimation;

（2）evaporation;（3）condensation;（4）crystallization.

___85.Asampleofhydrogenhasavolumeof100millilitersatapressureof1atmosphere.

Ifthetemperatureiskeptconstantandthepressureisraisedto2atmospheres,the

volumewillnowbe

（1）25mL;

（2）50mL;（3）100mL;（4）200mL.

___86.Aliquidwhichevaporatesrapidlyatroomtemperaturewouldmostlikelyhavea

high

（1）vaporpressure;

（2）boilingpoint;（3）meltingpoint;（4）attraction

betweenmolecules.

___87.

Exothermicreactionsareusuallyself-sustainingbecause

（1）exothermicreactions

usuallyrequirelowactivationenergies;

（2）exothermicreactionsusuallyrequire

highactivationenergies;（3）theenergyreleasedissufficienttomaintainthereaction;

（4）theproductscontainmorepotentialenergythanthereactants.

___88.Ifthetemperatureofasubstancechanges40Celsiusdegrees,howmanydegrees

woulditstemperaturechangeontheKelvinscale?

（1）40;

（2）233;（3）273;

（4）313.

___89.

Sublimationisachangedirectlyfromthe

（1）solidphasetothegaseousphase;

（2）solidphasetotheliquidphase;（3）liquidphasetothegaseousphase;（4）gaseous

phasetotheliquidphase.

___90.

Atapressureofoneatmospherethetemperatureofamixtureoficeandwaterat

equilibriumwouldbe

（1）25°K;

（2）32°K;（3）273°K;（4）298°K.

___91.

AliterofchlorineatS.T.P.hasamassofapproximately

（1）1;

（2）1.5;（3）3;

（4）.3.

___92.When25gramsofwateriscooledfrom20°Cto10°Cthenumberofcaloriesofheat

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energyreleasedis

（1）10;

（2）25;（3）200;（4）250.

___93.Inaclosedsystemthevaporpressureforwaterishighestatatemperatureof

（1）-40°C;

（2）0°C;（3）20°C;（4）30°C.

___94.

Whichischaracteristicofacompound?

（1）Itcanconsistofasingleelement;

（2）It

ishomogeneous;（3）Itschemicalcompositioncanbevaried;（4）Itcanbedecomposed

byaphysicalchange.

___95.

Whichisaformulaofabinarycompound?

（1）BaSO4;

（2）BiPO4;（3）MgCl2;

（4）Mg（ClO）2.

___96.Whichsubstancecanbedecomposedbyachemicalchange?

（1）ammonia;

（2）argon;

（3）iron;

（4）helium.

___97.

WhichKelvintemperaturesrepresent,respectively,thenormalfreezingpointand

thenormalboilingpointofwater?

（1）0°Kand273°K;

（2）0°Kand100°K;

（3）100°Kand273°K;（4）273°Kand373°K.

___98.

AtSTP,equalvolumesofN2（g）andCO2（g）containequalnumbersof

（1）atoms;

（2）electrons;（3）molecules;（4）protons.

___99.

Thevolumeof50.0millilitersofanidealgasatSTPincreasesto100.milliliters.If

thepressureremainsconstantthenewtemperaturemustbe

（1）0°K;

（2）100°K;

（3）273°K;（4）546°K.

___100.WhichgashasthegreatestdensityatSTP?

（1）oxygen;

（2）helium;（3）krypton;

（4）nitrogen.

___101.Asthetemperatureofaliquidincreasesitsvaporpressure

（1）decreases;

（2）increases;（3）remainsthesame.

___102.Atconstanttemperature,which10mLsample,measuredatSTP,willuniformly

taketheshapeandvolumeofa100mLcontainerintowhichitisplaced?

（1）water;

（2）mercury;（3）sodiumchloride;（4）carbondioxide.

___103.

Whichsamplerepresentsahomogeneousmixture?

（1）C2H5OH（l）;

（2）C2H5OH（aq）;

（3）C2H5OH（g）;（4）C2H5OH（s）.

___104.Whichgasunderhighpressureandlowtemperaturehasabehaviorclosesttothat

ofanidealgas?

（1）H2（g）;

（2）O2（g）;（3）NH3（g）;（4）CO2（g）.

___105.Whatisthevolumeof4.40gramsofCO2atSTP?

（1）2.24L;

（2）4.48L;（3）22.4

L;（4）44.8L.

___106.Underthesameconditionsoftemperatureandpressurewhichofthefollowing

gaseswouldbehavemostlikeanidealgas?

（1）He（g）;

（2）NH3（g）;（3）Cl2（g）;

（4）CO2（g）.

___107.Inanequationwhichsymbolwouldindicateamixture?

（1）NH3（s）;

（2）NH3（l）;

（3）NH3（aq）;（4）NH3（g）.

___108.GiventheequilibriumH2O（s）<======>H2O（l）atapressureof1atmosphere.The

temperatureoftheice-watermixturemustbe

（1）0°C;

（2）32°C;（3）110°C;

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（4）212°C.

___109.Whenthevaporpressureofaliquidinanopencontainerequalstheatmospheric

pressurethentheliquidwill

（1）freeze;

（2）crystallize;（3）melt;（4）boil.

___110.Inaclosedsystem,asthetemperatureofaliquidincreases,thekineticenergyof

itsmolecules

（1）decreases;

（2）increases;（3）remainsthesame.

___111.Asampleofoxygengashasavolumeof150millilitersat300°K.Ifthepressureof

thesampleisheldconstantandthetemperatureisraised600°Kthenewvolumeof

thesamplewillbe

（1）75.0mL;

（2）150.mL;（3）300.mL;（4）600.mL.

___112.AflaskcontainingmoleculesofgasAandaseparateflaskcontainingmoleculesof

gasBarebothatthesametemperature.GasesAandBmusthaveequal

（1）volumes;

（2）masses;（3）pressures;（4）averagekineticenergies.

___113.AsampleofH2（g）andasampleofN2（g）atSTPcontainthesamenumberof

molecules.Eachsamplemusthave

（1）thesamevolume,butadifferentmass;

（2）thesamemass,butadifferentvolume;（3）boththesamevolumeandthesame

mass;（4）neitherthesamevolumenorthesamemass.

___114.Waterwillboilatatemperatureof29°Cifthepressureonthesurfaceofthewater

is

（1）4.6mMofHg;

（2）30.0mMofHg;（3）92.5mMofHg;（4）760.0mMofHg.

___115.Howmanycaloriesofheatenergyarereleasedwhen50gramsofwaterarecooled

from70°Cto60°C?

（1）10calories;

（2）50calories;（3）500calories;（4）1,000

calories.

___116.Whichtemperatureisthesameas-13°C?

（1）260°K;

（2）286°K;（3）747°K;

（4）773°K.

___117.Whichsubstancecannotbedecomposedbyachemicalchange?

（1）mercuric

oxide;

（2）potassiumchlorate;（3）water;（4）copper.

___118.Agasoccupiesavolumeof30mLat273°K.Ifthetemperatureisincreasedto364

°Kwhilethepressureremainsconstantwhatwillbethevolumeofthegas?

（1）60

mL;

（2）40mL;（3）30mL;（4）20mL.

___119.At1atmospherewhichsubstancewillsublimewhenheated?

（1）CO2（s）;

（2）H2O（l）;

（3）CH4（g）;（4）HCl（aq）.

___120.Asagivenvolumeofgasiscompressedthenumberofmolecules

（1）decreases;

（2）increases;（3）remainsthesame.

___121.AsampleofH2O（l）at20°Cisinequilibriumwithitsvaporinasealedcontainer.

Whenthetemperatureincreasesto25°Ctheentropyofthesystemwill

（1）decrease;

（2）increases;（3）remainthesame.

___122.Asa1gramsampleofH2O（l）changestoH2O（g）at100°Cthepotentialenergyof

themolecules

（1）decreases;

（2）increases;（3）remainsthesame.

___123.Asealedflaskcontains1moleofhydrogenand3molesofheliumat20°C.Ifthe

totalpressureis400torrthepartialpressureofhydrogenis

（1）100torr;

（2）200

torr;（3）300torr;（4）400torr.

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___124.Asampleofnitrogencontaining0.25moleshasthesamenumberofmoleculesasa

samplecontaining

（1）1.0moleofH2;

（2）2.0molesofHe;（3）0.25moleofO2;

（4）0.50moleofNe.

___125.Whichtermrepresentsthechangeofasubstancefromthesolidphasetotheliquid

phase?

（1）condensation;

（2）vaporization;（3）evaporation;（4）fusion.

___126.Underwhichconditionsdoesarealgasbehavemostlikeanidealgas?

（1）athigh

temperaturesandlowpressures;

（2）athightemperaturesandhighpressures;

（3）atlowtemperaturesandlowpressures;（4）atlowtemperaturesandhigh

pressures.

___127.Astudentdeterminedthemeltingpointofasubstancetobe55.2degreesCelsius.

Iftheacceptedvalueis50.1degreesCelsiusthenthepercenterrorinherdetermination

is

（1）5.10;

（2）9.24;（3）10.2;（4）12.0.

___128.Usingtherulesforsignificantfiguresthesumof0.027gramand0.0023gram

shouldbeexpressedas

（1）0.029gram;

（2）0.0293gram;（3）0.03gram;（4）0.030

gram.

___129.A1-literflaskcontainstwogasesatatotalpressureof3.0atmospheres.Ifthe

partialpressureofoneofthegasesis0.5atmospherethenthepartialpressureof

theothergasmustbe

（1）1.0atm;

（2）2.5atm;（3）1.5atm;（4）0.50atm.

___130.Whichofthefollowingbestdescribesexothermicchemicalreactions?

（1）They

neverreleaseheat;

（2）Theyalwaysreleaseheat;（3）Theyneveroccurspontaneously;

（4）Theyalwaysoccurspontaneously..

___131.Whatisthetotalnumberofmoleculesin1.0moleofCl2（g）?

（1）35;

（2）70;

（3）6.0x1023;（4）12x1024.

___132.Thenumberofcaloriesneededtoraisethetemperatureof10gramsofwaterfrom

20°Cto30°Cis

（1）10;

（2）20;（3）100;（4）40.

___133.Theheatoffusionforiceis80caloriespergram.Adding80caloriestoonegramof

iceatSTPwillcausetheiceto

（1）increaseintemperature;

（2）decreasein

temperature;（3）changetowateratahighertemperature;（4）changetowaterat

thesametemperature.

___134.Whichofthefollowingsubstancesismostsolubleat60°C?

（1）NH4Cl;

（2）KCl;

（3）NaCl;（4）NH3.

___135.Asthepressureonasampleofgasincreasesatconstanttemperature,thevolume

ofthegas

（1）decreases;

（2）increases;（3）remainsthesame.

___136.Whichistheformulaofabinarycompound?

（1）KOH;

（2）NaClO3;（3）Al2S3;

（4）Bi（NO3）3.

___137.Whichofthefollowingsubstancesismadeupofparticleswiththehighestaverage

kineticenergy?

（1）Fe（s）at35°C;

（2）Br2（l）at20°C;（3）H2O（l）at30°C;

（4）CO2（g）at25°C.

___138.Solidsubstancesaremostlikelytosublimeiftheyhave

（1）highvaporpressures

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andstrongintermolecularattractions;

（2）highvaporpressuresandweak

intermolecularattractions;（3）lowvaporpressuresand