双语物理化学2期中试卷2003级

厦门大双语物理化学（二》课程期中试 化学 2003年 化学专 A一、选择题(1020题2分反应ABCABCrHm0，A，C是自由基，AB，AB，BC 0.055 0.055AB+ 0.055 0.055BC-A2B2C，ABpApB并无C，若p为体系的总压力，当时间为t时，A的分压为 pA-p-p-2(p-pA)-某反应AB3/45 A过渡态理论的速率常数的公kkBThqqA

expE0/RT，下述说法正确的 q不是过渡态的全配分函qAqBqA kBT/h是过渡态M中任一个振动自由度配分函HIHI+hH+IH+HIH2+I+I+MI2+ 124 rSrH [Z]0.0050mol·dm-3所需的时间0.10mol·dm- 0.10mol·dm- 0.20mol·dm- 0.10mol·dm- 0.20mol·dm- 0.05mol·dm- 对于反应X+2Y→3Z，[Z]增加的初始速率为 XYX一级，对YXYX四级，对Y

2CO(g)+

的速率方程是：r=k O2CO (A)Ea=Ec+2RT=Eb+2 (B)Ea=Eb+2 (C)Ea=Ec-2RT=Eb-2 (D) 二、填空题(共48题2分对于平行反应,K值之比,。 。333K时，在水溶液中N(CH2

N(CH3)3Im反应熵变rSm=-155.2J·K-1·mol-1，而活化熵变为S$=-151.2J·K-1·mol-1m 2H2O2(aq)2H2０(l)＋O2(g)I-Ea(cat)＝56.5kJ·mol-Ea(uncat)=75.3kJ·mol-1，则k(I- 。(T=298三、计算题(共5题4710pH3.42CO-血红朊的酸变性是甲酸钠浓度的函数，该一级NaOOCH／mol·dm-10AchemistcamontopofMtKosciusko(heightabovesealevel,2213m)attemptstohardboilaneggforlunch.Howlongwillittaketoproducea“tenminute”egg?Theactivationenergyforthethermaldenaturationoftheimpureovalbuminwhichconstitutestheeggwhiteisapproximay85kJmol-1.Thepressures,P,Poattwopointsinacolumnofgasseparatedbyaheightofharerelatedbytheequationlg(P/Po)=-Mgh/2.303whereMistheaveragemolecularweightofthegasinkgmol-1andgistheaccelerationduetogravity.Youmayassumethattheairtemperaturefromsealeveluptothesummitisconstantat20℃.10Radongasisformedbythedecayofradiumforwhichthehalflifeis1620years.Radonitselfisveryradioactive(halflife=3.82days)andifinhaledcancausecancerofthelungs.Iftheumpermissibleconcentrationofradonintheairis7×10-11ppm(partspermillion)byvolume,howlongmustasealedroomcontaminatedwith20×10-11ppmofradonbeleftbeforetheradonlevelfallstoasafevalue? Calculatehowlongitwilltakefor10-6kgofradiumtocreateahazardinasealedroomof30m3volumeat20℃.(Hint:thistimeissmallcomparedwiththelifeof7Supposethatanenzymehasaturnovernumberof104min-1andamolarmassof60000g·mol-1.HowmanymolesofsubstratecanbeturnedoverperhourpergramofenzymeifthesubstrateconcentrationistwicetheMichaelisconstant?Itisassumedthatthesubstrateconcentrationismaintainedconstantbyaprecedingenzymaticreationandthatproductsdonotaccumulateandinhibitthereation.10AphotochemicalreactionofbiologicalimportanceistheproductionofvitaminD,whichpreventsrickets(软骨病)andbringsaboutthenormaldepositionofcalciumingrowingbones.Steen-bockfoundthatricketscouldbepreventedbysubjectingthefoodaswellasthepatienttoultravioletlightbelow310nm.Whenergosterol麦角甾醇)isirradiatedwithultravioletlightbelow310nm.Vitaminisproduced.WhenirradiatedergosterolwasincludedinadietotherwisedevoidofvitaminD,itwasfoundthatabsorbedradiantenergyofabout7.5×10-5JwasnecessarytopreventricketsinaratwhenfedoveraPeriodof2weeks.TheLightusedhasawavelengthof265nm.(a)Howmanyquantaarenecessarytogive7.5×10-5J?（b）Ifvitaminhasamolarmassofthesameorderofmagnitudeasergosteral(382gmol-1howmanygramsofvitaminDperdayarenecessarytopreventricketsinarat?Itisassumedthatthequantumyieldisunity.四问答题（2题25分1512

O2(g)pOrkp pO2rr

PP

与 r r2

θ、2pθ时， 的值分别为0.79、0.20、0.05（单位为S-1）求m、n根据所得速率方程推测可能的反应机理，讨论在催化剂表面CO(g)和O2(