课程名称︰普通化学甲下 课程性质︰普通化学 课程教师︰佘瑞琳 开课学院：理学院~生农学院 开课系所︰大气系 农化系 地质系 考试日期（年月日）︰2008/4/15 考试时限（分钟）：110分钟 是否需发放奖励金：是 （如未明确表示，则不予发放） 试题 : gas constant:R=8.314J/mol.K =0.082Latm/mol.K I.multiple Choices Questions (30%) 1.For the reaction,2SO2+O2=2SO3, ΔH=-197kJ,which of the following process will increase the number of moles of SO3 in equilbrium? (a)Raise the tempeature. (b)Add oxygen gas. (c)Increase the presure by adding argon gas at constant volume. (d)Increase the presure by decreasing the volume of the reaction container. 2.Calculate the PH for a 15.0M of NH3 (Kb=1.8e-5) (a)15.0 (b)4.74 (c)1.78 (c)12.20 3.Calculate the PH of 0.010M H2SO4 solution.(Ka1>>1,Ka2=1.2e-2) (a)1.70 (b)1.84 (c)2.00 (d)-2.00 4.Calcute the pH ofa 5.0M H3PO4 solution. (Ka1=7.5e-3, Ka2=6.2e-8, Ka3=4.8e-13) (a)-0.70 (b)0.19 (c)0.72 (d)none of the above 5.The Ka value for HF is 7.2e-4 ,for a 0.10M NaF solution, (a)The conjugate acid of F- is HF (b)The Kb value of F- is 1.4e-11 (c)The pH of the solution is 5.93 (d)The degree of dissociation of NaF is 100% 6.Rank the following bases from weakest to strongest; (a)NO3-<H2O<NH3<C5H5N (b)NO3-<H2O<C5H5N<NH3 (c)H2O<NO3-<NH3<C5H5N (d)NO3-<C5H5N<H2O<NH3 7.Rank the following acids from weakest to strongest (a)FCH2COOH<ClCH2COOH<CH3COOH<CH3CH2COOH (b)CH3CH2COOH<CH3COOH<FCH2COOH<CLCH2COOH (c)CH3CH2COOH<CH3COOH<CLCH2COOH<FCH2COOH (d)CH3CH2COOH<CH3COOH<FCH2COOH<CLCH2COOH 8.A buffered solution contains 0.25M NH3 (Kb=1.8e-5)and 0.40M NH4Cl. Calculate the pH of this solution. (a)4.74 (B)4.54 (C)9.26 (D)9.06 9.Which of the following 1-L solution shows the greater buffer capacity? (a)0.50M benzoic acid and 0.50M sodium benzoate. (b)1.0M benzoic acid and 0.50M sodium benzoate. (c)1.0M benzoic acid and 1.0M sodium benzoate. (d)0.50M benzoic acid and 1.0M sodium benzoate. 10.Calculate the Ksp value for bismuth sulfide(Bi2S3), which has a solubility of 1.0e-15M at 25C (a)1.0e-15 (b)1.0e-30 (c)1.0e-75 (d)1.1e-73 11.Which of the following process shows positive entropy change at 25C ? (a)Sublimation of dry ice (solid CO2) (b)Evaporation of water. (c)2SO2+O2->2S03 (d)Ag+ +Cl- ->AgCl 12.Rusting of iron is spontaneous at 25C.For the reaction 4Fe+3O2->2Fe2O3, which of the following is true? (a)ΔS>0 (b)ΔH<0 (c)ΔG<0 (d)ΔS(universe)<0 13.The Ksp of AgI and PbI2 is 8.3e-17 and 1.4e-8,respectively.A solution contains 2.0e-4M Ag+and 1.5e-3M Pb2+, then NaI is added. (a)AgI will precipitate first. (b)PbI will precipipate first. (c)Both will precipipate at same. (d)None of the above will precipitate. 14.The combustion of acetylene gas,C2H2+5/2O2->2CO2+H2O is used in welding For the reaction,ΔH=-1299.5kJ,ΔG=-1235.1kJ,ΔS=-215.5J/K. What is the maximum amount of useful work that can be accomplished under standard conditions by this system? (a)-1299.5kJ (b)-1235.1kJ (c)-215.5J (d)-64.2kJ (e)none of the above. 15.Trouton's rule provides an approximate value (87J/mol-K) for the molar entropy of vaporization of a nonpolar liquide at its normal boiling point. The enthalpy of vaporization of pentadecane,CH3(CH2)13CH3,is 49.45kj/mol at its normal boiling point.What should its approximate normal boiling point temperature be? (a)0.57C (b)87C (c)295C (d)can not determine. ------------------------------------------------------------------------ 夜深了...该睡了... 剩下的明天补上= = --

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