课程名称︰普通化学丙 课程性质︰系内必修 课程教师︰周必泰 开课学院：医学院/电资学院 开课系所︰医学系/牙医学系/电机系 考试日期（年月日）︰2014/12/12 考试时限（分钟）：50min 试题 : Quiz2 General Chemistry(12/12, 2014)(60 points) 1.For the van-der Waals equation of the real gas nRT n 2 P =(--------) - a( --- ) obs V - nb V a.Define a and b,(6) b.For the following gases which has the largest value of a,which has the smallest value of b,Explain (4) He , Ar , CH4 , NH3 2.A plot of PV/nRT versus P for several gases (200K) is shown below. Why PV/nRT is > 1 for H2 in any pressure (5). Explain why PV/nRT for CO2 is much more deviated from 1 (i.e. < 1) than that for CH4 (5). At high pressure such as > 800 atm the PV/nRT curve for all above gases cannot be fitted by van-der Waals equation,explain? (5) 3.The concentration (in molecules per million molecules of "air") of some smog components versus time of day is shown below.Please briefly describe the mechanism of the time-dependent appearance and disappearance of NO , NO2 and O3 (10) PS:有给一张图 4.(a) The band gap in aluminum phosphide (AlP) is 2.5 electron-volts (the charge of electron is 1.6 x 10^-19 Coulomb). What wavelength of light is emitted by an AlP diode? (10), (b) Use the band model to explain how conductors and semiconductors differ as to the effect of temperature on electrical conductivity. (5) (c)Using silicon semiconductors as a model, define the n-type semiconductors. (10) --

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