課程名稱︰普通化學丙 課程性質︰系內必修 課程教師︰周必泰 開課學院：醫學院/電資學院 開課系所︰醫學系/牙醫學系/電機系 考試日期（年月日）︰2014/12/12 考試時限（分鐘）：50min 試題 : 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:有給一張圖 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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