课程名称︰分析化学乙下 课程性质︰必修 课程教师︰何国荣 开课学院：生命科学院 开课系所︰生技系 考试日期（年月日）︰2012.04.27 考试时限（分钟）：120分钟 是否需发放奖励金：是，谢谢 （如未明确表示，则不予发放） 试题 : 1. Explain that high resolution mass spectrometry produces lower detection limit than low resolution mass spectrometry.(6%) 2. Describe the reason(s) that professor John B. Fenn was awarded Nobel prize in chemistry.(8%) 3. Describe the working principle of FT-IR.(8%) 4. Explain the effect of kinetic polarization in voltammetry.(6%) 5. Describe the real limitations to Beer's Law.(6%) 6. Draw the curve of potential and current vs. time during a controlled potential electrogravimetry.(6%) 7. Explain the reason of adding unmeasured excess of Ce+4 in the coulometric titration of Fe2+.(5%) 8. Explain the working principle of amperometric titration.(6%) 9. In voltammetry why large amount of supporting electrolyte is added to sample solution?(6%) 10.Explain the advantages of differential pulse polarography in comparison with linear scan direct current polarography.(8%) 11.Draw the current-potential curve of electrolysis and explain the voltage behavior at different currents.(8%) 12.Distinguish between a limiting current and a diffusion current.(5%) 13.The following reaction is reversible and has a half-wave potential of -0.349 V when carried out at a dropping mercury electrode form a solution buffered to pH 2.5.(Assume that the diffusion coefficient for O and R are approximately the same) → O + 4H+ + 4e- R ← Predict the half-wave potential at pH:(a)1.0; (b)3.5; (c)7.0 (9%) 14.List the advantages and disadvantages of the dropping mercury electrode compared with platinum or carbon electrodes.(6%) 15.Describe the differences between the following and list and particualr advantages possessd by one over the other.(12%) (a) Filters and monochromators as wavelength selectors (b) Solid-state photodiodes and phototubes as detectors of electromagnetic radiation (c) Phototubes and photomultiplier tubes --

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