课程名称︰无机化学一 课程性质︰必修 课程教师︰林英智 开课学院：理学院 开课系所︰化学系 考试日期（年月日）︰2013.12.12 考试时限（分钟）：120 是否需发放奖励金：是 （如未明确表示，则不予发放） 试题 : Inorganic Chemistry Mid-Term II 2013.12.12 (10 points each) 1. For the structures of ionic crystal CsCl and NaCl, list the first six terms for calculating the Madelung constant in both cases. The Madelung constants for CsCl and NaCl are 1.76267 and 1.74756, respectively 2. Calculate the packing efficienty of (i) a body center cubic and (ii) a cubic structures. In a cubic structure, if the central "cubic hole" is filled fully with a different atom, calculate (iii) the radius ratio and (iv) the total packing efficiency. 3. The dipole moments of AsCl3 and NH3 are 1.59 and 1.47 D (Debye), respectively and the bond moments of As-Cl and N-H are 1.60 and 1.33 D, respectively. Draw a reasonable structure of AsCl3 and NH3. Give proper equations that determine the bond angle θ of Cl-As-Cl and H-N-H. 4. Briefly describe adnd explain the Trouton's rule. Two compounds MeOH and acetic acid are known to deviate oppositely and significantly from the rule . Explain positive and negative deviations. 5. In the reactions between solid surface and gas or liquid, the parabolic rate law is described as: formation of the thickness of the product layer x is equal to (2kt)^1/2 where k is rate constant and t is time. Derive the rate law and discuss the units of the rate constant in comparison with those for a first-order reaction of solid. Under what condition this law will hold? 6. Draw the unit cell or packing of the following structures: (i) Spinel, MgAl2O4; (ii) Perovskite, CaTiO3; (iii)Zinc blende, ZnS; Wurtzite, ZnS; (iv) ReO3 and (v) CaF2. 7. Metals that have the ccp (cubic closest packing) structure are very malleable (can be rolled or beaten into sheet) and ductile (can be drawn into wire). Why are these characteristics favored for ccp rather than for hcp (hexagonal closest packing). 8. Descruibe the principle of differential scanning calorimetry. What kind of data can you obtain from this technique analytical method? 9. A solid spherical particle is assumed to react only the surface and the rate is determined by the surface area S:rate = kS. The fraction of the reaction complete is denoted by α. Derive the rate equation: 1-(1-α)^1/3 = k"t Find the k" in terms of k. 10. The following graph are IR spectra of MeOH in CCl4 at various concentration, assign the peaks and explain. --

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