课程名称︰无机化学一 课程性质︰必修 课程教师︰郑淑芬 开课学院：理学院 开课系所︰化学系 考试日期（年月日）︰100/11/30 考试时限（分钟）：160 是否需发放奖励金：是 （如未明确表示，则不予发放） 试题 : 1.Copper metal has a density of 8.92 g/cm3 and its atomic radius is 128 pm (atomic weight of Cu = 63.5). (a) Is Cu in a body-centered cubic or face-centered cubic? (b) How many copper atoms in s unit cell? (c) What is the coordination number of the copper atom? (8%) 2.Many MX2-type compounds have the CaF2 structure, while some have the CdCl2 structure. (a) Explain the difference of these two structures. (b) What characteristics of the compound are necessary for the CdCl2 structure? (c) What usual physical property of CdCl2 results from its struture? (10%) 3. (a) Calculate the enthalpy of formation of KF based on the following data. 0 0 0 Compound ΔH 1st IE 2nd IE ΔH 1st EA 2nd EA ΔH f f lattice (K,g) (K) (K) (F,g) (F) (F) (KF) KF 101 418 3051 80.0 328 -105 567 (all values are in kJ/mol) (b) Knowing r(K2+)~95pm, r(F-)=116pm, estimate the lattice energy of the hypothetical compound KF2 (rutile structure, A=2.408) (c) Calculate the enthalpy of formation of KF2. What factor prevents the formation of KF2? (15%) 4. (a) What are the difference between Frenkel and Schottky defects? (b) Under what circumstances with regard to relative sizes of ions and degree of polarizing character is any of these defects likely to occur? (c) What is "F"-center? (10%) 5.The ReO3 structure is cubic with the Re atom at each corner of the unit cell and one O atom on each unit cell edge midway between the Re atoms. (a) Sketch this unit cell, and also show the projection repesentation. (b) Determine the coordination number of the ions. (c) If another cation M(II) is inserted in the center of each unit cell, what will be the chemical formula of the structure? And, what is the coordination number of M(II)? (d) What will be the oxidation state of Re in this stucture? (10%) 6.Answer the following questions with proper explainations. (a) The solubility trend of Group 2 metal sulfates? (b) The trend of decomposition temperatures of Group 2 metal carbonates? (c) Comparison of the electrical conductivities of graphite, graphite intercalated compounds C8K and C8Br? (15%) 7.Show the "π-molecular orbitals" and its "energy levels" of cyclobutadiene C4H4. (12%) 8.Construct the Walsh Diagram correlating the orbitals of a triangular H3+ ion with those of a linear H3+_ ion, and judge which structure is more stable. (20%) 9. 2- (a) How many vibration modes does a planar PtCl4 ion have? (b) How many Pt-Cl streching peaks do you expect to observe in IR and Raman 2- spectra, respectively, of PtCl4 ion? (c) What are the atomic displacements corresponding to the peaks observed in answer(b)? (20%) ---- formula: Born-Lande eq. Born exponents character table of C3, C4, C4v, D3h, D4h, C(infinite)v, D(infinite)h ---- --

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