课程名称︰普通化学甲 课程性质︰必带 课程教师︰林万寅 开课学院：理学院 开课系所︰物理系 考试日期（年月日）︰2009/1/14 考试时限（分钟）：120分钟 是否需发放奖励金：是 （如未明确表示，则不予发放） 试题 : 1. Answer the following questions regarding the properties of Ti(Z=22) 10% (A)Write the ground-state electron configuration for a Ti atom. (B)How many unpaired electrons exist in a ground-state Ti atom ? (C)How many core electrons exist in a Ti atom that have m_l = 0 ? (D)How many core electrons exist in a Ti atom that have l = 1 ? (E)Give the total number of possible combinations for the quantum number of the valence electrons in a Ti 2+ ion. 2. For the IF4 - ion, answer the following questions. 10% (A)Give the total number of valence electrons (including the charge). (B)Write the Lewis structure. (C)Indicate its electron group geometry (D)Draw the geometry of the ion. (E)Assign the formal charges for I and F. 3. Draw the geometries of the following molecules or ions (the positions of lone-pair electrons, if present, should also be given): ClF3, SO3 2- XeF2, SeF4, IF5 - 10% 4. The enthalpy of vaporization of ethanol is 40 kJ/mol at its normal boiling point of 78度C. Answer the following questions. (R = 8.314 J/K‧mol) 10% (A)Calculate △S_system and △S_surroungding for the vaporization of 1.0 mol ethanol at 1.0 atm and 78度C. (B)Estimate △G_vap for the vaporization of 1.0 mol ethanol at 50度C (Assume △H_vap and △S_vap are T-independent). (C)Estimate the vapor pressure (in mmHg) of ethanol at 50度C. 5. A balloon filled with 10 mol of helium is heated from 25度C to 50度C at a constant pressure of 1.0 atm. Find q,w,△E,△H,△S_sys and △S_sur for this process. Is this process spontaneous? Assume helium behaves ideally and the temperature of the surrounding is always 25度C;C_v = 20.8 J/K‧mol for helium. 15% 6. Consider the cell: Cu (300g)|Cu 2+ (0.5M)||Ag + (2.0M)|Ag (150g). Answer the following questions. (E = 0.34 V for Cu 2+ and 0.80 V for Ag +). 20% (A)Write the cell reaction. Find its standard cell potential and equilibrium constant. (B)Find the cell potential when the battery is first connected. (C)Calculate [Cu 2+],[Ag +] and the cell potential after 5.0 A of current has flowed for 6 h. (Assume each half-cell contains 1.0 L of solution;Cu = 63.5 Ag = 108;F = 96485 coulombs) (D)Calculate the mass of each electrode after 6 h. (E)How long can this battery delivers a current of 5.0 A before it goes dead? 7. Answer the following questions 25% (A)The values of △H_f for S(g),F(g), and SF6(g) are +278.8, +79.0, and -1209 kJ/mol, respectively. Estimate the average bond energy of an S-F bond. (B)An electron in a one-dimensional box requires a wavelength of 8080 nm to excite an electron from n=2 to n=3. Calculate the length (in nm) of this box.(m_e = 9.1*10^(-31) kg; c = 3.0*10^8 m/s; h = 6.625*10^(-34) J．s) (C)Indicate three types of exception to the octet rule; give one example for each type of exception. (D)Arrange the following atoms: C, N, O, and F, in order of (a) increasing first ionization energy and (b) increasing size. (E)Why is C_p greater than C_v ? Provide a conceptual rationale. PO文附图 http://www.badongo.com/pic/5069109 http://www.badongo.com/pic/5069110 --

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