课程名称︰普通化学甲下 课程性质︰必 课程教师︰佘瑞琳 开课学院：理学院 开课系所︰化学系 考试日期（年月日）︰4/20/2011 考试时限（分钟）：130 是否需发放奖励金：yes （如未明确表示，则不予发放） 试题 : R=8.314 J/mole = 0.082 L-atm/mole-K; 1eV=1.602E-19J;h=6.63E-34 J-s I: Multuple choice qusetions (40%, 2 points for each question) 1. Which of the following is a conjugated acid-base pair? A. HCO3-, CO32- B. HClO, ClO- C. CH3NH2,CH3NH- D. H2O, OH- 2. Which of the following is Lweis base? A. H2O B. (C2H5)3B C. (C2H5)3N D. NH4+ 3. Which of the following is the base with smallest Kb? A. 邻氯苯胺(图) B. 对苯甲胺(图) C. CH3CH2CH2NH2 D. NCCH2NH2 4. Indicate which of the following will increase the amountof H2 in an equilibrium mixture in the reaction: 3Fe(s) + 4H2O(g) <==> Fe2O3(s) +4H2(g), delta H =-150 kJ A. Rasing the temperature of the mixture B. Introducing more H2O C. Doubling the volume of the container holding the mixture D. Adding an appropriate catalyst 5. Which of the following solution is aicdic? A. Fe(NO3)3 B. NH4I C. Na3PO4 D. LiClO4 6. Which of the solid os more soluble in an acidic solution than in pure water? A. BaCl2 B. MgCO3 C. CaF2 D. Fe(OH)3 7. Which of the following will raise the pH when added to 1.00L of 0.1M NH3(aq)? A. 0.010 mol NH4Cl B. 0.10 mol HCl C. 1.00L of 0.050M NH3(aq) D.1.00g Ca(OH)2(s) 8. Indicate which of the following aqueous solution are buffer solutions? A. 0.100 M NH4Cl B. 0.100 M NH4Cl- 0.100 M NaCl C. 0.100M NH4Cl- 0.100 M NH3 D. 0.100MHCl - 0.200 M NH3 9. You are asked to prepare a buffer solution with a pH = 2.50. The following solutions, all 0.100 M, are available to you, which solutions would you choose to prepare the buffer? Given that: HCOOH pKa = 3.74, CH3COOH, pKa = 4.74, H3PO4 pKa1=2.15 pKa2= 7.20 pKa3=12.38 A. HCOOH B. CH3COOH C. H3PO4 D. NaCHOO E.NaCH3COO F. NaH2PO4 G. Na2HPO4 H. Na3PO4 10. A qualitative analysis of unknown forms a white precopitate with HCL(aq) The precipitate is treated with hot water, yielding a solution that gives a yellow preci[itate with K2CrO4(aq). There is no change in color when the undissolved portion of the precipitate is treated with NH3(aq). Indicate which cation must be present in the unknown. A. Ag+ B. Pb2+ C. Hg22+ D. Bi3+ 11. For the synthesis of ammonia at 298K, N2(g)+3H2(g) <==> NH3(g), the equilbrium costant Keq = 5.8 E5. What is the value of Keq at 298K for the following reaction: NH3(g) <==>1/2N2(g) + 3/2 H2(g)? A. 1.7 E-6 B. 1.3 E-3 C. 7.6 E-2 D. 5.8 E5 12. Calcium hydrixide, Ca(OH)2, is the cheapest strong base available. Ca(OH)2 is coluble in water only to the extent of 0.16g/ 100ml solution at 25 oC. A. The solubility of Ca(OH)2 on molar basis is 0.022M B. The concentration of OH- in water is 0.22M C. The Ph value of the solution is 1.36 D. The Ph value of the solution is 12.64 13. What is the pH of a solution that is 0.250 M (CH3)3N? (Kb=6.3 E-5) A. 2.40 B. 4.20 C. 9.80 D. 11.60 14. What is the molar solubility of AgBr(s) in 3.0M NH3 solution? Ksp of AgBr = 5.0 E-13, Kf of Ag(NH3)2+ = 1.6 E7 A. 7.1 E-7 B. 8.4 E-3 C. 4.0 E3 D. None of above 15. Indicate which of the following process involves an increase in entropy of system? A. 2NH4NO3(s) => 2N2(g) + 4H2O(g)+ O2(g) B. 2SO2(g)+O2(g) => 2SO2(g) C. 2HgO(s) => Hg(l) +O2 (g) D. N2(g) +3 H2(g) => 2NH3(g) 16. Consider the vaporization of water at 100 oC , with H2O(l) in standard state, but with partial pressure of H2O(g) = 2 atm. Which of the following statements about this vaporization at 100 oC are true? A. Standate delta G = 0 B. delta G = 0 C. Standard delta G >0 D. delta G >0 17. If standard delta G = 0 for a reaction, it must be true that A: K=0 B. K=1 C. standard delta H =0 D. Standard delta S = 0 18. Which of the following nuclides would you expect to be radioactive? A. Po 214 B. C 14 C. I 131 D. Pu 239 19. Which of the following can be done to shorten the half life of the radioactive decay of Strontium-90? A. Freeze it B. Heat it C. React it with phosphate to form an insoluble compound D. None of these 20. What particle is emitted in the nuclear transmutation Al 27 => P 30 A. an Alpha particle B. a Beta particle C. a proton D. a neutron Multiple choices questions end here. -- 十年生死两茫茫，不思量，自难忘，千里孤坟，无处话凄凉。 纵使相逢应不识，尘满面 ，鬓如霜。 夜来幽梦忽还乡，小轩窗，正梳妆，相顾无言，唯有泪千行。 料得年年肠断处 ，明月夜 ，短松冈。 --

※ 发信站: 批踢踢实业坊(ptt.cc) ◆ From: 140.112.218.123