课程名称︰普通化学乙下 课程性质︰必带 课程教师︰牟中原 开课学院：理学院 开课系所︰化学系 考试日期（年月日）︰99/06/22 考试时限（分钟）：10:20~12:10 是否需发放奖励金：yes （如未明确表示，则不予发放） 试题 : A.Multiple choice(45%) 1.What is the (approximate) ratio of the atomic radius to the nuclear radius? (a)10 (b)10^2 (c) 10^5 (d) 10^10 (e) 10^23 2.Carbon-11 is an unstable isotrope. Which kind of radioactive decay would be expected for this isotrope? (a) beta-ray (b) alpha-ray (c) positron (d) X-ray (e) gama-ray 3.When U-235 nuclide is struck by a neutron, the products are three neutrons, Ba-139 and (a) Br-96 (b) Kr-96 (c) Rb-94 (d) Kr-94 (e) Sr-90 4.Which of the following is not a factor in determining the biological effects of radiation exposure? (a) The energy of radiation (b) The age of the organism that suffers the exposure (c) The penetrating ability of the radiation (d) The chemical properties of the radiaiton source (e) The ionizing ability of the radiation 5.Which of the following coordination compounds will form a precipitate when treated with an aqueous solution of AgNO3? (a) [Cr(NH3)3Cl3] (b) [Cr(NH3)6]Cl3 (c) [Cr(NH3)5Cl]SO4 (d) Na3[Cr(CN)6] (e) Na3[CrCl6] 6.Which of the following is paramagnetic? (a) Zn(H2O)6 2+ (b) Co(NH3)6 3+(strong field) (c) Cu(CN)4 2- (d) Mn(CN)6 3-(srong field) (e) Fe(NH3)6 2+(strong field) 7.What is the largest commercial use of lead? (a) gasoline (b) protective coatings for steel (c) semiconductors (d) paints (e) battries used in automobiles 8.Rank the following compounds according to increasing solubility in water. I. CH3-CH2-CH2-CH3 II. CH3-CH2-O-CH2-CH3 III. CH3-CH3-OH IV. CH3-OH (a) I<III<IV<II (b) I<II<IV<III (c) III<IV<II<I (d) I<II<III<IV (e) IV<II<I<III 9.Given the graph below, what is the boiling point of carbon tetrachloride at standard pressure? (a) 333K (b) 307K (c) 371K (d) 350K (e) 373K The graph is on Zumdahl <Chemical Principles> ch17 10.A solution of two liquids, A and B, shows negative deviation from Raoult's law. What does this mean? (a) The molecules of A interact strongly with other A type molecules. (b) The two liquids have a positive heat of solution. (c) The molecules of A interact weakly, if at all, with B-type molecules. (d) The molecules of A hinder the strong interaction between B-type molecules (e) The molecules of A interact more strongly with B-type molecules than with A or B with B 11.In a fission reactor, which element is used to slow down the speed of neutron? (a) Cd (b) B (c) Ba (d) Fe (e) Pb 12.Which of the followings is not an application for TiO2? (a) filling for paper (b) photocatalyst (c) UV absorber in cosmetics (d) Catalyst in fuel cell (e) white paint 13.In a given period, which group has the element with the smallest ionization energy? (a) group 1A (b) group 2A (c) group 3A (d) group 7A (e) group 8A 14.Which of the following is the most abundant metal on earth? (a) Calcium (b) Iron (c) Copper (d) Aluminum (e) Zinc 15.Which is most toxic to us if swallowed in small quantity(~0.1g)? (a) CdNO3 (b) HgS (c) BaSO4 (d) KCl (e) TiO2 B. Problems 1. Please give a description of at least three main applications of the following elements, either in metallic for or its compound:(15%) (a) Ti (b) V (c) Mn (d) Cu (e) Zn 2. Explain each of the following term(12%) (a) spectrochemical series (b) linkage isomers (c) optical isomers 3. Arrange the energy of the d-orbitals splitting in complexes(8%) (a) MX6(octahedral) (b) MX4(tetrahedral) (c) MX4(square linear) (d) MX2(linear) 4. Methane (CH4) gas flows into a combustion chamber at a rate of 200. L/min at 1.50 atm and ambient temperature. Air is added to the chamber at 1.00 atm and the same temperature, and the gases are ignited.(14%) a. To ensure complete combustion of CH4 to CO2(g) and H2O(g), three times as much oxyen as is necessary is reacted. Assuming air is 21 mole percent O2 and 79 mole percent N2, calculate the flow rate of air necessary to deliver the required amount of oxygen. b. Under the conditions in part a, combustion of methane was not complete as a mixture of CO2(g) and CO(g) was produced. It was determined that 95.0% of the carbon in the exhaust gas was present in the C02. The remainder was present as carbon in the CO. Calculate the composition of the exhaust gas in terms of mole fractions of CO, CO2,O2,N2, and H2O. Assume CH4 is completely reacted and N2 is unreacted. c. Assuming a total pressure of theexhaust gas of 1.00 atm, calculate the partial pressures of the gases in part b. 5. A positron and an electron annihilate each other upon colliding, thereby producing energy: (6%) Assuming that both gama-rays have the same energy, calculate the wavelength of theelectromagnetic radiation produced. --

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