课程名称︰普通化学上 课程性质︰大一共同必修科 课程教师︰郑淑芬 开课学院：工学院 开课系所︰化工系 考试日期（年月日）︰2008/12/5 考试时限（分钟）：1小时&45分钟 是否需发放奖励金：是!!当然罗a___a （如未明确表示，则不予发放） 试题 : Single Choice Questions:(20%, 2 points per question) 1.How many "equivalent" atoms are in a unit cell of body-centered cubic structure? (a)1 (b)2 (c)3 (d)4 (e)5 2.Which of the following is polar? (a)SF6 (b)ICl4(-) (c)SF4 (d)AsF6(-) (e)XeF4 3.The molecules OF2 and O3 both have bent shapes. What are the approximate bond angles in OF2 and O3, respectively? (a)109°and 120° (b)both 109° (c)both 120° (d)both 180° (e)109°and 180° 4."Doping" pure silicon with phosphorus results in a _______ material. (a)ionic conductor (b)n-type semiconductor (c)p-type semiconductor (d)insulator (e)superconductor 5.Which of the following has the highest molar enthalpy of vaporization? (a)Xe (b)LiBr (c)H20 (d)I2 (e)Hg 6.Which of the following substances has the highest boiling point? (a)C2H6 (b)Ar (c)CH2Cl2 (d)HF (e)HCl 7.Which of the following gases would you predict to have the largest value of the van der Waals coefficient b? (a)C2F2Cl2 (b)C2FCl5 (c)C2F4 (d)Cl2 (e)F2 8.Which of the following gases will have you largest root mean square speed at 100℃? (a)water (b)argon (c)methane (d)nitrogen (e)oxygen 9.If the interaction between two species is proportional to 1/r^6, which of the following is likely involved? (a)chloromethane molecules in the gas phase (b)chloromethane molecules in the solid phase (c)Li(+) and H2O (d)Na(+) and H2O (e)ions in an ionic solid 10.Which of the following are diamagnetic? (a)O2(+) (b)O2(-) (c)N2(2+) (d)N2(2-) (e)O2 Descriptive & Calculating Questions 11.Briefly explain the following terms, and give an equation or an example for each of them: (15%) (a)Shottky defect (b)Law of Dulong & Petit (c)First law of thermodynamics (c)Liquid crystal (e)Ionic liquid 12.An oxygen tank kept at 20℃ contains 28.0 moles of oxygen and the gauge reads 31.0 atm. After two weeks, the gauge reads 10.5 atm. How many moles of oxygen were used during the two-week period? (5%) 13.Estimate the molar heat capacity of carbon dioxide gas. In addition to translational and rotational motion, there is vibrational motion. Each vibrational degree of freedom contributes R to the molar heat capacity. The temperature needed for the vibrational modes to be assessable can be appro- ximated by θ=hν(vib)/k, where k is Boltzmann's constant. The vibrational modes have frequencies 1.65 x 10^13 Hz,3.35 x 10^13 Hz,and 4.25 x 10^13 Hz, (a)What's the molar heat capacity (at constant pressure) at 400.K? (b)What's the molar heat capacity (at constant volume) at 1000.K? (c)What's the high-temperature limit of the molar heat capacity at constant volume? 14.A piece of stainless steel (specific heat = 0.652J/g℃) is taken from an oven at 238℃ and immersed in 255mL of water (specific = 1.00cal/g℃) at 24.8℃. The water temperature rises to 53.6℃. Whatis the mass of the piece of steel? (5%) 15.Calculate the heat required to convert 10.0g of propanol, C3H7OH, from a solid at -150℃ into a vapor at 120℃. The normal melting point and boiling point of C3H7OH are -127℃ and 97℃ , respectively. The heat of fusion is 5.18 kJ/mol, and the heat of vaporization is 41.7kJ/mol. The heat capacit- ies of the solid, liquid,and gas states are 142, 170 and 108J/mol-K,respec- tively. 16.Copper metal has a density of 8.92g/cm^3 and its atomic radius is 128pm (Atomic weight of Cu = 63.5) (a)Is Cu in a body-centered cubic or face-centered cubic unit cell? (5%) (b)How many copper atoms in a unit cell? (1%) (c)What's the coordination number of the copper atom? (1%) 17.Flausthalite is a mineral of PbSe. The mineral adopts a NaCl type structu- re. The density of PbSe at 25℃ is 8.27g/cm^3 (Atomic weight Pb=207, Se= 79) (a)Calculate the length of an edge of the PbSe unit cell. (5%) (b)Calculate the distance between Pb(2+) and Se(2-) ions in the structure. (3%) 18.(a)Show the molecular orbital energy level diagram for NO. (b)For NO,NO(+), and NO(-), which of them are paramagnetic? Put them in the order of decreasing the both length,and account for your answers. 19.In both the molecule XeOF2 and the ion XeF3(-), an xenon atom is bonded to three other atoms. Please comment on the geometric shapes of these two species and the hybridization of the central xenon atom in each case. (8%) 20.Estimate the standard enthalpy of the following reactions (12%) (a)standard ebthalpy of formation of N20(NNO). (b)H2CCH2 + H2O -> CH3CH2OH (c)standard enthalpy of formation of HNO2. Table of Bond enthalpies,kJ/mol ============================================================================ Bond bond enthaply | Bond bond enthaply H-H 436 | C-C 348 *O--O 496 | C--C 612 *N---N 944 | N-N 163 C-H 412 | N--N 409 N-H 388 | N-O 210 O-H 463 | N--O 630 C--O 743 | C-O 360 ============================================================================ * --代表双键,---代表三键 21.In 2.00 min, 100ml of He at 0℃ effuses through a small holes. At the same temperature, it takes 6.40 min for the same volume of a mixture of O2 and O3 to effuse through the hole. (a)Calculate the percent composition by volume of the mixture (5%) (b)When the temperature is raised to 20℃, how long does it take for this nuxture gas to diffuse through the hole? (3%) <00:41:23.09> -- ◣◣◣◢◢▃ 干你妈的！ ╮ ╯╰◢ ◢ ╯【奥义．真．洨炮】◥ ◢██◣ ◥◤υ ≡◥◤◤这洨炮威力 ╮◢█████◣ ﹎– ﹎–﹊﹎—﹎ ▌◤ █ —⊙-★▃ 居然破表了.. █□█□███ ◢◣ ◢◣ ▌□︵□◥ ν 皿 ★◥ ╮◥█ 皿 ██◤◥◤ ◥◤ ◥◣ ◢◥◢◣■ ◢ ◣ ︶◢◤ ◣ ╭◥████◤╰﹎—﹎–﹎—﹊ ◥◤▆▅▆ ▼ ◣◥ ◤◢ ▼ ◣ ◢ ╮ ◥ ◥ ╰ ψcafelife 〒 ▏ --

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