※ [本文转录自 NTU-Exam 看板] 作者: Danceaway (瑶小五) 看板: NTU-Exam 标题: [试题] 94上 陈振中 普化乙 时间: Fri Nov 11 19:40:30 2005 课程名称︰普通化学乙 课程性质︰共同必修 课程教师︰陈振中 开课系所︰化学系 考试时间︰2005/11/11 10:30~12:10 试题 : You may or may not find the following equation and physical constants useful. Section A(40 pionts): 1. The best laboratory vacuum system can pump down to as few as 1.0* 10^9 molecules per cubic meter of gas. Calculate the corresponding pressure, in atmospheres, assuming a temperature of 0℃. 2. A 1.148-g sample of benzoic acid is burned in an excess of oxygen in a bomb calorimeter. The temperature of the calorimeter rises from 24.96 to 30.25℃. The heat of combustion of benzoic acid is -26/42kJ/g. In a second experiment, a 1.046-g powdwered coal sample is burned in the same calorimeter assembley. The temperature rises from 24.18 to 29.73p. How many kilograms of this coal would have to be burned to liberate 1.00*10^9 kJ of heat? 3. Consider the reaction R(aq) ←→P(aq). Given that the ΔG° of this reaction is zero. (a)Calculate the Keq constant for the reaction. (b)Sketch the varioation of the free energy(G) as a function of the concentration of R. [Hints:Consider x-axis as the concentration of R, y-axis as the free energy, You must label the positions of G°p, G°r and the equilibrium position.] Section B(60 points): 1. Which of the following is the Zeroth law of thermodynamics? A. Energy can never be created of destroyed but it can be changed from one form to another. B. Two bodies in thermal contact are at thermal equilibrium with each other if the two bodies are at the same absolute temperature. C. Any process carried out in several steps, the overall ΔH is equal to the sym of the enthalpy changes(signed) for the individual steps. D. None of the above. 2. Which of the following is an extensive property? A. Temperature B. Entropy C. Molar heat capacity D. Specific heat capacity. 3. For any spontaneous chemical reactions in a beaker at constant temperature and pressure, which of the following condition must be satisfied? A. ΔSsystem ≧ 0 B. ΔH-TΔSsystem < 0 C. ΔG ≧ 0 D. ΔSuniverse < 0 4. In an exothermic reaction, if we double the amount of reactants, which of the following statements if correct? A. The amount of heat evolved will be double. B. The amount of heat absorbed will be the same. C. The final temperature will be two times higher. D. The amount of heat evolved will be the same. 5. Which of the following has the largest entropy at room temperature? A. One mole of He atoms B. One mole of CO molecules C. One mole of CO2 molecules D. 10g of liquid water 6. Which of the following reaction is NOT favored by the system entropy? A. H2(g) + Br2(g) → 2HBr(g) B. 2H2(g) + O2(g) → 2H2O(g) C. H2O(l) → H2O(g) D. None of the above 7. Consider a mineral salt perovskite MgSiO3. If some fo the Si are substituted by Al, determine the value x for the resultant non-stoichiometrc perovskite compound MgSi0.95Al0.05Ox A. 2.9 B. 2.95 C. 2.975 D.3 8. Which of the following equation is the correct can der Waals equation? A.[P(obs)-a(n/V)^2](V+nb)= nRT B.[P(obs)+a(n/V)^2](V+nb)= nRT C.[P(obs)+a(n/V)^2](V-nb)= nRT D.[P(obs)-a(n/V)](V+nb)= nRT 9. Referring to the following diagram, initilly the pressure and volume of the gas system is P1 and V1, respectively. (图为一Heat recervoir at constant T，内有Ideal gas，活塞外接一定滑轮， 连结一质量为M1的砝码) What is the work done by the gas system when the ass is changed in the following way: M1→M1/2→M1/4→0 A. 0.75P1V1 B. -0.75P1V1 C.-P1V1 D. -1.16P1V1 10. Suppose the volume of an ideal gas system expand reversibly and that there is no energy as heat flows onto or out of the system during the expansion. Which of the following equation gives the correct relation of the initial(P1, V1, T1) and the final(P2, V2, T2)states of the system? A.(T2/T1)^Cv = (V1/V2) B.(P1V1)^R = P2V2 C.P1V1 = P2V2 D.(T2/T1)^Cv = (V1/V2)^R -- 这个小孩好奇怪。 --

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