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Purdue CHM 11500 - CHM 11500 PARTÉ Week 4 (9/11)

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Page 1 of 4 CHM 11500 PARTÉ Week 4 (9/11) 1. 2. Which one of the following statements is true? When a heavy element undergoes fission, (a) there are fewer nucleons after the reaction than before. (b) there is less mass in the same number of nucleons. (c) there is more mass in the same number of nucleons. (d) there are more nucleons after the reaction than before. 3. Naturally-occurring uranium contains 0.005% 234U, 0.720% 235U and 99.275% 238U. In order to be used as fuel in a fission power plant, the uranium must be enriched to contain about 3% 235U. This is necessary because (a) 238U undergoes fission too easily. (b) the amount of 235U in naturally-occurring uranium is too low to sustain fission. (c) 235U also functions as the moderator. (d) 235U reduces the number of neutrons colliding with the fuel thereby controlling the chain reactions. 4. Identify both the type of nuclear reaction and the missing product in the reaction below. 235U + n → 93Kr + ? + 3 n a. fission, barium-143 b. fusion, barium-143 c. fission, barium-140 d. fusion, barium-140 e. fission, xenon-142Page 2 of 4 5. Identify both the type of nuclear reaction and the missing product in the reaction below. 3He + ? → 4He + 1H a. fusion, hydrogen-2 b. fission, hydrogen-2 c. fusion, helium-2 d. fission, helium-2 e. fusion, helium-3 6. Select the false statement regarding fission and/or fusion reactions. a. Fission is triggered by bombarding large, unstable isotopes with neutrons. b. Nuclear power plants use fusion reactions to produce energy. c. Control rods absorb neutrons and slow down fission reactions in nuclear power plants. 7. What are the coefficients in the following unbalanced chemical equation shown below? (a) 1, 9, 6, 7 (b) 2, 12, 12, 7 (c) 1, 6, 6, 7 (d) 1, 12, 12, 14 (e) 2, 19, 12, 14 8. How many moles of CO2(g) are produced by the combustion of 227 g of butane (C4H10) in excess oxygen? C4H10(l) + O2(g) → CO2(g) + H2O(g) (unbalanced) (a) 0.98 mol (b) 3.91 mol (c) 15.6 mol (d) 19.6 mol (e) 689 molPage 3 of 4 9. What mass of CaCO3 can react with 82.3 g of HClO3 according to the following reaction? CaCO3(s) + 2 HClO3(aq) → Ca(ClO3)2(aq) + H2O(l) + CO2(g) 10. The recharge of a lead storage cell in an automobile battery can be represented by the following equation: 2 PbSO4(s) + 2 H2O(l) → Pb(s) + PbO2(s) + 2 H2SO4(aq) Calculate the mass of elemental lead produced when 49.7 g of lead(II) sulfate reacts. 11.Page 4 of 4 12. 13. When heat is absorbed by the system and work is done by the system on the surroundings then A. q is negative and w is positive. B. both q and w are positive. C. both q and w are negative. p 14. q is positive and w is negative. E. both q and w are zero. 15. What is the change in internal energy of a system that releases 775 J of thermal energy to its surroundings and has 530 J of work done on it? (a) 1.30 kJ (b) ‒1.30 kJ (c) 245 J (d) ‒245 J (e) ‒653 J 16. Complete the sentence: When heat is transferred to the system, the process is said to be ____________, and the sign of q is __________. A. exothermic, positive B. exothermic, negative C. endothermic, positive D. endothermic,


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