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Unformatted text preview: CHM 114B Exam4 SET A Name___________________________________ ASU AfFliate ID No. ___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) On a phase diagram, the critical temperature is __________. A) the temperature at which all three states are in equilibrium B) the temperature below which a gas cannot be liquefed C) the temperature required to cause sublimation oF a solid D) the temperature required to melt a solid E) the temperature above which a gas cannot be liquefed 1) Answer: E 2) What is responsible to the decrease in surFace tension and viscosity with increasing temperature? A) increase in kinetic energy oF molecules B) decrease in kinetic energy oF molecules C) increase in intermolecualr Forces D) decrease in intermolecular Forces E) none oF above 2) Answer: A 3) The decomposition oF N 2 O 5 in solution in carbon tetrachloride proceeds via the reaction 2N 2 O 5 (soln) 4NO 2 (soln) + O 2 (soln) The reaction is frst order and has a rate constant oF 4.82 10- 3 s- 1 at 64C. The rate law For the reaction is rate = __________. A) k [N 2 O 5 ] 2 [NO 2 ] 4 [O 2 ] B) k[N 2 O 5 ] 2 C) k[N 2 O 5 ] D) 2k[N 2 O 5 ] E) k [NO 2 ] 4 [O 2 ] [N 2 O 5 ] 2 3) Answer: C 1 4) A reaction vessel is charged with hydrogen iodide, which partially decomposes to molecular hydrogen and iodine: 2HI (g) H 2 (g) + I 2 (g) When the system comes to equilibrium at 425 C, P HI = 0.708 atm, and P H 2 = P I 2 = 0.0960 atm. The value of K p at this temperature is __________. A) 6.80 10- 2 B) 1.30 10- 2 C) K p cannot be calculated for this gas reaction when the volume of the reaction vessel is not given. D) 1.84 10- 2 E) 54.3 4) Answer: D 5) At 298K, H for the following reaction is- 269.9 kJ/mol, and S is + 11.6 J/K: S (s, rhombic) + O 2 (g) SO 2 (g) It it endotherrmic?...
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- Fall '06