15. Initial rate data have been determined at a certain temperature for the gaseous reaction
2NO + 2H₂ → N₂ + 2H₂O
What is the numerical value of the rate constant?
(A)1.5
(B) 9.9
(C) 3.0
(D)0.13
(E) 0.44

16. The reaction A → B + C is known to be zero order in A with a rate constant of 5.0 × 10-2 mol/L • s at 25° C. An experiment was run at 25°C where [A]0 = 1.0 × 10-3 M. What is the integrated rate law? (A)[A] = kt (B) [A]0 - [A]= kt (C) [A] – [A]0 = kt (D)(E)

17. A p-type semiconductor (A)is made by doping host atoms with atoms having more valence electrons than the host. (B) has electrons that lie close in energy to the conduction bands. (C) is made by doping host atoms with atoms having fewer valence electrons than the host (D)two of these (E) none of these

18. A liquid-liquid solution is called an ideal solution ifI. it obeys PV = nRT； II. it obeys Raoult's law.III. solute-solute, solvent-solvent, and solute-solvent interactions are very similar.IV. solute-solute, solvent-solvent, and solute-solvent interactions are quite different. (A)II, IV (B) II, III (C) I, II (D)I, II, III (E) I, II, IV

19. What reason is given for the stability of C□O, N□N, and O□O bonds, compared to the instability of Si□Si, P□P, and S□S bonds? (A)Their metallic character varies greatly. (B) There are large differences in their abilities to form strong pi bonds. (C) There are large differences in their ionization energies. (D)There are large differences in their electronegativities. (E) none of these

20. Which of the following is diamagnetic? (A)F2+ (B) C2+ (C) H2+ (D)N2+ (E) N2+

21. The U-238 nucleus decays to form Pb-206 by α and β decays. Calculate the number of α decays. (A)2 (B)4 (C) 6 (D)8 (E) none of these

22. In lecture, the professor named a molecule 2-ethyl-4-tertiary-butylpentane. An alert student pointed out that although the correct structure could be drawn from this name, the name did not follow systematic rules. What is the correct systematic name for the molecule? (A)3,5,6,6-tetramethylheptane (B) 2-ethyl-4,5,5-trimethylhexane (C) undecane (D)2,2,3,5-tetramethylheptane (E) 2-t-butyl-5-methylhexane

23. Which of the following is optically active (that is, chiral)? (A)3-chloropentane (B) 1-bromopentane (C) 2-chloropentane (D)dichloromethane (E) dimethylamine

24. For a reaction in a voltaic cell, both ΔH° and ΔS° are positive. Which of the following statements is true? (A)E°cell will increase with an increase in temperature. (B) E°cell will decrease with an increase in temperature. (C) E°cell will not change when the temperature increases. (D)ΔG°> 0 for all temperatures. (E) None of the above statements is true.

複選題25. Which of the following coordination compounds will form a precipitate when treated with an aqueous solution of AgNO3? (A)Na3[CrCl6] (B) [Cr(NH3)3Cl3] (C) Na3[Cr(CN)6] (D)[Cr(NH3)6]Cl3 (E) all of these

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