16. Which of the following is incorrectly named?
(A)SO₄²⁻, sulfate ion
(B)Cr₂O₇²⁻, dichromate ion
(C)PO₄³⁻, phosphate ion
(D)ClO⁻, chlorite ion
(E)CN⁻, cyanide ion

17. A fuel-air mixture is placed in a cylinder fitted with a piston. The original volume is 0.320-L. When the mixture is ignited, gases are produced and 805 J of energy is released. To what volume will the gases expand against a constant pressure of 635 mmHg, if all the energy released is converted to work to push the piston? (A)9.19 L (B)6.96 L (C)9.83 L (D)9.51 L (E)1.59 L

18. Which statement is true of a process in which one mole of a gas is expanded from state A to state B? (A)When the gas expands from state A to state B, the surroundings are doing work on the system. (B)The amount of work done in the process must be the same, regardless of the path. (C)It is not possible to have more than one path for a change of state. (D)The final volume of the gas will depend on the path taken. (E)The amount of heat released in the process will depend on the path taken.

19. A sample of N2 gas is contaminated with a gas A of unknown molar mass. The partial pressure of each gas is known to be 200. torr at 25°C. The gases are allowed to effuse through a pinhole, and it is found that gas A escapes at 2 times the rate of N2. The molar mass of gas A is: (A)7.00 g/mol (B)56 g/mol (C)14.01 g/mol (D)112 g/mol (E)none of these

20. Which of the following effects will make PV/nRT less than one for a real gas? (A)The gas molecules are large enough to occupy a substantial amount of space. (B)A large number of molecules have speeds greater than the average speed. (C)The gas molecules have a very low molar mass. (D)The gas molecules attract one another. (E)None of these.

21. A solution contains the ions Ag+, Pb2+, and Ni2+. Dilute solutions of NaCl, Na2SO4, and Na2S are available to separate the positive ions from each other. In order to effect separation, the solutions should be added in which order? (A)Na2SO4, NaCl, Na2S (B)Na2SO4, Na2S, NaCl (C)Na2S, NaCl, Na2SO4 (D)NaCl, Na2S, Na2SO4 (E)NaCl, Na2SO4, Na2S

22. Consider the reaction 3A + B + C → D + E where the rate law is defined as  An experiment is carried out where [B]0 = [C]0 = 1.00 M and [A]0 = 1.00 × 10⁻⁴ M, and [A] = 3.26 × 10⁻⁵ M after 3.00 minutes. What is the half-life for this experiment? (A)111 s (B)87 s (C)60 s (D)17 s (E)none of these

23. At 500.0 K, one mole of gaseous ONCl is placed in a one-liter container. At equilibrium it is 5.5% dissociated according to the equation shown here: 2ONCl ⇌ 2NO + Cl2. Determine the equilibrium constant. (A)9.3 × 10⁻⁵ (B)1.7 × 10⁻³ (C)5.8 × 10⁻² (D)9.5 × 10⁻¹ (E)1.1 × 10⁴

24. Ammonia is prepared industrially by the reaction: N2(g) + 3H2(g) ⇌ 2NH3(g) for the reaction: ΔH° = −92.2 kJ and K (at 25°C) = 4.0 × 10⁸. When the temperature of the reaction is increased to 500°C, which of the following is true? (A)K for the reaction will be larger at 500°C than at 25°C. (B)At equilibrium, more NH3 is present at 500°C than at 25°C. (C)Product formation (at equilibrium) is not favored as the temperature is raised. (D)The reaction of N2 with H2 to form ammonia is endothermic. (E)None of the above is true.

25. The equilibrium constant of a certain reaction was measured at various temperatures to give the plot shown below. What is ΔS° for the reaction in J/mol·K? (A)0.20 (B)3.0 (C)25 (D)−50 (E)−8.3 × 10³

1. 國內政治活動頻繁，很多民眾有焦慮、憂鬱，甚至會有憤怒情緒的狀況。焦慮的英文是？ (**173) (A) Melancholy (B) Anxiety (C) Irritable (D) Exhausted

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