18. In which of the following cases must E be equal to zero?

(A). II only
(B). I and II
(C). III
(D). I only
(E). None of them

10. In which of the following cases can Eº be equal to zero?I. In any cell at equilibrium II. In a concentration cellIII. Eº can never be equal to zero. (A) I only (B) III (C) I and II (D) II only (E) none of these

19. You make a cell with a copper electrode in a solution of copper nitrate and a silver electrode in a solution of silver nitrate. If you could increase the concentration of , which of the following would be true about the cell potential? (A). It would remain constant. (B). This cannot be determined. (C). It would decrease. (D). It would increase. (E). All the statements are false.

20. Which of the following statements is correct? (A). The system does work on the surroundings when an ideal gas expands against a constant external pressure. (B). The internal energy of a system increases when more work is done by the system than heat is flowing into the system. (C). The internal energy of a system decreases when work is done on the system and heat is flowing into the system. (D). All the statements are true. (E). All the statements are false.

21. For the reaction: CO2(g) + 2H2O(g) → CH4(g) + 2O2(g), ΔH° = 803 kJ Which of the following will increase K? (A). decreasing the temperature of system (B). decreasing the number of moles of methane (C). increasing the volume of system (D). increasing the temperature of system (E). none of these

22. From the following list of observations, choose the one that most clearly supports the conclusion that electromagnetic radiation has wave characteristics. (A). diffraction (B). the emission spectrum of hydrogen (C). the scattering of alpha particles by metal foil (D). cathode "rays" (E). the photoelectric effect

複選題23. Which of the following is a reasonable criticism of the Bohr model of the atom? (A) It shows the electrons to exist outside of the nucleus. (B) It does not adequately predict the ionization energy of the first-energy-level electrons for elements other than hydrogen. (C) It makes no attempt to explain why the negative electron does not eventually fall into the positive nucleus. (D) It does not adequately predict the ionization energy of the valence electron(s) for elements other than hydrogen. (E) It does not adequately predict the line spectrum of hydrogen.

24. Consider the following portion of the energy-level diagram for hydrogen: For which of the following transitions does the light emitted have the longest wavelength? (A) n = 2 to n = 1 (B) n = 4 to n = 1 (C) n = 3 to n = 2 (D) n = 4 to n = 2 (E) n = 4 to n = 3

25. The molecule has a square pyramidal shape. Which of the following atoms could be X? (A) O (B) S (C) P (D) Xe (E) At least two of these atoms could be X.

複選題26. Which ion is planar? (A) (B) (C) (D) (E)

複選題27. Which of the following statements is false? (A) The carbon-carbon bond in is shorter than the one in CH3CH3. (B) The carbon-carbon bond in is stronger than the one in CH3CH3. (C) C2 is diamagnetic. (D) C2 is paramagnetic. (E) Two of these statements are false.

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