59. What is meant by the salinity of seawater?
(A)percent by mass of salt in seawater
(B)mass in grams of dry salts present in 1 kg of seawater
(C) molality of NaCl in seawater
(D)osmotic pressure of seawater

55. ΔS is positive for the reaction ________. (A)2H2 (g) + O2 (g) → 2H2O (g) (B)2NO2 (g) → N2O4 (g) (C) CO2 (g) → CO2 (s)(D)BaF2 (s) → Ba2+ (aq) + 2F- (aq)

複選題56. With thermodynamics, one cannot determine ________. (A)the speed of a reaction (B)the direction of a spontaneous reaction (C) the extent of a reaction (D) the value of the equilibrium constant

57. Photoionization processes (e.g., N2 + hν → N2+ + e-) remove UV of ＜ 150 nm. Which photoreaction is the principal absorber of UV in the 150-200 nm range in the upper atmosphere? (A)N2 + hν → 2N (B)O2 + hν → 2º (C) O3 + hν → O2 + O(D)N2 + O2 + hν → 2NO

58. Which one of the following substances found in the atmosphere will absorb radiation in the infrared portion of the spectrum? (A)N2 (B)O2 (C) Kr(D)H2O

60. Which one of the following pairs cannot be mixed together to form a buffer solution? (A)C5H5N, C5H5NHCl (B)HC2H3O2, NaOH (C2H3O2- = acetate) (C) KOH, HI(D)NH2CH3, HCl

61. The Henderson-Hasselbalch equation is ________. (A) (B) (C)(D)

62. Which compound listed below has the greatest molar solubility in water? (A)CdCO3 (B)Cd(OH)2 (C) AgI(D)CaF2

63. In which one of the following solutions is silver chloride the most soluble? (A)0.200 M HCl (B)0.750 M LiNO3 (C) 0.0150 M NH3(D)0.185 M KCl

64. A result of the common-ion effect is ________. (A)that some ions, such as Na+ (aq), frequently appear in solutions but do not participate in solubility equilibria (B)that common ions, such as Na+ (aq), don't affect equilibrium constants (C) that the selective precipitation of a metal ion, such as Ag+, is promoted by the addition of an appropriate counterion (X-) that produces a compound (AgX) with a very low solubility (D)that ions such as K+ and Na+ are common ions, so that their values in equilibrium constant expressions are always 1.00

65. A Br∅nsted-Lowry base is defined as a substance that ________. (A)increases [H+] when placed in H2O (B)decreases [H+] when placed in H2O (C) increases [OH-] when placed in H2O(D)acts as a proton acceptor