33. The normal boiling point of a liquid is defined as: (A) the pressure at which a liquid vaporizes (B) the temperature at which a liquid vaporizes (C) the temperature at which the vapor pressure of a liquid equals 1 atm (D) the temperature at which the vapor pressure of a liquid equals the barometric pressure 34. In the reaction SO2+ 2 H2S ---> 3 S + 2 H2O 35. Which group among the representative (main-group) elements contains the most powerful oxidizing agent?
36. The following standard electrode (reduction) potentials refer to aqueous solution at 25°C. Ni2+(aq) + 2e¯ <===> Ni(s) E° = - 0.25 V Cu2+(aq) + 2e¯ <===> Cu(s) E° = + 0.34 V Fe3+(aq) + e¯ <===> Fe2+(aq) E° = + 0.77 V What is the standard potential for the reaction Cu2+(aq) + Ni(s) <===> Cu(s) + Ni2+(aq) ? 37. Which ion, in solution, can be oxidized by appropriate chemical means but also can be reduced by a different chemical reaction? (A) Fe2+(B) F¯ (C) CO32¯ (D) NO3¯ 38. Choose the pair of salts whose aqueous solutions would form a precipitate upon mixing. 39. Which statement desribing chemical equilibrium is NOT correct? 40. The equilibrium constant for the process Ag2S (s) + H2O (l) <===> 2 Ag+(aq) + S 2 ¯ (aq)
has a very small numerical value. This implies that 41. The rate of a chemical reaction between substances A and B is found to follow the rate equation rate = k[A]2[B] where k is a constant. If the concentration of A is halved, what should be done to the concentration of B to make the reaction go at the same rate as before? (A) The concentration of B should be kept constant. (B) The concentration of B should be doubled. (C) The concentration of B should be halved. (D) The concentration of B should be quadrupled.