Could you please answer these questions 39. For a reaction to be spontaneous at
ID: 831234 • Letter: C
Question
Could you please answer these questions
39. For a reaction to be spontaneous at all temperatures, a) AH must be negative and AS must be positive b) AH must be positive and AS must be positive c) AH must be negative and AS must be negative d) AH must be positive and AS must be negative e) AG must be positive For a reaction to proceed spontaneously, the change in free energy must be 40. a) Zero b) Positive c) Negative d) Greater than 1 kJ e) Due to the reaction absorbing energy from its surroundings 41. For a spontaneous voltaic (galvanic) cell, it is always true that: a) oxidation takes place at the cathode. b) Ecea must be negative. c) Its voltage depends on the size of the electrodes. d) No ions are transfered between the solutions in the two halves of the cell. e) Electrons flow from the anode, through the wire, to the cathode. 42. If a reaction done at standard conditions has AHo 20.5 kJ and AS 455 JIK, what is its change in free energy, AG b) +415 kJ c) +5980 kJ d) -35.0 kJ e) -5650 kJ 43. Which of the following is the correct expression for the equilibrium expression for the reaction given below? 2 Ag (s) zn2+ (aq) 2 Ag (aq) Zn (s) a) K [Ag+]Explanation / Answer
39. a
40. c
41. e
42. a
43. c
44.d (only these wont neutralise each other completely and give buffer solution)
45. a
46. c (no. of gaseous molecules increase)