31. All of the following statements concerning voltaic cells are true EXCEPT
a. a salt bridge allows cations and anions to move between the half-cells.
b. electrons flow from the cathode to the anode in the external circuit.
c. oxidation occurs at the anode.
d. a voltaic cell can be used as a source of energy.
e. a voltaic cell consists of two-half cells.
Answer: _____
32. What is the correct cell notation for a voltaic cell based on the reaction below?
Cu2+(aq) + Fe(s) Cu(s) + Fe2+(aq)
a. Cu(s) | Cu2+(aq) || Fe2+(aq) | Fe(s)
b. Fe(s) || Fe2+(aq), Cu2+(aq) | Cu(s)
c. Cu(s) || Cu2+(aq), Fe2+(aq) || Fe(s)
d. Cu(s) | Fe2+(aq) || Cu2+(aq) | Fe(s)
e. Fe(s) | Fe2+(aq) || Cu2+(aq) | Cu(s)
