(A) For each half-reaction, indicate whether the reaction occurs at the cathode or the anode. Assume it is a voltaic (galvanic) cell.
(1) Sn -> Sn+2 + 2e-
(2) Cu+2 + 2e- -> Cu
(3) Zn -> Zn+2 + 2e-
(B) Indicate whether the item in the list describes a voltaic cell or a electrolytic cell.
(1) measured potential (voltage) is negative
(2) electrons flow from anode to cathode
(3) reaction is spontaneous
(4) in order to proceed as written, an external electrical current must be supplied
(5) cell potential (Ecell) is positive
3 Responses
A
1. anode
2.cathode
3.anode
remember that in an electrolytic cell reduction takes place at cathode and oxdn at anode
remember it like this
red-cat
an-ox
B.
electrolytic cell
external current supply is reqd for it
(A) (1) and (3) are oxidations. Oxidation always occurs at the anode. (2) is reduction, so at the cathode.
(B)
(1) Electrolytic
(2) Either electrolytic or voltaic
(3) Voltaic
(4) Electrolytic
(5) Voltaic
1 and 3 at anode and 2 at cathode. in an electrochemical cell oxidation reaction always takes place at anode.