Write the anode reaction, the cathode reaction and the net cell reaction for the following cells. Which electrode will be the positive terminal in each cell?

1.   For the cell
    
Positive terminal:   The bromine electrode where reduction takes place.

2. For the cell 
The two half reactions can be represented as:
(i) Anode reaction (oxidation half reaction):
                
(ii) Cathode reaction (reduction half reaction):
               

Positive terminal. The iodine electrode where reduction takes place.

3. For cell 
the two half reactions can be represented as:
(i) Anode reaction (oxidation half reaction):
                     
(ii) Cathode reaction (reduction half reaction):
                   
Net cell reaction:  It is obtained by adding equations (i) and (ii).

Positive terminal: The copper electrode where reduction takes place.