The illustration depicts an electrochemical cell.
(A battery connected to a silver metal plate on the left, and an aluminum plate on the right, which are both submersed in a beaker of A g N O 3 solution. Dots and arrows in the water indicate movement from the silver to the aluminum.)
Which kind of work would not be appropriate for this type of cell?
1. powering a light bulb
2. splitting water into hydrogen and oxygen
3. purifying a metal ore
4. electroplating