1. which of the following metals oxidized by calcium ions? a- potassium b- zinc c- iron d- lead 2. the first electrochemical cell was invented by a- michael faraday b- alessandro volta c- james maxwell d- benjamin 3. why cant a lead storage battery be charged indefinitely? a- a direct current must pass through the cells b- the electrodes lose lead sulfate c- it is difficult to reverse the direction of current flow d- the electrolyte is too expensive 4. which electrode (anode or cathode) is designated as positive in an electrolytic cell? a- anode b- cathode c- both d- neither 5. what is the direction of electron flow in an electrolytic cell? a- from cathode to anode b- from anode to cathode c- in either direction d- there is no flow 6. what electrolyte can be used to electrolyze water? a-