Which of the following is NOT true about redox reactions and electrochemical cells?
The purpose of the wire connecting the anode and cathode in an electrochemical cell is for electrons to flow through.
The porous barrier between the two liquid chambers in an electrochemical cell is present so that a limited number of ions can pass through and is necessary for an electric current to flow through the cell.
The positive and negative signs given to the electrodes represent electric charges on each electrode.
It is not always necessary to have a solid rod of an element being oxidized or reduced present in each chamber of an electrochemical cell. An unreactive substitute such as platinum can be used instead.