Name two metals which are produced (or extracted) by using the chemical effect of electric current.
Name two metals which are purified by using the chemical effect of current (or electrolysis).
Name one chemical compound which is produced by using the chemical effect of electric current.
(a) Name three types of substances in which an electric current can produce a chemical effect. (b) State some of the characteristics of chemical changes brought about by the chemical effect of electric current. (c) Why does an electric bulb glow when a current passes through it ?