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Electrochemistry USING an electric current to produce chemical changes is called electrolysis. It is often used to purify metals and other substances. An electric circuit is set up using two electrodes, an electrolyte (a liquid containing ions), and a source of electricity. When the electricity is on, ions in the electrolyte move towards the electrodes. There, they gain or lose electrons, making them - and the electrodes - chemically different. Chemical changes can also produce electricity. A battery consists of an electrolyte between two different metal electrodes. Chemical reactions occur between the electrodes and the ions in the electrolyte, making electrons flow. PURIFYING COPPER If a current is passed through copper sulphate solution, positive copper ions move from the impure copper anode to the cathode, where they are deposited as pure copper metal. Electrolysis Electrolysis involves the input of a direct electric current, via electrodes, to produce chemical change in an electrolyte. Any electrolyte by definition...

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