The document discusses the process of extracting pure copper from malachite ore. There are two reactions: 1) malachite reacts with heat to form copper oxide and carbon dioxide. 2) Copper oxide then reacts with carbon to form pure copper and more carbon dioxide, as carbon is more reactive than copper. The extracted copper contains traces of other metals and needs to undergo electrolysis to be purified. Electrolysis uses electricity to decompose copper sulphate into pure copper at the cathode and copper ions at the anode. Recycling copper requires less energy and resources than extracting it from ore.