Electrolysis is like a magic trick that helps us get pure metal from a mixture that contains some dirty bits or other things mixed in. When we use electrolysis for copper, we put two rods in a special liquid — one rod has impure copper (called the anode) and the other has pure copper (called the cathode). When we pass electric current, the copper from the impure rod moves through the liquid and sticks to the pure rod, slowly making it bigger and cleaner.
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