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Electrolysis GapFill
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Electrolysis is a method used to convert ions in into pure . Two rods, called electrodes, are inserted into the , and the ions move to the electrode with the opposite . At the electrodes, the ions are .
When a molten salt is electrolysed, the metal is produced at the and the non-metal is produced at the . This process can be used to extract metals from their ores. One example of this is when aluminium is extracted from a mixture of aluminium oxide and .
Aqueous solutions can also be electrolysed, but OH⁻ and ions are also present due to the water. If the metal is than hydrogen, then is produced at the negative electrode. is produced at the positive electrode, unless the non-metal is a halide, in which case is produced.