Changes

: '''[[Electrolysis]]''' is usually used to [[Extraction of Metals|'''extract metals''']] when the [[metal]] is more [[Reactivity Series|reactive]] than [[Carbon]] or the [[mineral]] is [[soluble]] in [[water]] making it cheaper to '''extract by electrolysis''' than by [[smelting]].There are two possible methods used to '''extract metals by electrolysis''':*Electrolysis of the Mineral in Solution - Used when the [[mineral]] is [[soluble]] in [[water]] and the [[metal]] does not [[Chemical Reaction|react]] with [[water]].*Electrolysis of the Molten Mineral - Used when the [[mineral]] is [[insoluble]] in [[water]] or the [[metal]] [[Chemical Reaction|reacts]] strongly with [[water]].: [[Aluminium]] is a special case in which the [[mineral]] is not [[dissolve]]d in [[water]] but in a [[solvent]] called [[Cryolite]] at very high [[temperature]]s. This is done because the [[mineral]] [[melt]]s at an even higher [[temperature]] than the [[cryolite]] so it is easier to [[dissolve]] it in the [[cryolite]] than to heat the [[mineral]] beyond its [[Melting Point|melting point]]. ===Electrolysis of Molten Ionic Compounds===Used when the [[mineral]] is [[insoluble]] in [[water]] or the [[metal]] [[Chemical Reaction|reacts]] strongly with [[water]].: The [[electrolysis]] of [[molten]] [[Ionic Compound|ionic compounds]] [[Decompose (Chemistry)|decompose]]s those [[Ionic Compound|ionic compounds]] in a [[liquid]] [[State of Matter|state]].: The [[Ionic Compound|ionic compound]] must be [[heated]] and [[melting|melted]] before [[electrolysis]].: [[Non-metal]] [[ion]]ic [[element]]s or [[compound]]s will be collected at the [[anode]] where they lose their extra [[electron]]s.: [[Metal]] [[ion]]s will be collected at the [[cathode]] where they gain [[electron]]s.  ===Electrolysis of Aqueous Minerals===Used when the [[mineral]] is [[soluble]] in [[water]] and the [[metal]] does not [[Chemical Reaction|react]] with [[water]].: The [[electrolysis]] of [[aqueous]] [[Ionic Compound|ionic compounds]] [[Decompose (Chemistry)|decompose]]s those [[Ionic Compound|ionic compounds]] in [[solution]].: [[Non-metal]] [[ion]]ic [[element]]s or [[compound]]s will be collected at the [[anode]] where they lose their extra [[electron]]s.: [[Metal]] [[ion]]s less [[Reactivity|reactive]] than [[Hydrogen]] will be collected at the [[cathode]] where they gain [[electron]]s.