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: Transporting [[ore]] produces [[Carbon Dioxide]] which contribute to [[Global Warming]].
: [[Metal Refinery|Metal refineries]] produce [[Carbon Dioxide]] as well as other [[pollution]] including [[Sulphur Dioxide]] and [[Nitrous Oxide]]s which lead to [[Acid Rain]].
==Key Stage 4==
===Meaning===
'''Extraction of Metals''' is the process of removing a [[metal]] from a [[Metal Compound|metal compound]].
===About the Extraction of Metals===
There are 2 methods for '''extracting metals''' from [[Metal Compound|metal compounds]]:
*[[Extracting Metals by Electrolysis|Electrolysis]] - Which can be done for all [[metal]]s, but usually only those more [[reactive]] than [[Carbon]] on the [[Reactivity Series|reactivity series]].
*[[Smelting]] - Which can be done for [[metal]]s less [[reactive]] than [[Carbon]] on the [[Reactivity Series|reactivity series]].
: The method chosen to '''extract a metal''' depends on the [[energy]] needed.
: [[Smelting]] requires very high [[temperature]]s to [[melt]] the [[mineral]]s from the [[ore]].
: [[Extracting Metals by Electrolysis|Electrolysis]] can be done in [[solution]] with water at low [[temperature]]s if the [[mineral]] is [[soluble]] and the [[metal]] does not [[Chemical Reaction|react]] strongly with [[water]]. However for [[insoluble]] [[mineral]]s and [[metal]]s which do [[Chemical Reaction|react]] with [[water]] then high [[temperature]]s are needed to [[melt]] the [[mineral]].