Using electrolysis to extract metals (5.4.3.3) | AQA GCSE Combined Science: Trilogy (8464) — Chemistry — Higher | KnowledgeSet

Using electrolysis to extract metals

Chemistry (Combined Science) · GCSE · AQA · AQA GCSE Combined Science: Trilogy (8464) — Chemistry — Higher · Specification point · 5.4.3.3 · Chemical changes · Electrolysis

Aluminium extraction by electrolysis

Electrolytic extraction of reactive metals

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Learning Objectives

5.4.3.3 Using electrolysis to extract metals

Content	Key opportunities for skills development
$Metals can be extracted from molten compounds using electrolysis. Electrolysis is used if the metal is too reactive to be extracted by reduction with carbon or if the metal reacts with carbon. Large amounts of energy are used in the extraction process to melt the compounds and to produce the electrical current. Aluminium is manufactured by the electrolysis of a molten mixture of aluminium oxide and cryolite using carbon as the positive electrode (anode). Students should be able to: explain why a mixture is used as the electrolyte explain why the positive electrode must be continually replaced.$

Content

Key opportunities for skills development

Metals can be extracted from molten compounds using electrolysis. Electrolysis is used if the metal is too reactive to be extracted by reduction with carbon or if the metal reacts with carbon. Large amounts of energy are used in the extraction process to melt the compounds and to produce the electrical current. Aluminium is manufactured by the electrolysis of a molten mixture of aluminium oxide and cryolite using carbon as the positive electrode (anode). Students should be able to: explain why a mixture is used as the electrolyte explain why the positive electrode must be continually replaced.