Electrolysis (OCR GCSE Chemistry A (Gateway Science Suite)): Flashcards

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Using Electrolysis to Extract Metals
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Metal extraction method for very reactive metals

Electrolysis

Metal extracted from bauxite by electrolysis

Aluminium

Primary ore of aluminium

Bauxite

Chemical formula of bauxite

Al2O3Al_2O_3 (aluminium oxide)

Substance added to bauxite to lower melting point

Cryolite

Type of electrodes in aluminium extraction

Graphite electrodes

Ions attracted to cathode in Al extraction

Aluminium ions (Al3+Al^{3+})

Process at cathode for Al3+Al^{3+} ions

Gain electrons (reduction)

Cathode equation for aluminium

Al3++3e−→Al(l)Al^{3+} + 3e^- \rightarrow Al(l)

What happens to molten aluminium in the cell

Sinks to bottom (denser than mixture)

Ions attracted to anode in Al extraction

Oxide ions (O2−O^{2-})

Process at anode for O2−O^{2-} ions

Lose electrons (oxidation)

Gases produced at the anode

Oxygen gas and carbon dioxide

Why carbon dioxide forms at anode

Oxide ions react with carbon in graphite anode

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Reactivity of Metals

Reactions of Acids

Electrolysis

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Reactivity of Metals

Reactions of Acids

Electrolysis

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Reactivity of Metals

Reactions of Acids

Electrolysis

Explore OCR GCSE Chemistry A (Gateway Science Suite) Exam Questions by Topics

Reactivity of Metals

Reactions of Acids

Electrolysis

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