Aluminium extraction (AQA GCSE Chemistry): Flashcards

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Aluminium extraction
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Ore containing aluminium

Bauxite

Main compound in bauxite

Aluminium oxide

Method to extract aluminium

Electrolysis

Why cryolite is added

Lowers melting point, saves energy

Where aluminium forms in electrolysis

Cathode (negative electrode)

Where oxygen forms in electrolysis

Anode (positive electrode)

Why carbon can't displace aluminium

Aluminium is above carbon in reactivity series

Why carbon anodes need replacing

They react with oxygen to form CO2CO_2

Reaction at carbon anodes

C+O2ightarrowCO2C + O_2 ightarrow CO_2

Key properties of aluminium

Low density (light) and strong when alloyed

Cathode half-equation for aluminium

Al3++3e−ightarrowAlAl^{3+} + 3e^- ightarrow Al

Anode half-equation in aluminium extraction

2O2−ightarrowO2+4e−2O^{2-} ightarrow O_2 + 4e^-

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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

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Reactivity of Metals

Reactions of Acids

Electrolysis

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