This question is about electricity and chemical reactions. Bauxite is an ore containing aluminium. Aluminium is extracted by electrolysis of purified bauxite in molten cryolite using carbon electrodes. State two reasons why cryolite is used in this electrolysis. 1 2

Chemistry

IGCSE&ALevel

CAIE

Exam No：0620_s23_qp_41 Year：2023 Question No：5(b)(ii)

Answer:

9.6.1. Describe the ease in obtaining metals from their ores, related to the position of the metal in the reactivity series

9.6.2.1. the burning of carbon (coke) to provide heat and produce carbon dioxide

9.6.2.2. the reduction of carbon dioxide to carbon monoxide

9.6.2.3. the reduction of iron(III) oxide by carbon monoxide

9.6.2.4. the thermal decomposition of calcium carbonate / limestone to produce calcium oxide

9.6.2.5. the formation of slag Symbol equations are not required

9.6.3. State that the main ore of aluminium is bauxite and that aluminium is extracted by electrolysis

9.6.4.1.

9.6.4.2.

9.6.4.3.

9.6.4.4.

9.6.4.5.

9.6.5.1. the role of cryolite

9.6.5.2. why the carbon anodes need to be regularly replaced

9.6.5.3. the reactions at the electrodes, including ionic half-equations

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