Flashcards
Chemistry C3.3 B - Using electrolysis
Cards in this deck (10)
- 1Why is aluminium extracted on a large scale?Due to the enormous demand
- 2What is the main ore of aluminium?bauxite
- 3What does bauxite mainly consist of?aluminium oxide, Al2O3
- 4Why can't aluminium be extracted by heating with carbon?Aluminium is more reactive than carbon
The Al3+ ions in the oxide need a large amount of energy to turn them into aluminium atoms - 5Why is the aluminium ore processed before electrolysis?To remove impurities
- 6What equipment is used to to extract aluminium by electrolysis ?Equipment
Carbon (positive electrode)
Carbon lining of tank (negative electrode)
Insulator
Tapping hole
Substances
Molten aluminium oxide & aluminium - 7What happens at the Negative electrode e while extracting aluminium from bauxite?It is heated until it becomes molten Al2O3 (Which contains moving Al3+ & O2-). The Al3+ ions are attracted to the negative electrode (carbon lining) & gain electrons to form aluminium. Due to the heat, the liquid aluminium forms a pool @ the bottom & runs out the tapping hole
- 8What happens at the positive electrode while extracting aluminium from bauxite?O2- ions are attracted to the positive, carbon electrode where they loose electrons to form oxygen gas.
- 9What happens to the oxygen during the aluminium extraction?Oxygen reacts with carbon electrodes to make carbon dioxide
- 10—
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- GCSE Chemistry (C3 Chemicals of the natural environment ) Flashcards on Chemistry C3.3 B - Using electrolysis, created by lily bevan on 11/12/2017.
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- lily bevan · Dec 2017
- Updated
- Dec 12, 2017
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