Flashcards

Chemistry C3.3 B - Using electrolysis

lily bevan Chemistry GCSE Inglês 10 flashcards

Flashcards do conjunto (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—

Descrição: GCSE Chemistry (C3 Chemicals of the natural environment ) FlashCards sobre Chemistry C3.3 B - Using electrolysis, criado por lily bevan em 11-12-2017.
Criado por: lily bevan · dez 2017
Atualizado: 12 dez 2017
Visualizações: 6
Avaliação