Chemical Changes 2

reactions where the more reactive metsl displaces the less reactive metal

where the substance being reacted gains electrons

where the substance being reacted loses electrons

a rock containing enough quantities of a mineral for extraction to be possible

the decomposition of a compound using electric currents

potassium, sodium, calcium, magnesium, lithium and aluminium

splits ionic salt compounds into their constituent elements

electrolysis that breaks down a molten ionic compound into their comstituent elements

The ions can freely flow, unlike in a lattice

at the cathode: reduction reaction
at the anode: oxidation reaction

- The ground is open-cast mined and the main ore found is bauxite; from this ore aluminium oxide is taken
- The extracted aluminium oxide is reacted with cryolite to reduce the cost of extraction and reduces the melting point
- In the electrolyte the ions Al3+ and O2- are found, the cathode makes up the tank and the anode make up the electrode
- The aluminium ions sink to the bottom due to their density and are reduced and the oxygen ions react with the anode to produce CO2