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10 Cards in this Set
- Front
- Back
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Electrolysis
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Chemical effect of electricity on ionic compounds which causes them to break up into simpler substances (usually elements)
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What is formed at the cathode?
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Metals or hydrogen
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What is formed at the anode?
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Non-metals
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Define inert
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Carbon electrodes not changed in the reaction, and all they do is carry current
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Products of molten lead (II) bromide
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Lead & bromine
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Products of copper chloride (aqueous)
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Copper (cathode) & oxygen (anode)
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Define electroplating
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When one metal is coated with another to make it look better, or to prevent corrosion
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Products of electrolysis
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Related to the electrolyte and electrodes used
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Extracting aluminium
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Electrolysis of pure aluminium oxide in molten cryolite
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Electrolysis of brine
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Anode made of titanium, cathode made of steel. Ions present are Na+ & Cl- from salt, and H+ & OH- from water.
At the cathode: Hydrogen is discharged in preference to sodium. At the anode: Chlorine is discharged in preference to oxygen (oxidation) |
