GCSE Chemistry C3 - Electrolysis

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  • Created by: BethanyM
  • Created on: 15-06-15 20:07
What is electrolysis?
The process which ionic substances are broken down into simpler substances using electricity. Gases or metals may form at the electrodes.
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Is the current supplied in electrolysis direct or alternating?
Direct
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What is the electrolyte?
An ionic substance in the molten state or dissolved in water
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What are the anode and the cathode?
The anode is the positively charged electrode, the cathode is the negatively charged electrode
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Where do positively charged ions (the cations) migrate to in electrolysis?
Positively charged cations migrate to the negatively charged cathode
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Where do negatively charged ions (the anions) migrate to in electrolysis?
Negatively charged anions migrate to the positively charged anode
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Define oxidation
The loss of electrons
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Define reduction
The gain of electrons
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In electrolysis, where does oxidation occur?
At the anode
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In electrolysis, where does reduction occur?
At the cathode
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What are the products of the electrolysis of sodium chloride (l)?
Sodium and chloride
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What is the half equation at the cathode?
Na+ + e- = Na
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What is the half equation at the anode?
2Cl- = Cl2 + 2e-
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What can sodium (Na) be used for?
Street lamps and coolant for nuclear reactors
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What are the products of the electrolysis of sodium chloride (aq)?
Hydrogen, chlorine and sodium chloride (aq)
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What are the products of the electrolysis of lead bromide (l)?
Lead and bromine
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What are the products of the electrolysis of copper sulphate (aq)?
Copper and oxygen
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What are the products of the electrolysis of copper chloride (aq)?
Copper and chlorine
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What are the products of the electrolysis of sodium sulphate (aq)?
Hydrogen and oxygen
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When purifying copper, is the impure copper on the anode or cathode?
The anode (positive electrode)
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When purifying copper, is the pure copper on the anode or cathode?
The cathode (negative electrode)
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What is the electrolyte made of in the purification of copper?
A solution of copper sulphate containing copper ions
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Which electrode gains mass in the process of copper purification?
The cathode
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What is the half equation for the reaction at the anode in the electrolytic purification of copper?
Cu (s) = Cu2+ (aq) + 2e-
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What is the half equation for the reaction at the cathode in the electrolytic purification of copper?
Cu2+ (aq) + 2e- = Cu (s)
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What happens to the impurities when impure copper is purified by electrolysis?
Precious metals such as gold, silver and platinum are recovered from them
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Why is electroplating objects with metal useful?
It prevents corrosion and improves the appearance of objects (it decorates them)
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Card 2

Front

Is the current supplied in electrolysis direct or alternating?

Back

Direct

Card 3

Front

What is the electrolyte?

Back

Preview of the front of card 3

Card 4

Front

What are the anode and the cathode?

Back

Preview of the front of card 4

Card 5

Front

Where do positively charged ions (the cations) migrate to in electrolysis?

Back

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