Electrolysis C3

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What is electrolysis
Using electricity to decompose a compound
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What is the difference between electrolysis of molten and solution
In molten electrolysis you get the two elements from the compound but in solution it depends on the reactivity
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What goes to the cathode
Cations because it is negatively charged
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What goes to the anode
Anions because it is positively charged
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What happens at the cathode
The ions are reduced so the gain electrons to become atoms again
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What happens at the anode
The ions are oxidised so they loose electrons the covalentley bond to form molecules
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What is at each electrode in the electrolysis of impure copper
At the cathode is pure copper and the anode is impure
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What appears under the anode
A pile of sludge made from the impurities of the impure copper
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What can you see happening to the electrodes
The cathode will be getting bigger and the anode smaller
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Why
because the copper ions from the impure will be attracted the the cathode where they are reduced to form copper atoms again
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What solution is the electrolyte
Copper sulphate
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What is electroplating
Using electrolysis to cover an object with a thin layer of metal
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What is at the cathode
The object you want to plate
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What is at the anode
The metal you want to use to cover the object
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Why do we use electroplating
To stop corrosion of some metals and for decoration
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Other cards in this set

Card 2

Front

What is the difference between electrolysis of molten and solution

Back

In molten electrolysis you get the two elements from the compound but in solution it depends on the reactivity

Card 3

Front

What goes to the cathode

Back

Preview of the front of card 3

Card 4

Front

What goes to the anode

Back

Preview of the front of card 4

Card 5

Front

What happens at the cathode

Back

Preview of the front of card 5
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