Electrolysis and fuel cells

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  • Created by: GraceLong
  • Created on: 19-06-16 11:57
Where are ions discharged in electrolysis?
The electrolytes
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How does the charge in an electrolyte move?
They are ionic so the move through the molten liquid by the movemement of ions
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What is the half equation at the cathode of sodium chloride?
Na+ + e- --> Na
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Where do positive ions migrate to in electrolysis?
The negative cathode
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What is the half equation at the anode of sodium chloride?
2Cl- --> Cl2 + 2e-
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What is formed at the cathode and anode during the electrolysis of sodium hydroxide?
Anode: oxygen Cathode: hydrogen
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What is formed at the cathode and anode during the electrolysis of scopper sulfate solution?
Anode: oxygen Cathode: copper
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Why, during the electrolysis of sodium hydorxide, is hydrogen made rather than sodium?
Because sodium is higher up the reactivity series, so hydrogen is discharged
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Why are fuel cells used for spacecrafts?
The water produced can be used for drinking; they are lightweight; they are compact; there are no moving parts
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Why is the car industry develping fuel cells?
There are no carbon dioixde emissions if used in cars; fossil fuels are non-renewable so alternatives are needed; main product is water which is not a pollutant; large source of hydrogen avaliable
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What are the advantages of hydrogen-oxygen fuel cells?
Direct energy transfer; fewer production stages; more effective because there are fewer stages; less polluting; last longer than rechargable batteries; weigh less than current batteries
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What are the problems with fuel cells?
Poisonous catalysts are used and have to be disposed of; fossil fuels are burnt to produce hydrogen and oxygen needed
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What happens to the chemical energy when hydorgen and oxygen react? And how can it be shown?
Chemical energy is given out and it can be shown on an energy-level diagram
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What is a reaction when electorns are gained and lost called?
Redox reaction
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Other cards in this set

Card 2

Front

How does the charge in an electrolyte move?

Back

They are ionic so the move through the molten liquid by the movemement of ions

Card 3

Front

What is the half equation at the cathode of sodium chloride?

Back

Preview of the front of card 3

Card 4

Front

Where do positive ions migrate to in electrolysis?

Back

Preview of the front of card 4

Card 5

Front

What is the half equation at the anode of sodium chloride?

Back

Preview of the front of card 5
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