Chemistry: Year 10 Term 2: Fuel Cells

What are the two types of hydrogen fuel cell? (2)
Acidic and alkaline
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The anode and cathode are sandwiched around what? (1)
Electrolyte
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H2 is added to which electrode? (1)
Anode (+)
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O2 is added to which electrode? (1)
Cathode (-)
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What is the catalyst? (1)
Platinum
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What does this cause hydrogen to split into? (2)
Protons and electrons
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Where do the electrons go? (1)
Through an external circuit
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Where do the protons go and end up? (3)
Through the electrolyte and a semi-permeable membrane to the cathode
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What happens at the cathode? (2)
O2 is reduced, producing water
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What ions are in the electrolyte for alkaline fuel cells? (1)
OH-
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Why must fuel cells be used together in batteries? (2)
They do not produce enough voltage on their own
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What is acid half equation for anode? (3)
H2 -> 2H + 2e-
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What is acid half equation for cathode? (3)
O2 + 4H+ -> 2H2O
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What is the alkali half equation for anode? (4)
O2 + 2H2O + 4e- -> 4OH-
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What is the alkali half equation for cathode? (3)
H2 + 2OH- -> 2H2O + 2e-
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What is the overall reaction? (2)
Hydrogen + Oxygen -> Water
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What is a regenerative fuel system? (3)
Spare electricity can be used to reverse the reaction, creating O2 and H2 for storage and later use
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Name 3 advantages of fuel cells. (3)
Provides water; Renewable; One-step process uses less energy
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Name 3 disadvantages of fuel cells. (3)
Catalysts poisonous; O2 and H2 production uses energy, uses fossil fuels
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Other cards in this set

Card 2

Front

The anode and cathode are sandwiched around what? (1)

Back

Electrolyte

Card 3

Front

H2 is added to which electrode? (1)

Back

Preview of the front of card 3

Card 4

Front

O2 is added to which electrode? (1)

Back

Preview of the front of card 4

Card 5

Front

What is the catalyst? (1)

Back

Preview of the front of card 5
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