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GCSE Chemistry Fuel cells

Last updated 9 months ago
13 questions
2

What are the reactants in a hydrogen fuel cell

2
The fuel cell converts energy between _____________ and _______________ forms (note this is a different treatment to the one in Physics where there is a chemical potential store and an electrical transfer)
Other Answer Choices:
electrical
chemical
1
What is the name of the compound that is often used as an electrolyte?
_______
1
The anode has a _____________ charge and is where ______________ occurs. This is the _________ of electrons
Other Answer Choices:
negative
loss
oxidation
1
The cathode has a _____________ charge and is where ______________ occurs. This is the _________ of electrons
Other Answer Choices:
oxidation
positive
loss
reduction
negative
gain
1
The electrons flow from the __________ to the ____________
Other Answer Choices:
cathode
anode
2
Hydrogen will enter at the __________.
Oxygen will enter at the ____________
Other Answer Choices:
cathode
anode
1
The hydrogen is _______ at the anode.
1
The oxygen is _______ at the cathode.
1
  • Only require O2 and H2
  • Do not produce CO2
  • Long lasting so more sustainable
  • Hydrogen is a gas so difficult to store
  • Hydrogen is explosive
  • Hydrogen is produced from cracking fossil fuels
  • Advantages
  • Disadvantages
1
Beth works for a company that makes hydrogen fuel cells. She measures the potential difference of the cell shown. Before she sets up the cell, Beth tests each gas to check its identity. Describe the tests and the results for hydrogen and oxygen gas.
Test for hydrogen ________splint.
Result for hydrogen test _________________
Test for oxygen ____________ splint.
Result for oxygen test ____________________
Other Answer Choices:
lit
glowing
splint relights
squeaky pop.
1
One mole of oxygen gas produces ______ mole of electrons but one mole of hydrogen produces ______ moles of electrons.
The electrons need to balance so twice as many moles of _____________are required.
Other Answer Choices:
4
2
hydrogen
1
A fuel cell filled with potassium hydroxide solution works better than one filled with pure water. One reason is that potassium hydroxide solution is a better electrical conductor than pure water. Explain why potassium hydroxide solution is a better electrical conductor than pure water.

Water decomposes to produce H+ and OH- at very low concentrations so in pure water there is a low concentration of elctrolysts and therfore pure water is a poor ______________ of electricity.
Potassium hydroxide is very soluble so the concentration of the ________________ is higher and the solution is a better conductor..
Other Answer Choices:
conductor
electrolyte