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Fuel Cells (GCSE Chemistry)

The following is a GCSE Chemistry test covering 'Fuel Cells' from the broader topic Energy Changes. The test is geared towards the AQA exam board style syllabus.
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What is a major economic barrier to wide fuel cell adoption currently?
What is the primary function of a hydrogen fuel cell?
Which property of fuel cells makes them attractive for backup power in data centres?
Which fuel can be used directly in a direct methanol fuel cell (DMFC)?
One advantage of a hydrogen fuel cell over a combustion engine is:
Which of the following best describes “green hydrogen”?
How does the efficiency of a well-operated fuel cell system typically compare to that of internal combustion engines for converting fuel energy to useful electrical energy?
Which of the following is the overall chemical reaction in a typical hydrogen fuel cell?
Which of the following is an advantage of using a fuel cell for stationary power generation compared to combustion-based generators?
Why can carbon monoxide (CO) be harmful to many fuel cells?
How does raising the temperature generally affect the performance of a solid oxide fuel cell (SOFC)?