Hydrogen, H₂, fuel cells and H₂-powered combustion engines can both be used to power cars - VCE - SSCE Chemistry - Question 13 - 2020 - Paper 1
Question 13
Hydrogen, H₂, fuel cells and H₂-powered combustion engines can both be used to power cars. Three statements about H₂ fuel cells and H₂-powered combustion engines are... show full transcript
Worked Solution & Example Answer:Hydrogen, H₂, fuel cells and H₂-powered combustion engines can both be used to power cars - VCE - SSCE Chemistry - Question 13 - 2020 - Paper 1
Step 1
1. Neither H₂ fuel cells nor H₂-powered combustion engines produce greenhouse gases.
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Answer
This statement is true. Both H₂ fuel cells and H₂-powered combustion engines do not emit greenhouse gases during operation, only producing water vapor.
Step 2
2. Less H₂ is required per kilometre travelled when using an H₂-powered combustion engine than when using H₂ fuel cells.
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Answer
This statement is false. Generally, H₂ fuel cells are more efficient than combustion engines, meaning they require less H₂ per kilometre.
Step 3
3. More heat per kilogram of H₂ is generated in an H₂-powered combustion engine than in H₂ fuel cells.
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Answer
This statement is true. H₂ combustion engines generate more heat energy per kilogram of H₂ compared to fuel cells since combustion produces additional thermal energy.
