Renewable fuels
Bioethanol and hydrogen are fuels that can be used instead of fossil fuels - Edexcel - GCSE Chemistry - Question 5 - 2015 - Paper 1
Question 5
Renewable fuels
Bioethanol and hydrogen are fuels that can be used instead of fossil fuels.
(a) Complete the sentence by putting a cross (X) in the box next to you... show full transcript
Worked Solution & Example Answer:Renewable fuels
Bioethanol and hydrogen are fuels that can be used instead of fossil fuels - Edexcel - GCSE Chemistry - Question 5 - 2015 - Paper 1
Step 1
Complete the sentence by putting a cross (X) in the box next to your answer.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The correct option is C: produce heat energy when they burn. All fuels must produce heat energy when burned, as this is the primary function of a fuel.
Step 2
Write the word equation for this reaction.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The word equation for the reaction of hydrogen with oxygen to form water is:
Hydrogen + Oxygen → Water
Step 3
State one advantage of using hydrogen, rather than petrol, as a fuel for vehicles.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
One advantage of using hydrogen as a fuel is that it is renewable and produces only water as a byproduct when combusted, leading to a reduction in greenhouse gas emissions.
Step 4
Explain one disadvantage of using hydrogen as a fuel for vehicles.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
One disadvantage of using hydrogen is that it is a colourless and odourless gas, which makes it difficult to detect leaks. Leaked hydrogen can mix with oxygen and pose an explosion risk if ignited. Moreover, storing hydrogen requires strong tanks, adding to the complexity of its use.
