ExpertMedium2 marksMultiple Choice
AQA GCSE · Question 02.6 · Chemistry of the atmosphere
Which two gases are produced when fuels burn in car engines? Select two options.
Which two gases are produced when fuels burn in car engines? Select two options.
Answer options:
A.
Ammonia
B.
Carbon dioxide
C.
Carbon monoxide
D.
Nitrogen
E.
Oxygen
How to approach this question
Consider the process of combustion of hydrocarbon fuels in a car engine.
1. What is produced during complete combustion?
2. What is produced during incomplete combustion, which can happen when there isn't enough oxygen?
3. Select the two correct products from the list.
Full Answer
Carbon dioxide, Carbon monoxide
When hydrocarbon fuels burn in a car engine, two main types of combustion can occur:
1. **Complete combustion:** If there is plenty of oxygen, the fuel burns completely to produce carbon dioxide (CO₂) and water (H₂O).
2. **Incomplete combustion:** If there is a limited supply of oxygen, the fuel does not burn completely. This produces carbon monoxide (CO), a toxic gas, and particulates (soot), as well as some carbon dioxide and water.
Both carbon dioxide and carbon monoxide are common products from car engines.
Common mistakes
✗ Selecting oxygen, which is a reactant.
✗ Selecting nitrogen, which is mostly unreactive.
✗ Only selecting one correct answer.
Practice the full AQA GCSE Chemistry Foundation Tier Paper 2
60 questions · hints · full answers · grading
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