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This question is about emissions of oxides of nitrogen from petrol and diesel engines - AQA - A-Level Chemistry - Question 1 - 2020 - Paper 3
Question 1
This question is about emissions of oxides of nitrogen from petrol and diesel engines. 1. Explain how oxides of nitrogen are formed in engines. 2. State why it is ... show full transcript
Worked Solution & Example Answer:This question is about emissions of oxides of nitrogen from petrol and diesel engines - AQA - A-Level Chemistry - Question 1 - 2020 - Paper 3
Step 1
1. Explain how oxides of nitrogen are formed in engines.
Answer
Oxides of nitrogen, or NOx, are primarily formed in engines through the reaction of nitrogen and oxygen from the air at high temperatures. During combustion, the extreme heat enables nitrogen molecules in the air to react with oxygen, producing various nitrogen oxides.
Step 2
2. State why it is desirable to decrease emissions of oxides of nitrogen from vehicles.
Answer
It is desirable to decrease emissions of oxides of nitrogen from vehicles to reduce the formation of acid rain and mitigate respiratory problems in humans. High concentrations of NOx can lead to the formation of ground-level ozone, which is harmful to health and the environment.
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4. State the meaning of the term heterogeneous catalyst.
Answer
A heterogeneous catalyst is a catalyst that exists in a different phase (state) from the reactants. In other words, it usually exists in solid form while the reactants are in gas or liquid form, facilitating the reaction without being consumed in the process.
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