Describe how nitrogen dioxide (NO₂) is produced in the engine of a car that burns fossil fuels - AQA - GCSE Chemistry Combined Science - Question 5 - 2021 - Paper 2
Question 5
Describe how nitrogen dioxide (NO₂) is produced in the engine of a car that burns fossil fuels.
At high temperatures in the engine,
nitrogen reacts with oxygen (to ... show full transcript
Worked Solution & Example Answer:Describe how nitrogen dioxide (NO₂) is produced in the engine of a car that burns fossil fuels - AQA - GCSE Chemistry Combined Science - Question 5 - 2021 - Paper 2
Step 1
Each value in Table 3 has an uncertainty of 2 micrograms per m².
Explain why this uncertainty is most significant for countryside data.
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Answer
Countryside data has the smallest values; therefore, the percentage uncertainty is higher. For example, if the concentration is 8 micrograms per m², an uncertainty of ±2 micrograms is significant, representing 25% of the total value.
Step 2
In a catalytic converter nitrogen dioxide (NO₂) reacts to produce nitrogen and oxygen.
Complete the equation for the reaction.
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Answer
The balanced equation is:
ightarrow ext{N}_2 + 2 ext{O}_2$$
Step 3
What is meant by a 'finite resource'?
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A resource which will run out; it refers to a non-sustainable resource.
Step 4
Explain why carbon dioxide emissions during use and operation are not the total carbon footprint for a car in your answer.
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The carbon footprint also includes emissions from extracting and processing raw materials, manufacturing the car, and disposal at the end of its useful life.
