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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. Nitrogen dioxide (NO2) is produced at high temperatures in the engin... 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
05.2 Calculate the value (X) for Sunday concentrations.
Answer
To calculate the missing concentration (X) of nitrogen dioxide for Sunday in the city center, we can use the mean value:
Given that the mean for the week is 33 micrograms per m³:
Calculating this yields:
Thus, micrograms per m³.
Step 2
05.3 Explain uncertainty significance for countryside data.
Answer
The uncertainty of ±2 micrograms per m³ is most significant for countryside data because the nitrogen dioxide levels in the countryside are typically lower than in urban areas. A small percentage of uncertainty represents a larger proportion of the overall measurement when values are low, making it more critical to consider this uncertainty when assessing air quality in these less polluted areas.
Step 3
Step 4
05.5 Explain what is meant by 'a finite resource'.
Answer
A finite resource refers to a natural resource that has a limited supply and will eventually be depleted, such as platinum used in catalytic converters. It contrasts with renewable resources, which can be replenished naturally over time.
Step 5
05.6 Explain carbon dioxide emissions in the life cycle assessment.
Answer
Carbon dioxide emissions during the use and operation of cars are not the total carbon footprint because they also include:
- Extracting and processing raw materials: The emissions from mining and refining resources used to manufacture cars.
- Manufacturing: Emissions generated during the production and assembly of vehicles.
- Disposal at the end of its useful life: Emissions associated with the breakdown and recycling of vehicle parts after their operational life.