Atmospheric pollution is emitted by cars - AQA - GCSE Chemistry Combined Science - Question 5 - 2021 - Paper 2

To find the value of X, we can use the mean value equation:

$X = (33 \times 7) - (37 + 35 + 34 + 29)$

Calculating this gives:

$X = 231 - (37 + 35 + 34 + 29) = 231 - 135 = 96 \Rightarrow X = 22 \text{ micrograms per m}^3$

The uncertainty of 2 micrograms per m³ is particularly significant for countryside data because these values are generally low. Thus, a small fluctuation can represent a larger proportion of the measured concentration, leading to a greater impact on the accuracy and reliability of the data.

The balanced equation for the reaction in a catalytic converter is:

$2 NO₂ → N₂ + 2 O₂$

A finite resource is a natural resource that is limited in quantity and will eventually be depleted if not managed sustainably. For example, platinum is a finite resource because it is not renewable and its extraction contributes to environmental impact.

The carbon footprint of a car includes several stages beyond just emissions during use and operation. It also encompasses:

1. Extraction of Raw Materials: The carbon emissions associated with obtaining the materials needed to manufacture the car.
2. Manufacturing: Carbon emissions produced during the manufacturing process of the car components.
3. Disposal: Emissions related to the end-of-life disposal or recycling of the car.

Therefore, to fully assess the environmental impact, all stages from production to disposal must be considered.