This question is about water - AQA - GCSE Chemistry - Question 2 - 2020 - Paper 2
Question 2
This question is about water.
In the UK, potable (drinking) water is produced from different sources of fresh water.
Explain how potable water is produced from fres... show full transcript
Worked Solution & Example Answer:This question is about water - AQA - GCSE Chemistry - Question 2 - 2020 - Paper 2
Step 1
Explain how potable water is produced from fresh water.
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Answer
Potable water in the UK is produced through several crucial steps. Firstly, an appropriate source of fresh water is chosen, which can be rivers, streams, lakes, or boreholes. Next, the selected water passes through filter beds, where solid impurities are removed. Following this, the water is sterilized to eliminate harmful microbes, typically using chlorine, ozone, or ultraviolet (UV) light.
Step 2
Suggest one process this country could use to obtain most of its potable water.
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Answer
One viable process for obtaining potable water in a country with very little rainfall is reverse osmosis, which allows for desalination of seawater, effectively producing drinking water.
Step 3
Draw one line from each substance to the way the substance is processed.
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Calculate the percentage of processed solid sewage sludge that was burned in 2010.
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Answer
To calculate the percentage:
ext{Percentage burned} = rac{260}{1413} imes 100 \\ = 18.4\%
Step 5
Suggest one reason why the total mass of processed solid sewage sludge increased between 1992 and 2010.
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One reason for the increase in the total mass of processed solid sewage sludge is the growing population, which results in more waste water being produced.
Step 6
Suggest two reasons why.
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Answer
The increased demand for food due to an expanding population leads to more farming, thus generating more organic waste.
A growing awareness of the environmental impacts of waste management may influence more sludge to be processed into fertiliser.
