This question is about pollutants - AQA - GCSE Chemistry Combined Science - Question 3 - 2020 - Paper 2
Question 3
This question is about pollutants.
Waste water has harmful substances removed before being released into the environment.
Complete the sentences.
Agricultural was... show full transcript
Worked Solution & Example Answer:This question is about pollutants - AQA - GCSE Chemistry Combined Science - Question 3 - 2020 - Paper 2
Step 1
Agricultural waste water requires the removal of harmful
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microbes or chemicals.
Step 2
Industrial waste water may require the removal of harmful
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microbes or chemicals.
Step 3
How is sewage sludge treated before being released into the environment? Tick (✓) one box.
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Anaerobic digestion.
Step 4
Calculate the percentage decrease in the number of plastic bags used.
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Respiratory problems or acid rain.
Step 6
Suggest why the mass of oxides of nitrogen produced from car engines increased and then decreased.
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The mass of nitrogen oxides increased due to more traffic and a higher number of cars on the road. It decreased because of improved efficiency of car engines, including the use of catalytic converters to reduce emissions.
