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1 Carbon dioxide and sulfur dioxide are air pollutants - Edexcel - GCSE Biology - Question 1 - 2018 - Paper 1
Question 1
1 Carbon dioxide and sulfur dioxide are air pollutants. The table shows the mass of carbon dioxide added to and removed from the atmosphere per year by three proces... show full transcript
Worked Solution & Example Answer:1 Carbon dioxide and sulfur dioxide are air pollutants - Edexcel - GCSE Biology - Question 1 - 2018 - Paper 1
Step 1
Calculate the overall change in the mass of carbon dioxide in the atmosphere per year.
Answer
To calculate the overall change, we need to sum the carbon dioxide added and subtract the carbon dioxide removed from the atmosphere.
From the table,
- Process X adds 140 tonnes
- Process Y adds 20 tonnes
- Process Z adds 0 tonnes
Total added = 140 + 20 + 0 = 160 tonnes.
Now, we need to subtract the mass removed by Process Z:
- Removed = 135 tonnes.
Therefore, the overall change is:
Overall change = Total added - Total removed Overall change = 160 - 135 = 25 tonnes.
Thus, the overall change in the mass of carbon dioxide in the atmosphere per year is 25 tonnes.
Step 2