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Complete the sentences about the air. Use words from the list. Each word may be used once, more than once or not at all. argon compound element methane mixture nitrogen oxygen ON ok: of gases. Clean, noble found small quantities Agas that pollutes
See it on the paper →Clean, dry air is a mixture of gases. State the percentage of clean, dry air which is nitrogen.
See it on the paper →Table 7.1 shows the composition of clean dry air and of exhaust gases. Table 7.1 gases percentage by volume in clean dry air / % percentage by volume in exhaust gases / % carbon dioxide and other gases 1 13 nitrogen oxygen water 0 67 9 11 Complete Table 7.1. (ii)
See it on the paper →Carbon dioxide is one of the gases found in clean air. State the name of the two gases found in clean air in the greatest proportions.
See it on the paper →What is the composition of the air in the balloon?
See it on the paper →is 78% of clean air.
See it on the paper →A sample of clean air contains nitrogen and other gases. State the percentage of nitrogen in the sample of clean air. %
See it on the paper →Comprehensive responses • Many candidates stated the value of 78%. Limited responses • Common other values included 72% and 21% instead of 78%.
— Examiner report, February/March 2026, 0654/42 Q5(b) (Cambridge)
The percentage of nitrogen in clean air was well known. A number of candidates suggested 70%.
— Examiner report, February/March 2024, 0654/32 Q5(a) (Cambridge)
The question asked candidates to use their knowledge of the amounts of nitrogen and oxygen in the air to suggest the percentage of the section labelled other gases. Some candidates did this effectively. Others attempted to estimate percentages from the angle shown on the pie chart.
— Examiner report, October/November 2019, 0654/33 Q8(a)(i) (Cambridge)
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Which statement about the treatment of the water supply is correct?
What is the percentage of oxygen inside the balloon?
See it on the paper →Suggest the percentage of the section labelled other gases. Use your knowledge of the amounts of nitrogen and oxygen in air. percentage of other gases = %
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