IGCSE Co-ordinated Sciences (9–1) 0973 · Chemistry · 118

0654.C10.2.01 — State the composition of clean, dry air as approximately 78% nitrogen, N2, 21% oxygen, O2, and the remainder as a mixture of noble gases and: past paper questions

5 real questionsasked in 2 of the last 10 exam series2019–2024usually: State

Real questions on 0654.c10.2.01 — state the composition of clean, dry air as approximately 78% nitrogen, n2, 21% oxygen, o2, and the remainder as a mixture of noble gases and

The newest 5 of 5 written questions. Open one to see it on the real paper.

0973/31 · October/November 2024 · Q2a(iii)[1]
an element that makes up 21% of clean air
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0973/31 · May/June 2022 · Q8a(iii)[1]
State the name of the gas from Table 8.1 that is 78% of clean air.
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0973/32 · May/June 2022 · Q2a(ii)[1]
State the name of an element from Table 2.1 which is 78% of clean air.
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0973/31 · May/June 2021 · Q5c(i)[1]
State the names of the two gases which are found in large quantities in clean air. and
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0973/41 · October/November 2019 · Q2a[2]
Fig. 2.1 is a pie chart which shows the composition of clean air. other gases oxygen % nitrogen % Fig. 2.1 Complete Fig. 2.1 to show the percentages of oxygen and of nitrogen in clean air.
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What examiners said

Some candidates correctly identified nitrogen. Many others suggested oxygen.
— Examiner report, May/June 2022, 0973/31 Q8(a)(iii) (Cambridge)

Oxygen and nitrogen were well known as the two gases found in large quantities in clean air.
— Examiner report, May/June 2021, 0973/31 Q5(c)(i) (Cambridge)

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In the syllabus

118 0654.C10.2.01 — State the composition of clean, dry air as approximately 78% nitrogen, N2, 21% oxygen, O2, and the remainder as a mixture of noble gases and

State the composition of clean, dry air as approximately 78% nitrogen, N2, 21% oxygen, O2, and the remainder as a mixture of noble gases and carbon dioxide, CO2
State the source of each of these air pollutants, limited to: (a) . carbon dioxide from the complete combustion of carbon-containing fuels (b) . carbon monoxide and particulates from the incomplete combustion of carbon- containing fuels (c) . methane from the decomposition of vegetation and waste gases from digestion in animals (d) . oxides of nitrogen from car engines (e) . sulfur dioxide from the combustion of fossil fuels which contain sulfur compounds
State the adverse effect of these air pollutants, limited to: (a). carbon dioxide: higher levels of carbon dioxide leading to increased global warming, which leads to climate change (b). carbon monoxide: toxic gas (c). particulates: increased risk of respiratory problems and cancer (d). methane: higher levels of methane leading to increased global warming, which leads to climate change (e). oxides of nitrogen: acid rain and respiratory problems (f). sulfur dioxide: acid rain
State and explain strategies to reduce the effects of climate change: (a). planting trees (b). reduction in livestock farming (c). decreasing use of fossil fuels (d). increasing use of hydrogen and renewable energy, e.g. wind, solar
State and explain strategies to reduce the effects of acid rain: reducing emissions of sulfur dioxide by using low-sulfur fuels and flue gas desulfurisation with calcium oxide
Describe how the greenhouse gases carbon dioxide and methane cause global warming, limited to: (a). the absorption, reflection and emission of thermal energy (b). reducing thermal energy loss to space
Explain how oxides of nitrogen form in car engines and describe their removal by catalytic converters, limited to: 2CO + 2NO → 2CO2 + N2

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