CAIE IGCSE Chemistry Air Pollution and Climate Questions

Practise clean-air composition, pollutant sources and effects, greenhouse gases and carbon-cycle processes using equations, data and environmental evidence.

Exam points

recall clean dry air composition and identify gases from percentage or boiling-point data
match carbon monoxide, sulfur dioxide, nitrogen oxides, methane and particulates to sources and effects
explain greenhouse warming and use photosynthesis, respiration and combustion in carbon-cycle questions

Covered syllabus points

10.3.1—Composition of clean, dry air as 10.3.2—Air pollutant sources: CO2 from 10.3.3—Pollutant effects: CO2 and methane 10.3.7—Greenhouse gases carbon dioxide and 10.3.4—Reduction strategies: for climate 10.3.5—Photosynthesis as the reaction between 10.3.6—Word equation for photosynthesis 10.3.8—How oxides of nitrogen form in car 10.3.9—Symbol equation for photosynthesis

[Maximum number: 7]

This question is about gases found in clean, dry air and gases found in polluted air.

(a)

Name one gas found in clean, dry air which contributes to global warming.

[ 1 ]

(b)

State the percentage of nitrogen in clean, dry air.

[ 1 ]

(c)

Name the substance used to remove sulfur dioxide in flue gas desulfurisation.

[ 1 ]

(d)

Nitrogen dioxide, $\mathrm{NO}_{2}$ , is formed in car engines.

Name the equipment in a car exhaust used to remove the $\mathrm{NO}_{2}$ formed in car engines.

[ 1 ]

(e)

State one adverse effect of carbon monoxide on human health.

[ 1 ]

(f)

Carbon dioxide, $\mathrm{CO}_{2}$ , is a reactant in photosynthesis.

Name the two products of photosynthesis. and

[ 2 ]

[Maximum number: 1]

Petroleum is a useful natural resource.

The diagram shows how petroleum can be separated into useful substances.

Figure for Question 10.3 Air quality and climate question 2 — CAIE IGCSE Chemistry

Refinery gas is a mixture of hydrocarbons.

One refinery gas is butane, $\mathrm{C}_{4} \mathrm{H}_{10}$ .

Name the toxic gas produced by the incomplete combustion of butane.

[Maximum number: 1]

The symbols of the elements of Period 3 of the Periodic Table are shown.

Table for Question 10.3 Air quality and climate question 3 — CAIE IGCSE Chemistry

Answer the following questions about these elements.
Each element may be used once, more than once or not at all.
Write the symbol of an element which:

forms an oxide which leads to acid rain

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Covered syllabus points

10.3 Air quality and climate question 1

Question (a)

Question (b)

Question (c)

Question (d)

Question (e)

Question (f)

10.3 Air quality and climate question 2

10.3 Air quality and climate question 3