CAIE IGCSE Chemistry Environment Questions

Practise water treatment, atmospheric composition, pollutants, greenhouse gases, fertilisers and environmental cycles across the CAIE IGCSE Chemistry unit.

Covered syllabus points

10.1 Water 10.2 Fertilisers 10.3 Air quality and climate

[Maximum number: 2]

Cobalt and copper are transition elements.

Both copper and cobalt can form coloured compounds. Some of these compounds contain water of crystallisation.

State the colour change seen when a few drops of water are added to anhydrous copper(II) sulfate.
from to

[Maximum number: 1]

The Haber process is used to manufacture ammonia.

Ammonia reacts with an acid to form ammonium sulfate, $\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4}$ .

State one use of ammonium sulfate.

[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: 5]

(a)

Filtration and chlorination are two stages in water treatment.
State the purpose of each stage.
filtration
chlorination

[ 2 ]

(b)

A student uses anhydrous copper(II) sulfate to test for the presence of water.

[ 3 ]

(i)

What colour change is seen if water is present?
from to

[ 2 ]

(ii)

The purity of a sample of water can be assessed by measuring its boiling point.

How is the boiling point of water affected by impurities?

[ 1 ]

higher boiling point / greater than $100^{\circ} \mathrm{C}$

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Covered syllabus points

10. Chemistry of the environment question 1

10. Chemistry of the environment question 2

10. Chemistry of the environment question 3

Question (a)

Question (b)

Question (c)

Question (d)

Question (e)

Question (f)

10. Chemistry of the environment question 4

Question (a)

Question (b)

Question (i)

Question (ii)