Cambridge IGCSE · Chemistry (0620)

Air quality and climate: Practice Questions

5 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on Air quality and climate.

10 questions24 marksFree, no account

Question 1

1 mark

Which gas makes up approximately 78% of clean, dry air?

Question 2

1 mark

Which strategy is specifically used to reduce the amount of sulfur dioxide released into the atmosphere from power stations?

Question 3

1 mark

A sample of clean, dry air contains several gases. Which statement correctly identifies the order of abundance (from most to least) and a correct property of one of these gases?

Question 4

1 mark

Which process is a major source of sulfur dioxide in the atmosphere?

Question 5

1 mark

Which is the correct balanced symbol equation for photosynthesis?

Question 6

2 marks

State the names of the two most abundant gases in clean, dry air and provide their approximate percentages by volume.

Write your answer out first, then check it against the worked solution.

Question 7

3 marks

Explain why carbon monoxide is classified as a toxic gas in the context of human health.

Write your answer out first, then check it against the worked solution.

Question 8

5 marks

Describe the mechanism by which greenhouse gases such as carbon dioxide and methane cause global warming.

Write your answer out first, then check it against the worked solution.

Question 9

4 marks

The Earth's atmosphere consists of a mixture of gases.
(a) State the approximate percentages by volume of the following gases in clean, dry air:
i. Nitrogen, \( \text{N}_2 \)
ii. Oxygen, \( \text{O}_2 \)
iii. The mixture of noble gases and carbon dioxide.
(b) Name one air pollutant produced from the incomplete combustion of carbon-containing fuels.

Write your answer out first, then check it against the worked solution.

Question 10

5 marks

Photosynthesis is a vital process that regulates the levels of carbon dioxide and oxygen in the atmosphere.
(a) Write the word equation for photosynthesis.
(b) State the two essential conditions required for this reaction to occur in plants.
(c) Write the balanced symbol equation for photosynthesis.

Write your answer out first, then check it against the worked solution.

* The content provided by thinka is generated by AI and may not always be accurate or up-to-date. Please use it as a supplementary resource and verify with official materials.

You've seen the model answer. Now get yours marked.

This page can show you how a good answer looks. It cannot tell you what your answer was missing. thinka marks your written work against the real mark scheme in about 15 seconds.

Get My Answers Marked Back to the notes

Want more questions like these? Get a fresh set on this topic, marked as you go.