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Edexcel IGCSE Chemistry

Topic questions Chemistry of the atmosphere Greenhouse gases & climate change

Greenhouse gases & climate change

9 questions · 74 marks · about 1.5 hours

Greenhouse gases and climate change questions

TopicGreenhouse gases & climate change

Edexcel 4CH1 Greenhouse gases and climate change 9 questions

Chemistry Paper 2 June 2025 (R), Question 1 6 marks

This question is about gases.

(a)

The box gives the names of some gases.

Figure for question 1

Choose gases from the box to answer questions (i) to (iv).

You may use each gas once, more than once or not at all.

(a)(i)

Identify two gases in Group 0 of the Periodic Table.

[1]
(a)(ii)

Identify the gas that makes up about 21% of the atmosphere.

[1]
Reveal mark scheme Mark scheme for question 1(a)(ii)
(a)(iii)

Identify a greenhouse gas.

[1]
Reveal mark scheme Mark scheme for question 1(a)(iii)
(a)(iv)

Identify the toxic gas formed by incomplete combustion of a hydrocarbon.

[1]
Reveal mark scheme Mark scheme for question 1(a)(iv)
(b)

Describe a test to show that a gas is carbon dioxide.

[2]
Reveal mark scheme Mark scheme for question 1(b)

Chemistry Paper 1 November 2023, Question 4 11 marks

This question is about gases.

(a)

The table gives information about five gases.

Name of gasargoncarbon dioxidehydrogenoxygennitrogen
Formula of gasArCO2H2O2N2
Mr of gas4023228

Use information from the table to answer these questions. Each gas may be used once, more than once or not at all.

(a)(i)

Give the name of the gas that is about 79 % of the atmosphere by volume.

[1]
Reveal mark scheme Mark scheme for question 4(a)(i)
(a)(ii)

Give the name of the gas that is a compound.

[1]
Reveal mark scheme Mark scheme for question 4(a)(ii)
(a)(iii)

Give the name of the least reactive gas.

[1]
Reveal mark scheme Mark scheme for question 4(a)(iii)
(a)(iv)

Give the name of the gas that is not normally found in the atmosphere.

[1]
Reveal mark scheme Mark scheme for question 4(a)(iv)
(a)(v)

Give the name of the gas that affects global warming.

[1]
Reveal mark scheme Mark scheme for question 4(a)(v)
(a)(vi)

Calculate the Mr for carbon dioxide.

[1]
Reveal mark scheme Mark scheme for question 4(a)(vi)
(a)(vii)

Give a reason why it is not possible to give information for air in the table.

[1]
Reveal mark scheme Mark scheme for question 4(a)(vii)
(b)

When copper(II) carbonate is heated, the products are copper(II) oxide and carbon dioxide.

(b)(i)

Give the name for this type of reaction.

[1]
Reveal mark scheme Mark scheme for question 4(b)(i)
(b)(ii)

Give the colour change that occurs during this reaction.

[2]
Reveal mark scheme Mark scheme for question 4(b)(ii)
(b)(iii)

Give a chemical equation for this reaction.

[1]
Reveal mark scheme Mark scheme for question 4(b)(iii)

Chemistry Paper 2 June 2023, Question 2 10 marks

This question is about gases in the atmosphere.

(a)

Which of these gases has the lowest percentage by volume in the atmosphere?

Question 2, shown as an image
[1]
Reveal mark scheme Mark scheme for question 2(a)
(b)

When copper(II) carbonate is heated, copper(II) oxide and carbon dioxide form.

(b)(i)

What is the name of this type of reaction?

Question 2, shown as an image
[1]
Reveal mark scheme Mark scheme for question 2(b)(i)
(b)(ii)

Which colour change occurs when copper(II) carbonate is heated?

Question 2, shown as an image
[1]
Reveal mark scheme Mark scheme for question 2(b)(ii)
(b)(iii)

Give the chemical equation for this reaction.

[1]
Reveal mark scheme Mark scheme for question 2(b)(iii)
(c)

A student uses this apparatus to find the percentage of oxygen in a sample of air.

Figure for question 2

The student leaves the apparatus until there is no further change in volume of gas in the syringe.

These are the student’s results.

Figure for question 2

Calculate the percentage of oxygen in the sample of air.

Give your answer to two significant figures.

[4]
Reveal mark scheme Mark scheme for question 2(c)
(d)

Explain why an increasing amount of carbon dioxide in the atmosphere is likely to cause a problem for the environment.

[2]
Reveal mark scheme Mark scheme for question 2(d)

Chemistry Paper 1 January 2023 (R), Question 2 7 marks

This question is about gases in the atmosphere.

(a)(i)

Name the most abundant gas in the atmosphere.

[1]
Reveal mark scheme Mark scheme for question 2(a)(i)
(a)(ii)

Name the noble gas that makes up about 1% of the atmosphere.

[1]
(a)(iii)

Name a greenhouse gas in the atmosphere.

[1]
Reveal mark scheme Mark scheme for question 2(a)(iii)
(b)

A student uses this apparatus to determine the percentage of oxygen in a sample of air.

Figure for question 2

This is the student’s method.

• measure the initial length of the column of air in the tube

• leave the apparatus for one week

• measure the final length of the column of air

The table shows the student’s results.

Figure for question 2
(b)(i)

State the appearance of the iron wool after one week.

[1]
Reveal mark scheme Mark scheme for question 2(b)(i)
(b)(ii)

Use the student’s results to show that the percentage of oxygen in the sample of air is approximately 18%.

[2]
Reveal mark scheme Mark scheme for question 2(b)(ii)
(b)(iii)

The actual percentage of oxygen in air is approximately 21%.

Give a reason why the percentage of air calculated from the student’s results is less than 21%.

[1]
Reveal mark scheme Mark scheme for question 2(b)(iii)

Chemistry Paper 2 June 2022, Question 1 6 marks

This question is about gases in the atmosphere.

The box gives the names of some gases.

Figure for question 1
(a)

Choose gases from the box to answer these questions.

(a)(i)

Identify the least reactive gas in the atmosphere.

[1]
Reveal mark scheme Mark scheme for question 1(a)(i)
(a)(ii)

Identify the most abundant gas in the atmosphere.

[1]
Reveal mark scheme Mark scheme for question 1(a)(ii)
(a)(iii)

Identify the gas that is not normally found in the atmosphere.

[1]
Reveal mark scheme Mark scheme for question 1(a)(iii)
(b)

State an environmental problem caused by increasing amounts of carbon dioxide in the atmosphere.

[1]
Reveal mark scheme Mark scheme for question 1(b)
(c)

Describe a test for carbon dioxide.

[2]
Reveal mark scheme Mark scheme for question 1(c)

Chemistry Paper 2 January 2022, Question 2 8 marks

This question is about gases in the air.

The pie chart represents the percentages of gases in dry, unpolluted air.

Gases with percentages of less than 1% in air are called trace gases.

Figure for question 2
(a)(i)

Which of these is gas Z?

Question 2, shown as an image
[1]
Reveal mark scheme Mark scheme for question 2(a)(i)
(a)(ii)

Which of these is the approximate percentage of oxygen in dry, unpolluted air?

Question 2, shown as an image
[1]
Reveal mark scheme Mark scheme for question 2(a)(ii)
(b)

One of the trace gases is carbon dioxide.

(b)(i)

Identify two reactions that produce carbon dioxide by placing a tick (✓) in two boxes.

Figure for question 2
[2]
Reveal mark scheme Mark scheme for question 2(b)(i)
(b)(ii)

Name an environmental problem that is caused by the percentage of carbon dioxide increasing in the atmosphere.

[1]
Reveal mark scheme Mark scheme for question 2(b)(ii)
(b)(iii)

Name the trace gas with the highest percentage in dry, unpolluted air.

[1]
(c)

Rainwater is acidic because carbon dioxide dissolves in water to form carbonic acid.

Acid rain is more acidic than rainwater because acidic pollutant gases also dissolve in water.

(c)(i)

Give the name of the acid that forms when nitrogen dioxide dissolves in water.

[1]
Reveal mark scheme Mark scheme for question 2(c)(i)
(c)(ii)

Name another pollutant gas that also forms acid rain.

[1]
Reveal mark scheme Mark scheme for question 2(c)(ii)

Chemistry Paper 1 January 2021 (R), Question 8 15 marks

Also involves Relative formula mass · Moles and amount of substance

(a)(i)

Organic compounds can exist as isomers.

Explain what is meant by the term isomers.

[2]
Reveal mark scheme Mark scheme for question 8(a)(i)
(a)(ii)

Organic compound Q reacts with bromine, without the presence of ultraviolet radiation, to form the compound C4H8Br2

Draw the displayed formulae of two isomers of Q.

Figure for question 8
[2]
Reveal mark scheme Mark scheme for question 8(a)(ii)
(b)

An acrylic polymer can be formed from molecules with this structure.

Question 8, shown as an image
Question 8, shown as an image
Question 8, shown as an image
(b)(i)

A student describes the molecule as an unsaturated hydrocarbon.

Explain whether this is a correct description.

[2]
Reveal mark scheme Mark scheme for question 8(b)(i)
(b)(ii)

Name the type of polymerisation that occurs in the formation of the polymer.

[1]
Reveal mark scheme Mark scheme for question 8(b)(ii)
(b)(iii)

Complete the equation for the polymerisation reaction.

Question 8, shown as an image
Question 8, shown as an image
Question 8, shown as an image
[2]
Reveal mark scheme Mark scheme for question 8(b)(iii)
(c)

Octane is a compound in petrol.

The equation for the complete combustion of octane is

Question 8, shown as an image
(c)(i)

The fuel tank of a car contains 50.0 dm3 of octane.

Calculate the mass, in kg, of carbon dioxide formed if all the octane in the fuel tank undergoes complete combustion.

[mass of 1 dm3 of octane = 700 g]

[5]
Reveal mark scheme Mark scheme for question 8(c)(i)
(c)(ii)

State an environmental problem caused by carbon dioxide.

[1]
Reveal mark scheme Mark scheme for question 8(c)(ii)

Chemistry Paper 1 January 2020, Question 1 6 marks

This question is about gases in the atmosphere.

(a)

The box gives the names of some gases in the atmosphere.

Figure for question 1

Choose gases from the box to answer these questions.

Each gas may be used once, more than once or not at all.

(a)(i)

Identify a noble gas.

[1]
Reveal mark scheme Mark scheme for question 1(a)(i)
(a)(ii)

Identify a gas that makes up about 78% of the atmosphere.

[1]
Reveal mark scheme Mark scheme for question 1(a)(ii)
(a)(iii)

Identify a greenhouse gas.

[1]
Reveal mark scheme Mark scheme for question 1(a)(iii)
(a)(iv)

Identify a gas produced by the thermal decomposition of calcium carbonate.

[1]
Reveal mark scheme Mark scheme for question 1(a)(iv)
(b)

Sulfur reacts with oxygen to produce sulfur dioxide gas.

(b)(i)

Write a chemical equation for this reaction.

[1]
Reveal mark scheme Mark scheme for question 1(b)(i)
(b)(ii)

State an environmental problem caused when sulfur dioxide gas dissolves in water in the atmosphere.

[1]
Reveal mark scheme Mark scheme for question 1(b)(ii)

Chemistry Paper 2 June 2019 (R), Question 1 5 marks

This question is about gases in the atmosphere.

(a)

The box gives the names of some gases in the atmosphere.

Figure for question 1

Use gases from the box to answer the questions.

Each gas may be used once, more than once or not at all.

(a)(i)

Identify the two noble gases.

[1]
Reveal mark scheme Mark scheme for question 1(a)(i)
(a)(ii)

Identify the gas that is a compound.

[1]
Reveal mark scheme Mark scheme for question 1(a)(ii)
(a)(iii)

Identify the most abundant gas in the atmosphere.

[1]
Reveal mark scheme Mark scheme for question 1(a)(iii)
(a)(iv)

Identify the greenhouse gas.

[1]
Reveal mark scheme Mark scheme for question 1(a)(iv)
(b)

Describe the test for oxygen.

[1]
Reveal mark scheme Mark scheme for question 1(b)

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