Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Inorganic Chemistry
869 practice questions
Topics covered
- The Alkali Metals85 practice questions
- The Halogens86 practice questions
- Gases in the Atmosphere86 practice questions
- Reactivity Series163 practice questions
- Extraction and Uses of Metals128 practice questions
- Acids, Alkalis and Titrations83 practice questions
- Acids, Bases and Salt Preparations156 practice questions
- Chemical Tests68 practice questions
Practice questions
41–50 of 136 · Hard
Question 41
2 marks · Hard
Answer and see the solution →Explain why carbon dioxide, but not nitrogen, can act as a greenhouse gas.
Question 42
7 marks · Hard
Answer and see the solution →This question is about the composition of air and the environmental impact of greenhouse gases.
(a)[1 mark]State the approximate percentage by volume of oxygen in dry air.
(b)[2 marks]Explain, using your knowledge of greenhouse gases, why increasing the amount of carbon dioxide in the atmosphere matters.
(c)[2 marks]A student claims that the Earth’s atmosphere could safely be made up almost entirely of carbon dioxide, so long as there is still about 21% oxygen for breathing. Explain, using scientific reasons, whether you agree with this statement.
(d)[2 marks]State one major human activity that increases the amount of carbon dioxide in the atmosphere and explain how it contributes to environmental change.
Question 43
7 marks · Hard
Answer and see the solution →This question is about experiments to measure oxygen in air and the formation of carbon dioxide from metal carbonates.
(a)[3 marks]Describe how an experiment using wet iron filings can be used to determine the percentage of oxygen in air. Include the main steps and how the data is used.
(b)A student heats 1.50 g of copper(II) carbonate and collects 275 cm³ of gas at room temperature and pressure. (i) Name the gas collected. (ii) Write a balanced equation for the reaction. (iii) Explain why the solid left at the end of the experiment has a different colour to the original solid.
(i)[1 mark]Name the gas collected.
(ii)[1 mark]Write a balanced equation for the reaction.
(iii)[1 mark]Explain why the solid left at the end of the experiment has a different colour to the original solid.
(c)[1 mark]State and explain one precaution that should be taken when interpreting the percentage of oxygen obtained from the iron experiment.
Question 44
8 marks · Hard
Answer and see the solution →The table below shows the main gases present in dry, unpolluted air:
Approximate composition of dry air Gas Percentage by volume (%) Nitrogen 78 Oxygen 21 Argon 1 Carbon dioxide 0.04 Read the data carefully. Then refer to the information provided to answer the following questions about atmospheric composition and environmental impact.
(a)[2 marks]State the two most abundant gases in dry air and their approximate percentages by volume.
(b)[1 mark]Suggest a reason for the very low percentage of carbon dioxide, even though its environmental impact is significant.
(c)[3 marks]Describe, with reference to an experiment involving copper, how you could show that air contains about one-fifth oxygen by volume.
(d)[2 marks]Explain what is meant by the term 'greenhouse gas', and why carbon dioxide is an important greenhouse gas.
Question 45
2 marks · Hard
Answer and see the solution →Copper(II) oxide reacts with a solid element X when heated, producing copper metal and a white solid. Element X cannot displace magnesium from magnesium oxide.
Question 46
5 marks · Hard
Answer and see the solution →A student heats powdered samples of four different metals (A, B, C, D) separately with iron(III) oxide. The results are shown:
Observations of reactions with iron(III) oxide Metal Observation with iron(III) oxide A A bright reaction. Grey metal formed. B No visible change. C Slow reaction with faint glow. Grey metal appeared. D No reaction even after strong heating. (a)[2 marks]Arrange the four metals (A, B, C, D) in order of their reactivity, from most reactive to least reactive, based on the observations above.
(b)[3 marks]Suggest what happens chemically when metal A reacts with iron(III) oxide. State which metal is reduced and which is oxidised.
Question 47
2 marks · Hard
Answer and see the solution →State what is meant by the term 'reducing agent' in a redox reaction, and give an example from a reaction involving metal oxides.
Question 48
2 marks · Hard
Answer and see the solution →In the reaction below, identify the oxidising agent and the reducing agent: State each answer as a chemical formula.
Question 49
5 marks · Hard
Answer and see the solution →The following ionic equation represents a reaction between zinc metal and copper(II) ions:
(a)[2 marks]State which species is oxidised and which is reduced. Give your answers as chemical symbols or formulae.
(b)[1 mark]Write a half-equation for the oxidation process.
(c)[2 marks]Explain, in terms of electron transfer, why zinc is considered a reducing agent in this reaction.
Question 50
2 marks · Hard
Answer and see the solution →Describe what is meant by 'oxidation' and 'reduction', in terms of oxygen transfer.