Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Gases in the Atmosphere
86 practice questions
Topics covered
Practice questions
71–80 of 86
Question 71
4 marks · Normal
Answer and see the solution →A student performs an experiment by heating copper(II) carbonate in a test tube over a Bunsen burner.
(a)[1 mark]State the initial colour of copper(II) carbonate.
(b)[1 mark]Describe the change in appearance during heating.
(c)[2 marks]Name the gas released and describe a test to confirm its identity.
Question 72
3 marks · Normal
Answer and see the solution →In the year 1800, the concentration of carbon dioxide (CO₂) in the atmosphere was about 280 parts per million (ppm). In 2020, it was measured at approximately 410 ppm.
Calculate the percentage increase in carbon dioxide concentration in the atmosphere between 1800 and 2020. Show your working and give your answer to 1 decimal place.
Question 73
2 marks · Hard
Answer and see the solution →Explain two reasons why an increase in the concentration of carbon dioxide in the atmosphere could lead to changes in Earth's climate.
Question 74
5 marks · Hard
Answer and see the solution →A student heats a sample of iron(II) carbonate to investigate the formation of carbon dioxide gas.
(a)[2 marks]Write the balanced chemical equation, including state symbols, for the thermal decomposition of iron(II) carbonate.
(b)[1 mark]State the type of reaction taking place.
(c)[1 mark]Describe one observation the student would make as the reaction occurs.
(d)[1 mark]Name the gas formed in this reaction.
Question 75
2 marks · Hard
Answer and see the solution →Explain why carbon dioxide, but not nitrogen, can act as a greenhouse gas.
Question 76
5 marks · Easy
Answer and see the solution →This question is about gases in air and combustion in oxygen.
(a)[2 marks]State the approximate percentage by volume of oxygen and nitrogen in dry air.
(b)[2 marks]Describe the complete combustion of magnesium in oxygen. State the chemical formula of the product formed.
(c)[1 mark]Which property of oxygen explains why elements burn more brightly in oxygen than in air?
Question 77
5 marks · Easy
Answer and see the solution →This question is about experiments to show the amount of oxygen in air, and the combustion of elements in oxygen.
(a)[2 marks]Describe how an experiment using wet iron filings can be used to find the approximate percentage of oxygen in air. State one precaution needed for an accurate result.
(b)[1 mark]A student burns magnesium ribbon in pure oxygen. State the chemical name and appearance of the solid product formed.
(c)[2 marks]Explain why elements burn more brightly in pure oxygen than in air.
Question 78
5 marks · Easy
Answer and see the solution →Nitrogen and oxygen are the main gases in air. Burning elements in oxygen produces different products and different observations.
(a)[2 marks]State the percentage by volume of nitrogen and oxygen in dry air.
(b)[2 marks]Describe an experiment using copper to determine the percentage of oxygen in air, including what you would observe during the experiment.
(c)[1 mark]Hydrogen burns in oxygen to form a product. Name the product and describe what you would see when hydrogen burns in oxygen.
Question 79
5 marks · Easy
Answer and see the solution →A student uses an experiment involving heated copper to determine the percentage of oxygen in a sample of air. She then compares the combustion of magnesium in air and in pure oxygen.
(a)The apparatus originally contains 80 cm³ of air. After the reaction with copper is complete and the apparatus has cooled, the remaining gas volume is 63 cm³.
(i)[1 mark]Calculate the volume of oxygen removed from the air.
(ii)[1 mark]Calculate the percentage of oxygen in the air sample. Show your working.
(b)[1 mark]Describe why it is important to use excess copper in this experiment.
(c)[2 marks]Magnesium burns in air to produce a white powder. Explain how the combustion of magnesium differs when it burns in pure oxygen instead of in air.
Question 80
6 marks · Normal
Answer and see the solution →This question is about the properties of different oxides and the impact of carbon dioxide in the atmosphere.
(a)[2 marks]When sulfur burns in oxygen, it produces an oxide. State whether the oxide formed is acidic or basic and explain your answer.
(b)[2 marks]When magnesium burns in oxygen, it forms magnesium oxide. Predict whether magnesium oxide reacts with acids or with alkalis and give a reason for your answer.
(c)[2 marks]State what is meant by the term 'greenhouse gas' and explain why carbon dioxide is classified as one.