Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Gases in the Atmosphere
86 practice questions
Topics covered
Practice questions
31–36 of 36 · Normal
Question 31
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 32
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 33
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.
Question 34
7 marks · Normal
Answer and see the solution →This question is about the reactions and environmental impact of oxides and carbon dioxide.
(a)[3 marks]Describe what happens when copper(II) carbonate is heated strongly in a test tube, include the name and properties (acidic or basic) of the solid product.
(b)[1 mark]Write a balanced chemical equation for the thermal decomposition of copper(II) carbonate.
(c)[3 marks]Explain how the carbon dioxide gas formed from this reaction can contribute to global warming.
Question 35
6 marks · Normal
Answer and see the solution →This question is about the nature of oxides and the greenhouse effect.
(a)[2 marks]Magnesium and sulfur are burned separately in oxygen. State the type of oxide each element forms (acidic or basic) and explain your choice for each.
(b)Carbon dioxide is released by burning fossil fuels and contributes to the greenhouse effect.
(i)[2 marks]Describe how an increase in atmospheric carbon dioxide can affect global temperatures, according to the greenhouse effect.
(ii)[2 marks]Calculate the mass of CO₂ formed when 5.0 g of calcium carbonate are completely decomposed by heating. (Relative atomic masses: Ca = 40, C = 12, O = 16)
Question 36
6 marks · Normal
Answer and see the solution →This question is about the properties of oxides and the production of carbon dioxide from metal carbonates.
(a)[2 marks]Copper(II) carbonate is a green solid. When it is heated, a black solid and a gas are formed.
State the type of oxide produced and give one property that supports your answer.
(b)[1 mark]Write a chemical equation for the thermal decomposition of copper(II) carbonate, using symbols.
(c)[1 mark]The gas produced in this reaction is released to the atmosphere. Describe one environmental effect of increased carbon dioxide levels.
(d)[2 marks]Calcium oxide formed from heating calcium carbonate is placed in water.
What is the nature of the solution formed and how does it relate to the type of oxide?