Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Gases in the Atmosphere
86 practice questions
Topics covered
Practice questions
21–30 of 36 · Normal
Question 21
1 mark · Normal
Answer and check →Which statement about metal oxides is correct?
- A.They are always acidic.
- B.They are usually basic.
- C.They are usually neutral.
- D.They react with water to form acidic solutions.
Question 22
2 marks · Normal
Answer and see the solution →Hydrogen burns in oxygen to form water. State whether water is an acidic, basic, or neutral oxide and give a reason for your answer.
Question 23
4 marks · Normal
Answer and see the solution →Sulfur burns in air to form sulfur dioxide.
(a)[1 mark]Write a balanced equation for the reaction of sulfur with oxygen.
(b)[1 mark]State whether sulfur dioxide is acidic, basic or neutral.
(c)[2 marks]Explain your answer to (b).
Question 24
3 marks · Normal
Answer and see the solution →When 4.8 g of magnesium is completely burned in excess oxygen, magnesium oxide (MgO) is formed. Magnesium oxide is then added to water, and only a small amount dissolves to form an alkaline solution.
Use the equation below and the information given to answer the following questions.
(Relative atomic masses: Mg = 24, O = 16)
(a)[3 marks]Calculate the maximum mass of magnesium oxide (MgO) produced when all of the 4.8 g of magnesium reacts. Show your working.
Question 25
2 marks · Normal
Answer and see the solution →State two environmental effects that rising levels of carbon dioxide in the atmosphere may cause.
Question 26
4 marks · Normal
Answer and see the solution →When magnesium carbonate is heated strongly, it decomposes.
(a)[1 mark]Write a balanced chemical equation for the thermal decomposition of magnesium carbonate.
(b)[1 mark]Name the type of reaction taking place.
(c)[2 marks]Describe what would be observed when magnesium carbonate is heated in a test tube.
Question 27
3 marks · Normal
Answer and see the solution →A student heats potassium carbonate in a test tube and observes no visible change. Use your knowledge of the thermal decomposition of metal carbonates to explain this result.
Question 28
4 marks · Normal
Answer and see the solution →The table shows estimated global carbon dioxide (CO2) levels and average surface temperatures at two different years:
Year CO2 concentration / ppm Average temperature / °C 1850 285 13.6 2020 415 14.9 (a)[1 mark]Describe the trend shown by the data.
(b)[1 mark]Suggest a possible link between the CO2 levels and average surface temperature.
(c)[2 marks]Explain one environmental consequence of this link.
Question 29
1 mark · Normal
Answer and check →Which of the following is a balanced equation for the thermal decomposition of calcium carbonate?
- A.
- B.
- C.
- D.
Question 30
2 marks · Normal
Answer and see the solution →Explain why carbon dioxide is described as a greenhouse gas.