Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Gases in the Atmosphere
86 practice questions
Topics covered
Practice questions
61–70 of 86
Question 61
3 marks · Easy
Answer and see the solution →Below is a table showing average yearly global CO2 concentrations for three years:
Average global CO2 concentrations Year CO2 concentration (ppm) 2000 370 2010 390 2020 415 (a)[1 mark]Describe the trend shown by the data.
(b)[1 mark]Calculate the average increase in CO2 concentration per decade over the period 2000–2020.
(c)[1 mark]State one possible environmental consequence of this trend.
Question 62
1 mark · Easy
Answer and see the solution →Name the gas that is produced when calcium carbonate is heated strongly in the laboratory.
Question 63
3 marks · Easy
Answer and see the solution →The greenhouse effect is important for life on Earth.
(a)[1 mark]Explain what is meant by the term 'greenhouse gas'.
(b)[1 mark]State why carbon dioxide, but not nitrogen, is a greenhouse gas.
(c)[1 mark]Give one way in which human activities have increased the amount of carbon dioxide in the atmosphere.
Question 64
2 marks · Easy
Answer and see the solution →A student heats 1.2 g of magnesium carbonate (ce{MgCO3}) and all of it decomposes. Calculate the maximum mass of carbon dioxide gas that can be produced. (Relative atomic masses: Mg = 24, C = 12, O = 16)
Question 65
2 marks · Normal
Answer and see the solution →State two environmental effects that rising levels of carbon dioxide in the atmosphere may cause.
Question 66
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 67
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 68
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 69
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 70
2 marks · Normal
Answer and see the solution →Explain why carbon dioxide is described as a greenhouse gas.