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9.2 Earth and atmospheric science

9.2 Earth and atmospheric science

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Question 5
F

A family's gas boiler burns methane.

CH4+2O2→CO2+2H2O\mathrm{CH_{4}} + \mathrm{2O_{2}} \rightarrow \mathrm{CO_{2}} + \mathrm{2H_{2}O}CH4​+2O2​→CO2​+2H2​O

In one year the boiler burns 800 kg of methane.

a.

Explain how burning methane increases the greenhouse effect.

[2]
b.

Calculate the mass of carbon dioxide produced when 800 kg of methane burns. Relative atomic masses: C = 12, H = 1, O = 16

[3]
c.

The family replace the gas boiler with an electric heat pump. This saves 1800 kg of carbon dioxide each year. Calculate the percentage of the carbon dioxide from the boiler that is saved. Give your answer to 2 significant figures.

[2]
d.

Suggest one reason why using the heat pump does not reduce the family's carbon dioxide emissions from heating to zero.

[1]
e.

Burning methane produces another greenhouse gas as well as carbon dioxide. Name this gas.

[1]
Markscheme

9.2 Earth and atmospheric science Questions

  1. GCSE
  2. /Chemistry
  3. /9.2 Earth and atmospheric science

97 exam-style questions on Edexcel GCSE Chemistry 9.2 Earth and atmospheric science, covering 9.2.1 The Earth's early atmosphere, 9.2.2 How the atmosphere evolved, 9.2.3 Chemical test for oxygen, and 9.2.4 The greenhouse effect and climate change. Each one has a worked solution and a mark scheme showing where the marks go.

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