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6.3 Interpreting and interacting with earth systems

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Question 12

A cold-storage depot currently generates 2.4 × 106 kWh of electricity each year using an oil-fired generator.

The generator releases 0.74 kg of carbon dioxide per kWh\mathrm{kWh}kWh of electricity generated while operating.

The depot plans to replace the oil-fired generator with the following system.

Method of generating electricityElectricity generated each year in kWh\mathrm{kWh}kWhCarbon dioxide released while operating in kg\mathrm{kg}kg per kWh\mathrm{kWh}kWh
Wind turbine1.5 × 1060
Gas-fired generator0.9 × 1060.41
a.

Calculate the decrease in the mass of carbon dioxide released each year while generating electricity.

Give your answer in kg\mathrm{kg}kg.

[3]
b.

Explain how this decrease in carbon dioxide emissions could affect the global average temperature.

[2]
Markscheme

6.3 Interpreting and interacting with earth systems Questions

  1. GCSE
  2. /Chemistry
  3. /6.3 Interpreting and interacting with earth systems

109 exam-style questions on OCR GCSE Chemistry 6.3 Interpreting and interacting with earth systems, covering 6.3.1 Formation and evolution of the atmosphere, 6.3.2 The greenhouse effect and climate change, 6.3.3 Sources and problems of atmospheric pollutants, and 6.3.4 Producing potable water. Each one has a worked solution and a mark scheme showing where the marks go.

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