The table shows the mass of carbon dioxide released for each kWh of electricity generated by four methods.
| Method of generating electricity | Mass of carbon dioxide released (g per kWh) |
|---|---|
| Coal-fired power station | 820 |
| Gas-fired power station | 490 |
| Gas-fired power station with carbon capture | 170 |
| Wind turbines | 11 |
A country is choosing a plan for generating all of its electricity.
Which plan would release the least carbon dioxide for each kWh generated?
60% wind turbines and 40% gas-fired power stations
80% wind turbines and 20% coal-fired power stations
50% wind turbines and 50% gas-fired power stations with carbon capture
100% gas-fired power stations with carbon capture
51 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.