A leisure centre replaces its fossil-fuel heating system with one that burns pellets made from a fast-growing crop.
The supplier claims that using the pellets adds no carbon dioxide to the atmosphere.
The table gives data for the crop material needed to make one tonne of pellets.
| Process | Effect on the mass of carbon dioxide in the atmosphere |
|---|---|
| Growth of the crop | 1840 kg removed |
| Burning the pellets | 1780 kg released |
| Using fossil fuels to grow, process and transport the pellets | 145 kg released |
Evaluate the supplier's claim. Use the data in the table.
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.