A town collects four materials for recycling.
| Material | Mass collected per year (tonnes) | Energy to make 1 tonne from raw materials (GJ) | Energy to make 1 tonne from recycled material (GJ) |
|---|---|---|---|
| Aluminium | 10 | 200 | 10 |
| Glass | 500 | 15 | 10 |
| Paper | 300 | 30 | 22 |
| Steel | 200 | 25 | 12 |
Recycling which material saves the most energy in total each year?
Aluminium
Glass
Paper
Steel
61 exam-style questions on OCR GCSE Chemistry 6.1 Improving processes and products, covering 6.1.1 Extracting metals industrially and by electrolysis, 6.1.2 Life cycle assessment and recycling, 6.1.3 Biological methods of metal extraction, 6.1.4 The Haber process and the production of fertilisers, 6.1.5 Alloys and their uses, 6.1.6 Corrosion and its prevention, 6.1.7 Comparing and selecting materials, and 6.1.8 Industrial conditions, rate and position of equilibrium. Each one has a worked solution and a mark scheme showing where the marks go.