A manufacturer makes a 500 kg batch of aluminium window-frame sections. The manufacturer is considering changing from the current route to a planned route.
The remainder of the aluminium in each batch is new aluminium extracted from ore.
| Quantity | Current route | Planned route |
|---|---|---|
| Recycled aluminium in the batch | 30% | 70% |
| Additional energy for collecting and sorting | 600 MJ | 1000 MJ |
| Process | Energy needed |
|---|---|
| Extracting and processing new aluminium | 160 MJ/kg |
| Reprocessing recycled aluminium | 8 MJ/kg |
Calculate the decrease in the mass of new aluminium needed for each batch if the planned route is used.
Give one effect of this change on the reserves of aluminium ore.
Calculate how much less total energy is needed for the planned route than for the current route.
99 exam-style questions on AQA GCSE Chemistry 10.2 Life cycle assessment and recycling, covering 10.2.1 Life cycle assessment and 10.2.2 Ways of reducing the use of resources. Each one has a worked solution and a mark scheme showing where the marks go.