A manufacturer makes aluminium panels for laboratory equipment. It compares one batch made using new aluminium with one batch made using returned aluminium printing plates.
The total energy includes obtaining or collecting the aluminium, processing it and making the panels.
| Production route | Mass of panels produced (tonnes) | Total energy used (GJ) |
|---|---|---|
| New aluminium extracted by electrolysis | 2.0 | 480 |
| Aluminium recycled from returned printing plates | 4.0 | 120 |
The energy used to make 1 tonne of panels by the recycling route is what percentage of the energy used to make 1 tonne of panels by the electrolysis route?
25%
87.5%
50%
12.5%
136 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.