A hotel is choosing between two refrigerators with the same internal volume. The life-cycle data are for eight years of use.
| Life-cycle data | Refrigerator A | Refrigerator B |
|---|---|---|
| Energy used in manufacture (MJ) | 4400 | 6500 |
| Energy used each year (MJ) | 900 | 520 |
| Mass of metals obtained from finite ores (kg) | 38 | 42 |
| Percentage by mass recycled at disposal (%) | 70 | 85 |
Which conclusion is supported by the data?
Refrigerator B uses less energy in total, uses a smaller mass of metals obtained from finite ores and has a higher percentage recycled.
Refrigerator B uses less energy in total and has a higher percentage recycled, but uses a greater mass of metals obtained from finite ores.
Refrigerator A uses less energy in total and uses a smaller mass of metals obtained from finite ores.
Refrigerator B uses more energy in total and uses a greater mass of metals obtained from finite ores, but has a higher percentage recycled.
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.