A recording studio is comparing two types of acoustic wall panel. Each type covers the same area and provides the same sound absorption.
| Recycled PET panel | Wood-fibre panel | |
|---|---|---|
| Mass of one panel (kg) | 3.0 | 5.0 |
| Energy used in manufacture (MJ/kg) | 28 | 19 |
| Carbon dioxide released at disposal (kg per panel) | 0.45 | 0.20 |
| Percentage recycled after use | 75% | 35% |
Which conclusion about the panels is consistent with all the data?
The wood-fibre panel needs less energy to manufacture and releases less carbon dioxide, but a smaller percentage is recycled.
The recycled PET panel needs less energy to manufacture and a larger percentage is recycled, but it releases more carbon dioxide.
The wood-fibre panel needs less energy to manufacture and releases less carbon dioxide, and a larger percentage is recycled.
The recycled PET panel needs less energy to manufacture and releases less carbon dioxide, and a larger percentage is 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.