The table shows some life-cycle assessment data for two shirts.
| Stage | Cotton shirt | Polyester shirt |
|---|---|---|
| Water used to obtain raw materials (dm3\mathrm{dm^{3}}dm3) | 2700 | 20 |
| Crude oil used as a raw material (kg) | 0 | 1.2 |
| Energy used in manufacture (MJ) | 55 | 125 |
| Energy used for washing and drying, per year (MJ) | 40 | 25 |
| Disposal | biodegradable | not biodegradable |
Which conclusion is supported by the data?
The polyester shirt uses less energy in total than the cotton shirt over 2 years of use.
The cotton shirt has a lower environmental impact than the polyester shirt at every stage.
The cotton shirt uses less energy in total over 2 years of use, but much more water is used to obtain its raw materials.
The cotton shirt uses no finite resources at any stage, because no crude oil is used as a raw material.
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.