The table shows some life-cycle assessment data for two types of shopping bag.
| Paper bag | Poly(ethene) bag | |
|---|---|---|
| Energy used to make one bag (MJ) | 1.7 | 0.6 |
| Water used to make one bag (dm3\mathrm{dm^{3}}dm3) | 3.1 | 0.2 |
| Time to break down in landfill | about 1 month | about 500 years |
Which conclusion is supported by the data?
The paper bag has a lower environmental impact at every stage of its life.
The poly(ethene) bag has a lower environmental impact at every stage of its life.
The paper bag uses less energy to make, but it uses more water to make.
The poly(ethene) bag uses less energy and water, but takes longer to break down.
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.