The table shows part of a life cycle assessment for a glass drinks bottle and an aluminium drinks can. The values are the energy used at each stage for one container.
| Stage | Glass bottle in MJ | Aluminium can in MJ |
|---|---|---|
| obtaining raw materials | 2.0 | 3.5 |
| manufacture | 3.0 | 1.5 |
| transport during use | 1.5 | 0.5 |
| disposal | 0.5 | 0.5 |
The glass bottle can be washed and refilled. Each refill uses an extra 1.0 MJ. A can is used only once. A shop needs containers for five fillings of a drink.
Which conclusion is correct?
The can uses less energy than the bottle at every stage of its life cycle
For one filling the can uses less energy, but for five fillings the bottle uses less
The bottle uses less energy than the can for one filling and for five fillings
The can uses less energy for five fillings, because its transport energy is lower
45 exam-style questions on Edexcel GCSE Chemistry 5.1 Obtaining and using metals, covering 5.1.1 The reactivity series of metals, 5.1.2 Displacement reactions as redox reactions, 5.1.3 Extracting metals from ores by reduction, 5.1.4 Biological methods of metal extraction, 5.1.5 Resistance to oxidation and recycling metals, and 5.1.6 Life cycle assessment. Each one has a worked solution and a mark scheme showing where the marks go.