A canteen is comparing reusable stainless steel spoons with single-use polypropylene spoons.
The table gives the manufacturing and use-stage data for each type of spoon.
| Type of spoon | Mass of one spoon in g | Energy needed to manufacture the material in MJ/kg | Number of uses for each spoon | Energy used to wash one spoon after each use in MJ |
|---|---|---|---|---|
| Stainless steel | 35 | 55 | 200 | 0.015 |
| Polypropylene | 4.0 | 75 | 1 | 0 |
The canteen provides a spoon for each of 200 meals. The stainless steel spoon is washed after every use, including after the final use.
Calculate the total energy shown in the table for each type of spoon over the 200 meals.
State which type of spoon uses less energy over the 200 meals.
99 exam-style questions on AQA GCSE Chemistry 10.2 Life cycle assessment and recycling, covering 10.2.1 Life cycle assessment and 10.2.2 Ways of reducing the use of resources. Each one has a worked solution and a mark scheme showing where the marks go.