A cleaning company compares two types of floor-cleaning pad using a life cycle assessment. Each pad is disposed of in landfill after the stated number of equal-sized floor areas has been cleaned.
The environmental impacts of using and transporting the pads are the same.
| Pad | Number of floor areas cleaned by one pad | Manufacturing energy for one pad in MJ | Mass of one pad sent to landfill in g |
|---|---|---|---|
| P | 15 | 0.60 | 12 |
| Q | 40 | 1.40 | 40 |
Calculate the manufacturing energy needed when each type of pad is used to clean 120 floor areas.
Evaluate which pad has the lower environmental impact from manufacture and disposal when 120 floor areas are cleaned.
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.