A life cycle assessment is used to compare detergent P and detergent Q.
Under the same washing conditions, 40 cm³ of P or 25 cm³ of Q is needed for one full load of laundry.
A student compares the environmental impacts of 400 cm³ of P with 250 cm³ of Q.
Why is the student's method fair?
Each amount avoids impacts requiring value judgements.
Each amount contains the same mass of raw materials.
Each amount has the same impact during manufacture.
Each amount washes ten full loads of laundry.
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.