Damaged plastic storage crates are mixed with other types of plastic at a recycling centre. The crate plastic will be melted to make new crates. Why should the crate plastic be separated from the other plastics before melting?
Sorting by type removes surface dirt and reduces the need to wash the crates.
Other plastics could contaminate the melt and alter the properties of the new crates.
Other plastics would stop the recycled crates from conserving finite crude oil.
Sorting by type reduces the fuel needed to collect and transport the crates.
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.