A sheet of thermosoftening polymer is warmed and bent around a cable to form a guide. The guide is later reheated and given a different shape.
Which model of the polymer's structure is supported by this observation?
It consists of small molecules held together by weak forces.
Cooling forms permanent cross-links between neighbouring chains.
It has separate, tangled chains with only weak forces between them.
Heating converts each polymer chain back into its monomers.
118 exam-style questions on AQA GCSE Chemistry 10.3 Using materials, covering 10.3.1 Corrosion and its prevention, 10.3.2 Alloys as useful materials, and 10.3.3 Ceramics, polymers and composites. Each one has a worked solution and a mark scheme showing where the marks go.