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Polymers (GCSE Chemistry)

The following is a GCSE Chemistry test covering 'Polymers' from the broader topic Bonding, Structure, And The Properties Of Matter. The test is geared towards the AQA exam board style syllabus.
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Why does adding plasticiser to a polymer like PVC make it more flexible?
Polymers that soften and can be reshaped on heating and cooling are called:
Which of the following is an environmental advantage of recycling polymers by mechanical reprocessing?
Which polymer feature most directly increases elasticity in elastomers like rubber?
How does copolymerisation allow tuning of polymer properties?
Which statement about condensation polymers is correct?
Why do thermosetting plastics not melt when heated?
How does branching in polymer chains typically affect the material compared with a linear polymer of similar molecular weight?
Why are some polymers semi-crystalline while others are largely amorphous?
What makes a polymer biodegradable?
Which test best distinguishes between an addition polymer such as poly(ethene) and a condensation polymer such as a polyester?