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Addition Polymerisation (chemistry Only) (GCSE Chemistry)

The following is a GCSE Chemistry test covering 'Addition Polymerisation (chemistry Only)' from the broader topic Organic Chemistry. The test is geared towards the AQA exam board style syllabus.
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Which statement best summarises why addition polymers can be engineered for many uses?
Why are addition polymers like poly(ethene) described as `addition` polymers (rather than condensation)?
Which of these best explains why increasing the monomer concentration speeds up free-radical addition polymerisation?
Which method best recovers monomer or useful feedstock from mixed addition-polymer waste by breaking long chains chemically?
What is the correct stoichiometric relationship when 100 monomer C=C units join to give a polymer chain?
Why do some synthetic addition polymers require stabilisers or UV absorbers in outdoor applications?
What is a main advantage of producing polymers from renewable monomers (e.g., plant-derived ethene) rather than fossil fuels?
Why does high-density poly(ethene) (HDPE) have higher tensile strength than low-density poly(ethene) (LDPE)?
Which addition polymer contains chlorine atoms on every repeat unit and is used for pipes and window frames?
Which test result would confirm an alkene monomer was present before polymerisation?
Which statement about poly(ethene) and poly(propene) is correct?