Addition polymers and polymer disposalEdexcel A-Level Chemistry: Mind map

Exam questions on Addition polymers and polymer disposal

1. Poly(chloroethene), commonly called PVC, is an addition polymer used to make window frames and drainpipes.
   A sample of PVC has a relative molecular mass of 125 000. Calculate the number of repeat units in each polymer chain. (Ar: H = 1.0, C = 12.0, Cl = 35.5)2 marks
2. A packaging company makes crates from poly(propene). A section of the polymer chain is drawn as –CH₂–CH(CH₃)–CH₂–CH(CH₃)–CH₂–CH(CH₃)–.
   Waste poly(propene) crates are burned in an incinerator with plenty of air. Write a balanced equation for the complete combustion of poly(propene), using C₃H₆ for the repeat unit, and state one advantage of incineration.2 marks
3. A waste-treatment company incinerates mixed plastic waste, which includes poly(chloroethene), PVC, in order to generate electricity.
   Name the toxic gas formed when the PVC is burned that is not formed when poly(propene) is burned, and explain why it forms. Describe how the gas can be removed from the waste gases.3 marks