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Polymers and crackingIB MYP Chemistry: Mind map

What this mind map covers

  • Cracking
  • Alkenes
  • Addition polymerisation
  • Common polymers
  • Plastic waste

Exam questions on Polymers and cracking

  1. An oil refinery in Rotterdam separates crude oil into fractions. It produces more long-chain hydrocarbons than customers need, and too few shorter molecules for petrol and for making plastics. To fix this, it heats the long-chain hydrocarbons so that they break into smaller molecules.
    State two conditions used for cracking.2 marks
  2. A student is shown a sample of poly(ethene) and is told that it is made from ethene, C₂H₄.
    Describe what happens to the ethene molecules during addition polymerisation.2 marks
  3. Propene, C₃H₆, is another alkene. Poly(propene) is used to make rope, food containers and school chairs.
    Name the monomer and the polymer in this process, and explain why it is called addition polymerisation.3 marks
See the full worksheet

Written by the Exaim team, led by Shaun Daswani (Head of Upper Secondary, Improve ME Institute; MSc Financial Mathematics, Imperial College London; BSc, UCL) and Jason Daswani (operational lead, Improve ME Institute; LSE).