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Practice · Chemistry · 2025 syllabus · S2.4

IB Chemistry S2.4 From models to materials: practice questions

6 exam-style questions on S2.4 From models to materials, SL and HL, 2 marked HL: 3 multiple choice and 3 structured. Each one comes with the mark scheme, a model answer and the reasoning behind every mark. Free with your email.

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S2.4-01 · Paper 1A style · multiple choice · 1 mark

Monomer of an addition polymer

Part of an addition polymer chain:
–CH2–CH(CN)–CH2–CH(CN)–CH2–CH(CN)–
Which monomer was polymerized to give this chain? [1]

  1. CH3CH2CN
  2. CH2=CHCN
  3. NC–CH=CH–CN
  4. CH2=C(CN)2
Show the answer and the reasoning

Answer: B. B is correct. The repeating unit is –CH2–CH(CN)–, two carbons long. Putting back the C=C double bond that opened during addition polymerization gives CH2=CHCN. A has no C=C, so it cannot undergo addition polymerization. C would put a CN group on every carbon of the chain. D would put two CN groups on alternate carbons.

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The 6 questions in S2.4

  1. S2.4-01 Monomer of an addition polymerPaper 1A style · multiple choice · 1 mark
  2. S2.4-02 Monomers for a condensation polymerPaper 1A style · multiple choice · 1 mark · HL
  3. S2.4-03 Why alloys are harderPaper 1A style · multiple choice · 1 mark
  4. S2.4-04 Monomers of a polyamidePaper 2 style · structured question · 5 marks · HL
  5. S2.4-05 An addition polymer and its disposalPaper 2 style · structured question · 3 marks
  6. S2.4-06 Using the bonding trianglePaper 2 style · structured question · 4 marks

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Every Biology and Chemistry question here is original, written for practice in the style of the papers set since the 2025 syllabus, with invented data. Developed independently from the International Baccalaureate Organization, which has not endorsed it. Found a mistake? Email vytis@limeadmissions.com with the question id.