This exam tips covers Exam Tips: Polymers within Polymers for GCSE Chemistry. Revise Polymers in Organic Chemistry for GCSE Chemistry with 20 exam-style questions and 14 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 14 of 15 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Topic position
Section 14 of 15
Practice
20 questions
Recall
14 flashcards
💡 Exam Tips: Polymers
🎯 Common Question Types:
- Draw the polymer from a given monomer (3 marks)
- Identify the monomer from a polymer structure (1-2 marks)
- Compare addition and condensation polymerisation (3 marks HT)
- Evaluate methods of dealing with polymer waste (3-4 marks)
📝 Key Command Words:
- Draw: Show double → single, continuation lines, brackets + n
- Identify: Look for the repeating unit and add back the double bond
- Evaluate: Give advantages AND disadvantages of each method
⚠️ Common Mistakes to Avoid:
- Forgetting continuation lines outside the brackets
- Forgetting the n subscript after brackets
- Saying addition polymerisation releases water (it doesn't)
Quick Check: Draw the structure of the repeating unit of poly(propene), formed from propene (CH₃CH=CH₂).
The repeating unit is [-CH₂-CH(CH₃)-]ₙ. In a displayed formula: a chain of C-C single bonds, with one carbon bearing a CH₃ group. The brackets have continuation lines (bonds) going out from each end. The n subscript shows the unit repeats many times.
Quick Check: What is the key difference between addition and condensation polymerisation?
In addition polymerisation, alkene monomers join by opening their C=C double bonds — only the polymer is formed, no other product. In condensation polymerisation, monomers with two functional groups join together and release a small molecule (usually water) as a by-product each time two monomers join.