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 shows up very often in GCSE exams, so students should be able to explain it clearly, not just recognise the term. 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.
💡 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.
Practice questions for Polymers
What type of monomers are needed for addition polymerisation?
Explain how addition polymerisation works. Include the role of the double bond.