Chemistry Year 11 - Module 1 - Lesson 11
Polymers: Structure and Properties
1. Key Ideas
Think of polymer chains like trains. A monomer is a single train carriage. Polymerisation is coupling thousands of carriages end-to-end. The type of carriage (monomer structure) and how they connect determines everything — from the flexibility of a shopping bag to the strength of a bulletproof vest. Understanding polymer structure is a direct application of the bonding and IMF principles you've already built up.
- The difference between monomers and polymers
- How monomer structure determines polymer properties
2. Success Criteria
By the end, you should be able to:
- The difference between monomers and polymers
- Addition and condensation polymerisation
- Common polymers and their uses (polyethylene, PVC, nylon, polyester)
3. Key Terms
4. Activity: Build the Lesson Map
Use the lesson to complete the table. Keep answers brief but specific.
| Prompt | Your answer |
|---|---|
| Main concept | |
| Important example | |
| Common mistake to avoid | |
| How this links to the next lesson |
5. Short Answer Questions
1. 6. Compare addition and condensation polymerisation. In your answer, describe the monomer requirements, the mechanism, and the products (including any byproducts) for each. Provide one named example of each type.
2. 7. LDPE (low-density polyethylene) is used for flexible shopping bags while HDPE (high-density polyethylene) is used for rigid pipes. Both are made from the same monomer (ethylene). Explain how the difference in chain structure leads to these different applications.
3. 8. Nylon-6,6 has a higher melting point (265°C) than polyethylene (~130°C for HDPE), despite both being addition-type synthetic polymers. Explain the molecular basis for this difference, referencing IMF types.
6. Extend: Apply the Idea
A student gives a memorised answer about Polymers: Structure and Properties but does not use evidence or reasoning.
Improve the answer by writing a stronger response that uses accurate terminology, a relevant example and a clear explanation.
7. Multiple Choice
1. What is the best first step when answering a question about Polymers: Structure and Properties?
A. Identify the key concept being tested
B. Write every fact from memory
C. Ignore the command word
D. Skip examples and evidence
2. Which answer would show stronger understanding of Polymers: Structure and Properties?
A. An answer with accurate terms and reasoning
B. A copied definition only
C. A single-word response
D. An answer with no example
3. What should you do if a question asks you to explain?
A. Link the idea to a reason or cause
B. List unrelated facts
C. Only draw a diagram
D. Write the shortest possible answer
8. Success Criteria Proof
Finish with evidence that you can do each success criterion.