State that plastics are made from polymers

What are Polymers?

Polymers are huge molecules made from many repeating units called monomers. Think of them as a long necklace of beads. 🧬

Each bead could be a small molecule like ethylene, \$C2H4\$. When many beads link together, they form a chain:

\$\text{Polymer} = \bigl[(CH2-CH2)\bigr]_n\$

Here, \$n\$ is the number of repeating units. The more beads, the longer the chain and the stronger the material.

Plastics Are Made from Polymers

🧪 Plastics are everyday materials like bottles, bags, and toys. They are all made from polymers that can be melted and reshaped. This is why you can see plastic being melted in factories to make new shapes.

Example: Polyethylene terephthalate (PET) is a polymer used for water bottles. Its monomers are ethylene glycol and terephthalic acid.

Remember: Plastics = Polymers + Processing.

Common Polymer Types

Exam Tip: How to Answer Questions About Plastics

1. State that plastics are made from polymers.
2. Give an example of a polymer used in everyday plastic (e.g., PET).
3. Write a simple polymerisation reaction:

   \$\text{Monomer} + \text{Monomer} \xrightarrow{\text{Heat/Initiator}} \text{Polymer}\$

4. Explain one property that makes polymers useful (e.g., flexibility, durability).

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Remember to use clear, concise language and include at least one example.

Quick Review: Polymer Analogy

Think of a polymer like a long train made of identical cars (monomers). The more cars you add, the longer the train. If you want a different shape, you can cut the train and reassemble it – that’s like melting a thermoplastic and moulding it into a new object.

💡 Tip: Use the train analogy when explaining polymer chains to classmates.