Who this is for: Cambridge IGCSE Coordinated Science (0654) students who want polymers — monomers, polymerisation types and everyday examples — to become a reliable source of marks instead of a vocabulary list.
What query it owns: how to understand and revise polymers in Cambridge IGCSE Coordinated Science.
Why this is safe: this page owns the polymers revision-guide angle, while Tutopiya’s Polymers subtopic page owns the learning resource and the free Polymers quiz owns the practice.

Polymers are large molecules built from many small monomer units joined together. Cambridge IGCSE Coordinated Science (0654) expects you to distinguish addition and condensation polymerisation, identify natural polymers such as proteins and starch, and explain how monomers link to form long chains. This guide links each concept to the question types that appear in past papers.

Key takeaways

• A polymer is a large molecule made of many repeating monomer units.
• Addition polymerisation joins unsaturated monomers (e.g. alkenes) with no other product formed.
• Condensation polymerisation joins monomers with the loss of a small molecule (often H₂O).
• Natural polymers include proteins, starch and cellulose.
• Plastics are synthetic polymers; many are non-biodegradable.

What are polymers in Cambridge IGCSE Coordinated Science?

Polymers are macromolecules — their name means “many parts.” Monomers link through covalent bonds during polymerisation. Addition polymerisation uses alkene monomers: the C=C double bond opens and monomers join in a chain. Condensation polymerisation involves two different functional groups on monomers; each link releases a small molecule such as water. Natural polymers play vital roles in living organisms.

You can read the full explanation, diagrams and notes on Tutopiya’s Polymers subtopic page before you attempt questions.

Addition vs condensation polymerisation

Type	Monomers	What happens	Small molecule lost?	Example
Addition	Alkenes (C=C)	Double bond opens; monomers add on	No	Poly(ethene) from ethene
Condensation	Molecules with two functional groups	Monomers link by forming new bonds	Yes (often H₂O)	Proteins, nylon, terylene

Natural polymers you must know

Polymer	Monomer / building block	Role
Proteins	Amino acids	Enzymes, structural proteins
Starch	Glucose units	Energy storage in plants
Cellulose	Glucose units (different link)	Plant cell walls

Polymers in past-paper wording: command words that matter

Command word / phrase	What the question wants	Typical polymer stem
Define	Give precise meaning	”Define the term polymer.”
State the monomer	Name starting molecule	”State the monomer used to make poly(ethene).”
Explain	Link process to outcome	”Explain how addition polymerisation differs from condensation polymerisation.”
Give an example	Name a polymer and use	”Give an example of a natural polymer.”

Worked exam-style stems (how to answer the wording)

1. “Define the term monomer.” A small molecule that joins with others to form a polymer. Mark-scheme reward: small molecule + joins to form polymer.
2. “State the monomer used to make poly(ethene).” Ethene. Reward: correct alkene name.
3. “Give two examples of natural polymers.” Proteins and starch (or cellulose). Reward: any two valid natural polymers.

Test yourself with the Polymers quiz once you can distinguish addition from condensation polymerisation.

How polymers connect to the rest of Coordinated Science chemistry

Polymers build on Alkenes — ethene is the key addition-polymerisation monomer. They lead into Synthetic Polymers and link to Biological Molecules. The Cambridge IGCSE Coordinated Science resource hub links every Organic Chemistry subtopic.

Common mistakes students make

• Confusing monomer (small unit) with polymer (large molecule).
• Saying all polymerisation releases water (only condensation does).
• Forgetting that addition polymerisation uses alkene monomers with C=C bonds.
• Listing poly(ethene) as a natural polymer (it is synthetic).
• Not stating that proteins are polymers of amino acids.

When you need more support

If polymer questions keep costing marks, work through the Polymers quiz, then get focused help from a Cambridge IGCSE Coordinated Science tutor.

Frequently asked questions

Is polymers hard in Coordinated Science? The core ideas — monomer, polymer, addition vs condensation — are straightforward once you learn one example of each type.

What is the difference between addition and condensation polymerisation? Addition joins alkene monomers with no small molecule lost; condensation joins monomers and releases a small molecule such as water.

What are examples of natural polymers? Proteins, starch and cellulose — all found in living organisms.

How do I revise polymers effectively? Learn one addition example (ethene → poly(ethene)), one condensation example, and three natural polymers, then take the Polymers quiz.

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