Addition Polymers
Explain addition polymerisation and translate accurately among an unsaturated monomer, repeating unit and polymer structure.
How to study National 5 Chemistry
Move between particle explanations, formulae, calculations, experimental evidence and justified conclusions, while using official materials for exact written-paper and assignment practice.
Core concepts
Concept 1
Addition polymerisation joins many small unsaturated monomers to form a long-chain polymer.
Exam cue: Open the monomer C=C bond and show continuation bonds through the repeating unit.
Concept 2
The name of an addition polymer derives from its monomer, and the repeating unit is the shortest chain section that reproduces the polymer.
Exam cue: Keep every substituent attached to the same carbon when moving between representations.
Concept 3
A polymer structure can be drawn from a monomer or repeating unit, and the monomer can be recovered conceptually from the polymer structure.
Exam cue: Restore the double bond when identifying the alkene monomer from a repeating unit.
Risk pitfalls and guardrails
Leaving a carbon–carbon double bond inside an addition-polymer repeating unit.
Guardrail: Check formulae, charges, units, state or experimental conditions before committing to the final conclusion.
Dropping or moving a substituent when drawing the polymer.
Guardrail: Check formulae, charges, units, state or experimental conditions before committing to the final conclusion.
Treating the repeating unit as a complete short molecule with capped ends.
Guardrail: Check formulae, charges, units, state or experimental conditions before committing to the final conclusion.
Memory anchors
Polymer
A polymer is a long-chain molecule made from many small monomers.
Addition polymerisation
Unsaturated monomers join without eliminating a small molecule.
Repeating unit
The repeating unit is the shortest chain section that reproduces the polymer.
Polymer name
An addition polymer is named from the monomer used to make it.
Monomer to polymer
Open C=C, preserve substituents and show chain continuation bonds.
Polymer to monomer
Isolate the repeating-unit carbons and restore their C=C bond.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
What is a polymer?
What is a monomer?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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