SACE Chemistry — Stage 2
Polymers — Flashcards & Quiz
Polymers are large molecules built from repeating monomer units, and SACE Chemistry Stage 2 distinguishes addition polymerisation (alkene monomers join via opening the C=C double bond) from condensation polymerisation (monomers join with loss of a small molecule, usually water). You need to explain how polymer structure determines physical properties and biodegradability, and draw representative repeat units.
Sample Flashcards
Q1: What is addition polymerisation?
Addition polymerisation occurs when many unsaturated monomer molecules (containing C=C bonds) join together by opening their double bonds. No atoms are lost — all monomer atoms appear in the polymer. The polymer has the same empirical formula as the monomer.
Q2: How does condensation polymerisation differ from addition polymerisation?
Condensation polymerisation joins monomers by removing a small molecule (usually H₂O) at each linkage. Monomers must have TWO functional groups (difunctional). The polymer has a different empirical formula from the monomer. Examples: polyesters (from diacid + diol) and polyamides/nylon (from diacid + diamine).
Sample Quiz Questions
Q1: Addition polymerisation produces a small molecule such as water as a by-product.
Answer: FALSE
Addition polymerisation does NOT produce any by-products — all monomer atoms are incorporated into the polymer chain. It is condensation polymerisation that releases a small molecule.
Q2: Nylon is a condensation polymer formed from a dicarboxylic acid and a diamine.
Answer: TRUE
Nylon (polyamide) is formed by condensation of a dicarboxylic acid and a diamine. Each amide bond (-CONH-) formation releases one water molecule.
Last updated: March 2026 · 2 flashcards · 2 quiz questions