Edexcel IAL Chemistry 19.8 condensation and addition polymerisation

An answer that makes reference to the following points:

- (polymer is a very) large molecule

OR (polymer is formed from) large number of / many monomers

(1)

- (condensation as) splitting off of a (small) molecule (1)

Allow long-chain (molecule) Allow macromolecule Allow repeating for many Ignore 2 or more / several / different for many Ignore (formed by) addition

Allow with loss/elimination of $\mathrm{H}_{2} \mathrm{O} / \mathrm{HCl}$ Ignore forms byproduct

(2)

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An answer that makes reference to the following points:

- structure of hexanedioyl dichloride

- structure of hexane-1,6-diamine

Accept monomers in either order

Allow any combination of skeletal, structural or displayed formulae If more than one type of formula shown, all must be correct

Penalise errors in chain length once only

Ignore connectivity in structural formulae eg Allow $\mathrm{COClCH}_{2} \ldots / \mathrm{COOHCH}_{2} \ldots / \mathrm{NH}_{2} \mathrm{CH}_{2} \ldots$ eg Allow $\mathrm{C}=\mathrm{OCl}-\mathrm{CH}_{2} \ldots / \mathrm{C}=\mathrm{OOH}-\mathrm{CH}_{2} \ldots / \mathrm{NH}_{2}-\mathrm{CH}_{2} \ldots$

Penalise connectivity in skeletal / displayed formulae once only

Allow structure of hexanedioic acid

Examples of correct structures:

$\mathrm{ClOCCH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{COCl} / \mathrm{ClOC}\left(\mathrm{CH}_{2}\right)_{4} \mathrm{COCl}$$\mathrm{HOOCCH} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{COOH} / \mathrm{HOOC}\left(\mathrm{CH}_{2}\right)_{4} \mathrm{COOH}$

(2)

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