Polyesters
polyamides
polypeptides
Addition polymers
Amino acids
Know that amino acids contain the -COOH and –NH2 functional groups
Explain why amino acids are amphoteric
Know that amino acids have a chiral centre and be able to identify this
CARE: Glycine is the exception
Represent amino acids as zwitterions, showing all charges
Know the meaning of the term ‘isoelectric point’
Show zwitterion structures in both low and high pH’s
Know that addition polymerisation requires a C=C
Be able to draw and name repeating units and addition polymers from a
given monomer (and visa versa)
Explain why addition polymers are unreactive and will not decolourise
bromine water
Describe the key differences in formation between addition polymers
and condensation polymers
Show how a dipeptide is formed from two amino acids in a condensation
reaction, identifying the amide link, -CONHShow how polypeptides are formed from many amino acids
Discuss the role of Hydrogen bonds in maintaining polymer shape
Show how polypeptides can be hydrolysed in acidic conditions (link
to the digestion of protein in the stomach)
Know that polypeptides can be hydrolysed in alkali conditions to
produce a carboxylate salt
Know that a polyamide requires a carboxylic acid (-COOH) and amino (NH2) group to form the amide link (-CONH-)
Show how nylon-6,6 and kevlar are formed from dicarboxylic acids
and diamines
Write equations for the hydrolysis of a polyamide with water and
acid to produce a dicarboxylic acid and diamine
Discuss the similarities and differences between polypeptides and
polyamides
Know that a polyester requires a carboxylic acid (-COOH) and hydroxyl
(-OH) group to form the ester link (-COO-)
Show how Terylene is formed from a dicarboxylic acid and diol
Write equations for the hydrolysis of a polyester with an alkali e.g.
NaOH to produce a dicarboxylic acid salt and diol
Know that polyesters are photodegradable due to the C=O bond
Discuss advantages and disadvantages of methods of polymer disposal
Explain why some polymers are biodegradable
Exam ques
Revised
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Covered
AMINO ACIDS AND POLYMERS
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A2 Chemistry – Unit 4