7. Organic Chemsitry (Paper 2)

Question 1

Carpets are made from:
•   poly(propene)
•   wool
•   a mixture of poly(propene) and wool.
Poly(propene) wears out more slowly than wool.
A mixture of poly(propene) and wool to make carpets is more sustainable than using just poly(propene) or just wool.
Suggest why.

Answer 1

any two from:
•   poly(propene) comes from a non-renewable source
allow poly(propene) will run out
•   poly(propene) requires a lot of energy to make
•   poly(propene) is not biodegradable
•   a wool carpet needs replacing more often
must refer to the carpet, not just the fibre
•   wool requires the use of large areas of land (which could be used to grow food crops)

Question 2

Starch, proteins and DNA are naturally occurring polymers.
A. Name the monomers from which starch and proteins are produced.
Starch ___________________________
Proteins __________________________

B. Describe the structure of DNA.

Answer 2

A. glucose
amino acids

B. any two from:
•   two polymer chains
•   double helix
•   four different monomers / nucleotides

Question 3

Compare the polymerisation reaction used to produce poly(ethene) with the polymerisation reaction used to produce a polyester.

Answer 3

any four from:
• poly(ethene) produced by addition polymerisation whereas polyester by condensation polymerisation
• poly(ethene) produced from one monomer wheareas polyester produced
from two different monomers
• poly(ethene) produced from ethene / alkene whereas polyester from a (di)carboxylic acid and a diol / alcohol
• poly(ethene) is the only product formed whereas polyester water also
produced
• poly(ethene) repeating unit is a hydrocarbon whereas polyester has an ester linkage