IGCSE Chemistry 0620/42/F/M/21 Q6

Question

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6 Polymers are large molecules built up from small molecules.
(a) State the name given to the small molecules from which polymers are made.
……………………………………………………………………………………………………………………………. [1]

(b) The formula of a polymer is shown.
n
C
CH3
C
CH3
H H

(i) Draw the structure of the small molecule from which this polymer is made. Show all of the atoms and all of the bonds.
[2]

(ii) State the type of polymerisation used to make this polymer.
……………………………………………………………………………………………………………………… [1]

(c) Three amino acids are shown. They combine to form part of a natural polymer.
H2N COOH H2N COOH H2N COOH
(i) Name the type of natural polymer formed when amino acids combine.
……………………………………………………………………………………………………………………… [1]

(ii) Complete the diagram to show part of the structure of the natural polymer that forms when these three amino acids combine. Show all of the bonds in the linkages.
[3]

iii) Name the type of chemical reaction that takes place when this natural polymer is converted back to amino acids.
……………………………………………………………………………………………………………………… [1]

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Answer ( 1 )

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    2022-07-05T14:01:55+08:00

    (c)(iii) Condensation is a process of combining monomers and removing (producing by-products of) water molecules. Hydrolysis is the process of adding water molecules to return the combined units back into monomers.

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