Form Six Mock Kilimanjaro Joint Exam 2026| Download
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(a) Define the following terms:
(i) Biopolymer
(ii) Elastomer
(iii) Step-growth polymer
(iv) Chain-growth polymer
(b) (i) High density polyethylene polymer is used in manufacturing of plastic containers
and bottle for storing and keeping food and drinks for human consumptions why?
(ii) Particularly strong and rigid polyester used for electronics parts is marketed under
the trade name glyptal. It is a polymer of terephthalic acid and glycerol. Draw a segment
of the polymer and explain why it is so strong?
(iii) Bakelite, a durable plastic used for the casing of early radio and TVs was the first of
the thermosetting polymer. It is highly cross-linked polymer formed from the acidcatalyzed polymerization of phenol and formaldehyde. Because it is much darker than
melmac, Bakelite's range of colors is limited. Propose a structure of Bakelite.
(iv) Thermosetting polymer after they are hardened, they cannot be remelted by heating
why?
(c) (i) Nylon66 is the polyamide formed from intermolecular combination of two
monomers which are adipoyl chloride and 1,6-hexanediamine, give structural formula of
the two monomers.
(ii) Explain by three points why the two molecules are suitable for step-growth
polymerization?
(iii) Give the structure of polymer formed from condensation of two monomers named in
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