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CIE iGCSE Co-Ordinated Science C11.7 Polymers Exam Style Questions Paper 1

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Question

Which statement describes poly(ethene)?

A. It is formed from monomer molecules which each contain two atoms.
B. It is formed from a saturated hydrocarbon monomer.
C. It is formed in an addition reaction.
D. It is a polymer consisting of C, H and O atoms.

▶️ Answer/Explanation
Poly(ethene) is formed from ethene monomers in an addition polymerisation reaction. Ethene is an unsaturated hydrocarbon, and poly(ethene) consists only of carbon and hydrogen atoms (no oxygen).
✅ Answer: (C)

Question

Which statement about addition polymerisation is correct?

A. Large monomer units join to form small polymer molecules.
B. Large polymer molecules join to form small monomer units.
C. Small monomer units join to form large polymer molecules.
D. Small polymer molecules join to form large monomer units.

▶️ Answer/Explanation
A polymer is, by definition, a very large molecule built from many smaller repeating units called monomers.
In addition polymerisation, small monomer molecules (such as ethene) join together with no other product formed.
This joining produces one large polymer chain, e.g. poly(ethene), from the many small monomers.
✅ Answer: (C)

Question

Poly(ethene) is made from ethene by addition polymerisation.

Which word describes ethene in this process?

A. fuel
B. catalyst
C. monomer
D. solvent

▶️ Answer/Explanation
Addition polymerisation joins many small, identical molecules together into one long chain.
These small repeating units that join together are called monomers.
Here, ethene molecules are the monomers that link to form poly(ethene).
✅ Answer: (C)

Question

Polymers are …..1….. chain molecules. They are formed when …..2….. join together. Which words complete gaps 1 and 2?

▶️ Answer/Explanation
Polymers are long chain molecules made by joining together many small repeating units called monomers. Alkanes are a type of hydrocarbon, not the building blocks of polymers. Therefore, the correct words are long and monomers.
✅ Answer: (B)

Question

Which statement about poly(ethene) is correct?

A. It always contains less than 12 carbon atoms.
B. It is formed from ethane.
C. It is formed from ethene.
D. It occurs naturally.

▶️ Answer/Explanation
Poly(ethene) is an addition polymer made by joining together many ethene monomer molecules.
It is a synthetic (man-made) plastic and does not occur naturally, and its long polymer chains contain far more than 12 carbon atoms.
Since it is formed by polymerising ethene (not ethane), the correct statement is that it is formed from ethene.
✅ Answer: (C)
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