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Quiz Chapter 4: Polymer Chemistry

10 questions · Form 5 Chemistry Bab 4: Polymer Chemistry

10 questions · plays in fullscreen

Full Question List & Answer Key

Prefer reading to quizzing? All 10 questions are listed below with the answer and explanation under each one.

1. Which monomer is used to produce polystyrene?

  1. Ethene
  2. Propene
  3. Phenylethene (Styrene)
  4. Tetrafluoroethene
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Answer: C

Polystyrene is synthesized through the addition polymerisation of phenylethene, commonly called styrene.

2. Compared to unvulcanised natural rubber, vulcanised rubber is:

  1. More soft and sticky when exposed to heat
  2. Less elastic and degrades faster in air
  3. More resistant to oxidation, heat, and stretching forces
  4. Soluble in dilute acid solutions
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Answer: C

Sulfur cross-links make vulcanised rubber harder, more elastic, more resistant to heat, and less susceptible to atmospheric oxidation.

3. What hazardous toxic gas is released when Polyvinyl chloride (PVC) waste is incinerated?

  1. Methane gas (CH₄)
  2. Hydrogen chloride gas (HCl)
  3. Ammonia gas (NH₃)
  4. Sulfur trioxide gas (SO₃)
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Answer: B

PVC contains chlorine atoms; burning PVC releases toxic, corrosive hydrogen chloride (HCl) gas.

4. Condensation polymerisation usually results in the formation of a polymer alongside which small molecule byproduct?

  1. Carbon dioxide
  2. Water or Hydrogen chloride
  3. Methane
  4. Sulfur dioxide
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Answer: B

Condensation polymerisation eliminates small molecules such as water (H₂O) or hydrogen chloride (HCl) as byproducts.

5. Which of the following synthetic polymers is a polyamide?

  1. Terylene
  2. Nylon
  3. Perspex
  4. Polypropene
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Answer: B

Nylon is a polyamide formed through condensation polymerisation between dicarboxylic acids and diamines.

6. What functional group must be present in monomer molecules to undergo addition polymerisation?

  1. Hydroxyl group (-OH)
  2. Carboxyl group (-COOH)
  3. Carbon-carbon double bond (C=C)
  4. Amino group (-NH₂)
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Answer: C

Addition polymerisation requires monomers with unsaturated carbon-carbon double bonds (C=C).

7. Which element is added to natural rubber during vulcanisation to form cross-links between polymer chains?

  1. Carbon
  2. Sulfur
  3. Nitrogen
  4. Chlorine
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Answer: B

Vulcanisation involves heating natural rubber with sulfur atoms, which form cross-links between adjacent polymer chains.

8. Why does unvulcanised natural rubber degrade quickly when exposed to ozone gas or sunlight?

  1. It contains weak single bonds between carbon and hydrogen
  2. It contains unsaturated carbon-carbon double bonds (C=C) that react easily with oxygen and ozone
  3. It contains sulfur cross-links that break under sunlight
  4. It absorbs moisture from the atmosphere rapidly
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Answer: B

The presence of C=C double bonds in natural rubber makes it chemically active and sensitive to oxidation by ozone or oxygen.

9. Which chemical substance is added to latex to prevent premature natural coagulation during transport?

  1. Methanoic acid
  2. Ethanol
  3. Aqueous ammonia
  4. Sodium chloride solution
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Answer: C

Aqueous ammonia supplies OH⁻ ions that neutralise any H⁺ ions produced by bacterial action, preserving negative charges on the membranes to prevent coagulation.

10. Which of the following is a naturally occurring polymer?

  1. Polythene
  2. Polyvinyl chloride
  3. Protein
  4. Nylon
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Answer: C

Protein is a natural polymer made up of amino acid monomers. Polythene, PVC, and Nylon are synthetic polymers.

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