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Quiz Chapter 4: Polymer Chemistry

10 questions · Form 5 Chemistry Bab 4: Polymer Chemistry

Question 1 of 10Score: 0

What structural feature prevents thermosetting plastics from melting upon heating?

Full Question List & Answer Key

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

1. What structural feature prevents thermosetting plastics from melting upon heating?

  1. Long unbranched linear polymer chains
  2. Weak van der Waals forces between molecules
  3. Covalent cross-links bonding polymer chains into a rigid 3D network
  4. Presence of repeating ester linkages
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Answer: C

Strong covalent cross-links hold polymer chains firmly together in a 3D network, preventing the plastic from melting when heated.

2. Which type of polymer can be repeatedly melted upon heating and remoulded without undergoing chemical decomposition?

  1. Thermosetting plastic
  2. Elastomer
  3. Thermoplastic
  4. Synthetic rubber
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Answer: C

Thermoplastics have linear or branched chains with weak intermolecular forces, allowing them to melt upon heating and be remoulded repeatedly.

3. 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.

4. 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.

5. 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.

6. Terylene is a synthetic polyester. Which two functional groups react together to form a polyester link?

  1. Carboxyl group (-COOH) and Hydroxyl group (-OH)
  2. Carboxyl group (-COOH) and Amino group (-NH₂)
  3. Hydroxyl group (-OH) and Amino group (-NH₂)
  4. Ester group (-COO-) and Carbonyl group (C=O)
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Answer: A

Polyesters are formed when dicarboxylic acids containing -COOH groups react with diols containing -OH groups.

7. What is the systematic IUPAC name for the monomer of natural rubber?

  1. 2-methylprop-1-ene
  2. 2-methylbuta-1,3-diene
  3. Buta-1,3-diene
  4. Chloroethene
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Answer: B

The monomer of natural rubber (isoprene) has the systematic IUPAC name 2-methylbuta-1,3-diene.

8. Why does adding ethanoic acid cause latex to coagulate?

  1. Ethanoic acid dissolves the natural rubber polymer chains
  2. Hydrogen ions (H⁺) neutralise negative charges on the protein membrane surrounding rubber particles
  3. Ethanoic acid reacts with sulfur to form cross-links
  4. Hydroxide ions (OH⁻) neutralise positive charges on the protein membrane
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Answer: B

Ethanoic acid releases H⁺ ions that neutralise the negative charges on the protein membrane, allowing rubber particles to collide, rupture, and coagulate.

9. 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.

10. 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)
Show answer

Answer: C

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

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