CH 13: Polymers  and Plastics: An In-depth Analysis

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Questions and Answers

What are polymers made up of?

  • Inorganic compounds
  • Random arrangements of molecules
  • Atomic particles
  • Repeating structural units called monomers (correct)

Which of the following is an example of a natural polymer?

  • DNA (correct)
  • Nylon
  • Polyethylene
  • PVC

Which type of polymer can be melted and reshaped multiple times?

  • Thermoset polymers
  • Both thermoplastic and thermoset polymers
  • Neither thermoplastic nor thermoset polymers
  • Thermoplastic polymers (correct)

What prevents the molecules in thermoset polymers from sliding past each other?

<p>Cross-links (B)</p> Signup and view all the answers

Which of the following is a characteristic of thermoplastic polymers?

<p>They can be remolded (B)</p> Signup and view all the answers

What is the process of forming polymers called?

<p>Polymerization (D)</p> Signup and view all the answers

Which of the following is an example of a synthetic polymer?

<p>Polyethylene (A)</p> Signup and view all the answers

What type of bond connects the monomers in a polymer chain?

<p>Covalent bond (D)</p> Signup and view all the answers

Which of the following polymers is commonly used in packaging?

<p>Polyethylene (C)</p> Signup and view all the answers

What is the main difference between thermoplastic and thermoset polymers?

<p>Thermoplastic polymers can be remolded, while thermoset polymers cannot (C)</p> Signup and view all the answers

Which type of polymer is used to make bakelite and melamine?

<p>Condensation polymers (B)</p> Signup and view all the answers

What is the main difference between addition and condensation polymerization?

<p>Addition polymerization involves double or triple bonds, while condensation polymerization involves two functional groups. (A)</p> Signup and view all the answers

How do the length and branching of polymer chains affect their physical properties?

<p>Longer and more branched chains increase strength and melting point. (C)</p> Signup and view all the answers

Which of the following is not a major environmental concern associated with the widespread use of plastics?

<p>Excessive energy consumption during production (A)</p> Signup and view all the answers

What is the main advantage of biodegradable plastics made from renewable resources like corn starch?

<p>They can be broken down by microbes, reducing environmental impact. (D)</p> Signup and view all the answers

What is the primary purpose of the polymer slime experiment mentioned in the text?

<p>To demonstrate the viscoelastic properties of polymers. (A)</p> Signup and view all the answers

Which of the following statements about the environmental impact of plastics is false?

<p>Recycling efforts are straightforward and easy to implement for all types of plastics. (B)</p> Signup and view all the answers

What is the main reason for the widespread use of polymers and plastics in modern life?

<p>They offer versatile and cost-effective solutions across various sectors. (B)</p> Signup and view all the answers

Which of the following properties of polymers is determined by their intermolecular forces?

<p>Flexibility and melting points of the polymers (A)</p> Signup and view all the answers

How do addition polymerization and condensation polymerization differ?

<p>Addition polymerization involves monomers combining with the loss of small molecules, while condensation polymerization involves monomers adding to each other without losing any atom. (B)</p> Signup and view all the answers

Which factor contributes to increasing the strength and rigidity of polymers?

<p>Cross-linking between polymer chains (C)</p> Signup and view all the answers

What is the primary environmental concern associated with non-biodegradable polymers?

<p>Their inability to break down easily (D)</p> Signup and view all the answers

Which type of polymers are known for their viscoelastic properties?

<p>Thermoplastic polymers (B)</p> Signup and view all the answers

What distinguishes biodegradable plastics made from corn starch from conventional synthetic polymers?

<p>They can be broken down by microbes (D)</p> Signup and view all the answers

How do the length and branching of polymer chains affect their melting points?

<p>Increased length and branching lead to higher melting points (B)</p> Signup and view all the answers

What is the impact of intermolecular forces on polymer flexibility?

<p>Weak intermolecular forces decrease flexibility (A)</p> Signup and view all the answers

Which process results in polymers like polyesters and nylons?

<p>Condensation polymerization (D)</p> Signup and view all the answers

What distinguishes thermoplastic polymers from thermoset polymers?

<p>Thermoplastic polymers can be melted and reshaped multiple times, while thermoset polymers remain rigid once set. (B)</p> Signup and view all the answers

What differentiates addition polymerization from condensation polymerization in terms of monomer structures?

<p>Addition polymerization uses monomers with two functional groups, while condensation polymerization involves monomers with double or triple bonds. (B)</p> Signup and view all the answers

What is the main structural difference between thermoplastic and thermoset polymers?

<p>Thermoplastic polymers consist of linear chains, while thermoset polymers have cross-linked chains. (A)</p> Signup and view all the answers

Which of the following statements about monomers is true?

<p>Monomers are the repeating structural units that form polymers. (A)</p> Signup and view all the answers

What is the primary reason for the widespread use of polymers and plastics in modern society?

<p>Their low cost and versatility in various applications. (C)</p> Signup and view all the answers

Which of the following is a characteristic of thermoplastic polymers?

<p>They can be softened by heating and hardened by cooling repeatedly. (A)</p> Signup and view all the answers

Which of the following statements about polymer formation is correct?

<p>Polymerization is the process of joining monomers together to form polymer chains. (D)</p> Signup and view all the answers

What is the primary environmental concern associated with the widespread use of plastics?

<p>The non-biodegradability and accumulation of plastic waste in the environment. (D)</p> Signup and view all the answers

Which of the following is an example of a natural polymer?

<p>DNA (C)</p> Signup and view all the answers

What type of bond connects the monomers in a polymer chain?

<p>Covalent bond (D)</p> Signup and view all the answers

Which of the following statements about polymer properties is true?

<p>Longer polymer chains generally have higher melting points and tensile strengths. (D)</p> Signup and view all the answers

Which of the following is a characteristic of thermoset polymers?

<p>They have cross-links that prevent their molecules from sliding past each other. (D)</p> Signup and view all the answers

What type of polymers are bakelite and melamine examples of?

<p>Thermoset polymers (C)</p> Signup and view all the answers

How do the length and branching of polymer chains affect their physical properties?

<p>Longer and more branched chains increase strength and melting point (B)</p> Signup and view all the answers

What is the main difference between addition polymerization and condensation polymerization?

<p>Condensation polymerization involves the loss of small molecules, while addition polymerization does not (B)</p> Signup and view all the answers

How do intermolecular forces affect the flexibility and melting points of polymers?

<p>Stronger intermolecular forces decrease flexibility and increase melting points (B)</p> Signup and view all the answers

What is the primary environmental concern associated with the widespread use of non-biodegradable plastics?

<p>Waste disposal problems due to the non-biodegradability of synthetic polymers (B)</p> Signup and view all the answers

What is the main advantage of biodegradable plastics made from renewable resources like corn starch?

<p>They can be broken down by microbes, reducing environmental impact (A)</p> Signup and view all the answers

Which of the following statements about the formation of polymers is correct?

<p>Monomers with double or triple bonds add to each other without losing any atoms in condensation polymerization (A)</p> Signup and view all the answers

How does cross-linking between polymer chains affect their properties?

<p>Cross-linking increases the strength and rigidity of polymers (B)</p> Signup and view all the answers

What is the primary reason for the widespread use of polymers and plastics in modern society?

<p>They offer versatile and customizable properties for various applications (C)</p> Signup and view all the answers

Which of the following polymers is an example of a natural polymer?

<p>Cellulose (D)</p> Signup and view all the answers

Which of the following statements accurately describes the relationship between monomers and polymers?

<p>Polymers are macromolecules composed of repeating monomer units linked by covalent bonds. (C)</p> Signup and view all the answers

What is the primary structural difference between thermoplastic and thermoset polymers that determines their ability to be remolded?

<p>Thermoset polymers have cross-links that prevent their molecules from sliding past each other, while thermoplastic polymers lack such cross-links. (B)</p> Signup and view all the answers

Which of the following statements accurately describes the impact of polymer chain length and branching on their physical properties?

<p>Longer polymer chains with fewer branches generally result in higher melting points and increased rigidity. (B)</p> Signup and view all the answers

Which of the following is the primary environmental concern associated with the widespread use of non-biodegradable polymers and plastics?

<p>Accumulation of non-biodegradable waste in landfills and the environment. (B)</p> Signup and view all the answers

Which of the following statements correctly describes the advantage of biodegradable plastics made from renewable resources like corn starch?

<p>They can decompose naturally in the environment, reducing the accumulation of non-biodegradable waste. (D)</p> Signup and view all the answers

Which of the following statements accurately describes the role of intermolecular forces in determining polymer properties?

<p>Stronger intermolecular forces lead to higher melting points and increased rigidity in polymers. (C)</p> Signup and view all the answers

Which of the following statements accurately describes the main reason for the widespread use of polymers and plastics in modern society?

<p>Their versatility, durability, and cost-effectiveness for a wide range of applications. (A)</p> Signup and view all the answers

Which of the following statements is false regarding the environmental impact of plastics?

<p>The manufacturing processes for plastics have no significant impact on greenhouse gas emissions. (B)</p> Signup and view all the answers

Which of the following polymerization processes results in polymers like polyesters and nylons?

<p>Condensation polymerization (B)</p> Signup and view all the answers

Which of the following statements accurately describes the difference between addition polymerization and condensation polymerization in terms of monomer structures?

<p>Addition polymerization involves monomers with the same functional groups, while condensation polymerization involves monomers with different functional groups. (B)</p> Signup and view all the answers

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