9.3 Polymers

• Polymerization is the process by which monomers join to form polymers.

  True
• Match the type of polymerization with its description:

  Addition polymerization ↔️ Monomers add directly without losing atoms

  Condensation polymerization ↔️ Monomers join with elimination of a small molecule
• Addition polymerization typically occurs with saturated monomers.

  False
• What type of small molecule is commonly eliminated during condensation polymerization?

  Water
• Polymers can only form linear chains.

  False
• Condensation polymerization involves the elimination of a small molecule
• What are the end products of condensation polymerization?

  Polymer and byproduct
• Thermoplastics have a highly cross-linked molecular structure.

  False
• Thermoplastics can be melted and re-molded multiple times.

  True
• Thermoplastics have a highly cross-linked molecular structure.

  False
• Thermosets undergo an irreversible chemical change when heated
• Can thermosets be recycled?

  No
• Condensation polymerization involves the elimination of a small molecule.

  True
• Match the term with its definition:

  Polymer ↔️ Large molecule formed from repeating units

  Monomer ↔️ Repeating unit of a polymer

  Polymerization ↔️ Process of forming polymers
• Condensation polymerization requires monomers with at least two reactive groups.


  True
• What happens to thermoplastics when heated?

  They soften
• What is the primary difference between addition and condensation polymerization?

  Elimination of small molecule
• Condensation polymerization involves the elimination of a small molecule, such as water.


  True
• In condensation polymerization, the end products include the polymer and a small molecule byproduct
• What are the two main types of polymers based on their properties?

  Thermoplastics and thermosets
• Match the polymer type with an example:

  Thermoplastic ↔️ Polyethylene

  Thermoset ↔️ Epoxy resin
• Thermosets undergo an irreversible chemical change when heated
• Thermosets often end up in landfills as they cannot be easily recycled.
• What are polymers made of?

  Monomers
• Polymers can be classified based on their properties
• What are the two primary types of polymerization?

  Addition and condensation
• Condensation polymerization requires monomers with two reactive groups
• Order the steps in condensation polymerization:

  1️⃣ Monomers join together

  2️⃣ A small molecule is eliminated

  3️⃣ A polymer is formed
• What type of monomers are required for addition polymerization?

  Unsaturated monomers
• The polymer structure in addition polymerization is always three-dimensional.

  False
• Match the type of polymer with its property:

  Thermoplastics ↔️ Soften when heated

  Thermosets ↔️ Cannot be re-molded
• What happens to thermosets when heated?

  Irreversible chemical change
• Examples of thermoplastics include polyethylene, polypropylene, and polystyrene
• What are the two main categories of polymers based on their properties?

  Thermoplastics and thermosets
• What happens to thermoplastics when heated?

  Soften and can be re-molded
• What are the two main types of polymerization?

  Addition and condensation
• Addition polymerization forms long, linear chain polymers
• What type of monomers are used in addition polymerization?

  Unsaturated monomers
• In condensation polymerization, a small molecule such as water is eliminated
• Thermosets cannot be re-melted once they are formed.


  True