Crystalline Solids and Unit Cells Quiz
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Questions and Answers

What is the repeating unit in a crystalline solid known as?

  • Unit cell (correct)
  • Atomic stack
  • Polymer segment
  • Molecular arrangement
  • In polymer crystals, what are the unit cells made up of?

  • Single atoms
  • Molecular segments (correct)
  • Metallic structures
  • Secondary bonding
  • How many atoms can be present in a unit cell of a polymer chain depending on its complexity?

  • Tens
  • Single
  • Dozens
  • Hundreds (correct)
  • Which type of polymers are mainly non-crystalline?

    <p>Atactic polymers</p> Signup and view all the answers

    What holds the polymer segments together within crystals?

    <p>Hydrogen bonding</p> Signup and view all the answers

    Which factor plays a crucial role in determining the extent of crystallization and crystal structure in polymers?

    <p>Tacticity</p> Signup and view all the answers

    What does the ratio of Mw/Mn indicate about a polymer specimen?

    <p>The range of molecular sizes</p> Signup and view all the answers

    What is the significance of having a Mw/Mn ratio equal to 1.00?

    <p>Indicates a monodisperse polymer</p> Signup and view all the answers

    What is the Z-average Molar Mass (Mz) primarily quoted for?

    <p>Polymers with higher molar mass averages</p> Signup and view all the answers

    In copolymerization, what characterizes Alternating Copolymers?

    <p>Two different types of repeat units</p> Signup and view all the answers

    What distinguishes Block Copolymers from other copolymer types?

    <p>Existence of long sequences or blocks of the same type</p> Signup and view all the answers

    How would one define a copolymer based on the text provided?

    <p>A polymer derived from multiple monomers</p> Signup and view all the answers

    What is the definition of the weight fraction Wi?

    <p>The mass of molecules of molar mass Mi divided by the total mass of all the molecules present</p> Signup and view all the answers

    Why is the weight-average molar mass Mw used rather than Mn for polymeric materials?

    <p>Mw is sensitive to the presence of high Mi species</p> Signup and view all the answers

    What is the formula for calculating Mn in terms of weight fraction?

    <p>(1/ΣWi) * Mi</p> Signup and view all the answers

    Which term dominates the behavior in polymeric materials when considering Mw?

    <p>High Mi species</p> Signup and view all the answers

    In the given blend example, what are the molar masses of C95H192 and C105H212 molecules?

    <p>1332 g/mol and 1472 g/mol</p> Signup and view all the answers

    If a 2g specimen contains 1g each of C95H192 and C105H212, what are Mn and Mw in this case?

    <p>Mn = 1399 g/mol, Mw = 1402 g/mol</p> Signup and view all the answers

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