Liquid Crystalline State (Mesophase)
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Questions and Answers

Which statement best describes the Smectic liquid crystal state?

  • Random orientation of molecules
  • Molecules are free-flowing
  • Molecules arranged in layers with some order (correct)
  • Highly ordered molecules in all dimensions
  • What defines the Nematic liquid crystal state?

  • Highly ordered molecules
  • Threadlike structure (correct)
  • Random orientation of molecules
  • Parallel molecule arrangement
  • In which liquid crystal state do the molecules point along a common axis?

  • Nematic
  • Smectic
  • Mesophase
  • Cholesteric (correct)
  • What property makes liquid crystals unique compared to both liquids and solids?

    <p>Molecular mobility</p> Signup and view all the answers

    Which type of liquid crystal demonstrates polymorphism?

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

    What distinguishes liquid crystals as an intermediate state?

    <p>Fluidity similar to liquids and long-range order like solids</p> Signup and view all the answers

    How are cholesteric molecules aligned in a chiral nematic crystal?

    <p>At a slight angle to one another</p> Signup and view all the answers

    What leads to the formation of a structure in cholesteric liquid crystals?

    <p>Slight angle alignment of molecules</p> Signup and view all the answers

    How are nematic-like layers visualized in cholesteric crystals?

    <p>As helical layers</p> Signup and view all the answers

    What process can result in the formation of thermotropic liquid crystals?

    <p>Heating of solids</p> Signup and view all the answers

    Which component is involved in the formation of gall stones through the smectic mesophase?

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

    What characteristic of some liquid crystals allows them to detect areas of elevated temperature under the skin?

    <p>Consistent color changes with temperature</p> Signup and view all the answers

    What type of liquid crystalline phase is frequently present in emulsions and contributes to enhanced physical stability?

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

    Which type of liquid crystal phase is believed to have structures similar to those in cell membranes?

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

    What characteristics make supercritical fluids different from gases and liquids?

    <p>They effuse through solids like a liquid</p> Signup and view all the answers

    What property is absent in supercritical fluids due to the lack of a liquid/gas phase boundary?

    <p>High surface tension</p> Signup and view all the answers

    Which type of liquid crystal displays a twisted structure, leading to unique optical properties?

    <p>Cholesteric liquid crystals</p> Signup and view all the answers

    At what condition does a supercritical fluid not convert into a liquid under pressure change but dissolves materials like a liquid?

    <p>$T &gt; T_{critical}$</p> Signup and view all the answers

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