PHA 327 - Exam 2 - Disperse Systems 6

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kyleannkelsey
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214933
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PHA 327 - Exam 2 - Disperse Systems 6
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2013-04-21 21:21:08
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PHA 327 Exam Disperse Systems
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PHA 327 - Exam 2 - Disperse Systems 6
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  1. What is the term for a dispersed phase of insoluble material in a dispersed medium?
    Suspension
  2. What is the term for a dispersed phase of an immiscible or insoluble liquid in a dispersion medium?
    Emulsion
  3. What is the term for a solution or emulsion that contains small air bubbles?
    Aerosol
  4. What is a dispersed system?
    Dispersed particles and a dispersed medium mixed together in two separate phases
  5. What is a suspension, as defined in this class?
    A dispersed phase of an insoluble solid in a dispersed medium
  6. What is an emulsion, as defined in this class?
    A dispersed phase of an insoluble/immiscible liquid in a dispersed medium
  7. What is an Aerosol, as defined in this class?
    A dispersed phase of small air bubbles in a solution or emulsion
  8. The categories: Molecular, Colloidal, Fine and Coarse all refer to what characteristic of dispersed systems?
    The particle size of the dispersed phase
  9. What sized particles are found in a Molecular?
    <0.001 um
  10. What is the term for a dispersed phase that contains particles that are <0.001 um?
    Molecular dispersion
  11. What sized particles are found in a Colloid dispersion?
    0.001-0.5 um
  12. What is the term for a dispersed phase that contains particles that are between 0.001 and 0.5 um?
    Colloid dispersion
  13. What sized particles are found in a Fine dispersion?
    0.5-10 um
  14. What is the term for a dispersed phase that contains particles that are between 0.5 and 10 um?
    Fine dispersion
  15. What sized particles are found in a Coarse dispersion?
    10-50 um
  16. What is the term for a dispersed phase that contains particles that are between 10 and 50 um?
    Coarse dispersion
  17. What type of dispersion system is a true solution?
    Molecular dispersion
  18. What type of Dispersed system is perfectly homogenous?
    Molecular dispersion
  19. What type of dispersed system is a heterogeneous system of at least two immiscible phases?
    • Colloid dispersion
    • (Fine dispersion and Coarse dispersion)
  20. Can you visualize molecularly dispersed particles with a microscope?
    No
  21. Can you visualize colloidally dispersed particles with a microscope?
    “No” (not with a normal microscope) only with an electron microscope
  22. Can you visualize a course dispersion with a microscope?
    Yes, and with the naked eye
  23. Can a Molecular dispersions pass through filter paper?
    Yes
  24. Can a Colloidal dispersion pass through a filter paper?
    Yes, though can be filtered out using ultra filtration
  25. Can a Coarse dispersion pass through a filter paper?
    No
  26. What three types of colloid dispersions exist?
    • Lyophilic Colloids (solvent loving)
    • Lyophobic Colloids (solvent hating)
    • Association Colloids
  27. How are colloid dispersion systems classified?
    By affinity of colloidal particles for the dispersion medium
  28. Describe a Lyophilic Colloid:
    • Attracted to the dispersion medium (Water/alcohol)
    • Hydrophilic

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