Orgo Lab Quiz 2

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bkheath
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113557
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Orgo Lab Quiz 2
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2011-10-31 23:11:51
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Orgo Lab Quiz
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Orgo Lab Quiz 2
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  1. Term for technques for separating, analyzinng, & identifying compounds
    Chromatography
  2. Ferrocene structure
    iron atom sandwiched b/w 2 cyclopentadienyl atoms
  3. ferrocene reacts w/ ___ to form acetylferrocene
    acetic anhydride & phosphoric acid
  4. Gas or liquid phase
    mobile phase
  5. solid support that contains an absorbent
    stationary phase
  6. areas of concentration of compoenents of sample mixture
    bands
  7. If a component has a greater affinity for the ___ phase, it will travel more slowly. If greater affinity for the ___ phase, it will travel more quickly through the ____ phase more quickly.
    • stationary phase
    • mobile, stationary
  8. why is silica gel a good stationary phase?
    inorganic solid which has many sites for hydrogen bonding, therefore, polar copounds tend to stick to the stationary phase (polar doesn't travel as far)
  9. solvent that is used for the mobile phase
    eluent
  10. ___ compounds interact more strongly with the stationary phase, so they travel a ___ distance up the plate. ___ compounds travel faster through the stationary phase, so they travel a ___ distance up the plate. Which has Rf value closer to 1?
    • Polar; shorter
    • Nonpolar, longer
    • Nonpolar have Rf values closer to 1
  11. During column chromatography, do polar or nonpolar compounds elute first?
    Nonpolar
  12. Why is important not to dilute the initial samplel before it's been loaded onto the chromatography column?
    So that the entire sample enters the column in as compact a band as possible
  13. Chalcone experiment demonstrates what type of synthesis rxn?
    Aldol condensation then dehydration to form conjugated, alpha,beta-unsaturated ketone
  14. What was ammonium formate used for in chalcone experiment?
    As a source of hydrogen during transfer hydrogenation. When it decomposes in presence of Pd/C, it releases H2 which is used for reduction.
  15. Qualitative analysis is useful b/c?
    Utilizes diff reactivities of various functional groups w/reagents that give color chg, precipitate, etc
  16. Besides qualititative test, what else is used to identy the original unknown?
    Making derivatives
  17. Tollens test tests for ___ and positive test is:
    aldehydes, silver mirror
  18. Schiff test tests for ___ and positive test is:
    aldehydes, magenta color (lt pink is negative)
  19. Iodoform test tests for ___ and positive test is:
    methyl ketones; yellow precipitate

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