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Term for technques for separating, analyzinng, & identifying compounds
Chromatography
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Ferrocene structure
iron atom sandwiched b/w 2 cyclopentadienyl atoms
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ferrocene reacts w/ ___ to form acetylferrocene
acetic anhydride & phosphoric acid
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Gas or liquid phase
mobile phase
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solid support that contains an absorbent
stationary phase
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areas of concentration of compoenents of sample mixture
bands
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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
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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)
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solvent that is used for the mobile phase
eluent
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___ 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
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During column chromatography, do polar or nonpolar compounds elute first?
Nonpolar
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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
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Chalcone experiment demonstrates what type of synthesis rxn?
Aldol condensation then dehydration to form conjugated, alpha,beta-unsaturated ketone
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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.
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Qualitative analysis is useful b/c?
Utilizes diff reactivities of various functional groups w/reagents that give color chg, precipitate, etc
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Besides qualititative test, what else is used to identy the original unknown?
Making derivatives
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Tollens test tests for ___ and positive test is:
aldehydes, silver mirror
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Schiff test tests for ___ and positive test is:
aldehydes, magenta color (lt pink is negative)
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Iodoform test tests for ___ and positive test is:
methyl ketones; yellow precipitate
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