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28 Cards in this Set
- Front
- Back
Acetanilide lab-
Which chemicals should one be especially careful with |
aniline
acetic anhydride hydrochloric acid |
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crude acetanilide should have a ______ melting point and a ________ percent yield then the purified acetanilide.
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lower melting point
higher percent yield |
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Which of the following equipment is needed for a vacuum filtration
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filter flask
filter adapters Buchner or Hirsch funnel filter paper thick walled tubing |
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If you started with .05moles of aniline and made 6.75g of acetanilide, what is your percent yield?
MW of Acetanilide = 135 g/mole |
100%
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In today’s laboratory you will be separating an acid and a base. One can calculate
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weight percent recovery
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a) In this experiment Mixture A contains both benzoic acid and p-nitroaniline. The base is ________________.
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p-nitroaniline
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When extracting the methylene chloride (dichloromethane) solution with 25ml of 6M HCl, the procedure says to drain the aqueous extract into an Erlenmeyer. The aqueous layer is
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hydrochloric acid
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When extracting the methylene chloride (dichloromethane) solution with 25ml of 6M HCl, the procedure says to drain the aqueous extract into an Erlenmeyer. Which layer will be on the top?
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the aqueous layer
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Theorectically, which type of distillation should give better separation of the two compounds
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fractional distillation
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Which two unknowns will be separated by distillation today
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ketone and alkane
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In the IR of an alkane, there should be no presence of
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A carbonyl absorption around 1710cm-1
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In order to identify the unknown compounds in the distillation lab, in addition to IR, we will use
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boiling point
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The Rf value of a compound is defined as
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The distance traveled by the substance/the distance traveled by the solvent front.
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In the first part of the chromatography experiment we will be separating the following compounds
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fluorene
fluorenol fluorenone |
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When one monitors a reaction by thin-layer chromatography one knows that the reaction is complete when TLC shows
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the appearance of a spot for product and the disappearance of a spot for
starting material |
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Thin Layer Chromatography can be used to
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- follow the extent of reaction
- suggest the purity of a compound |
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What is the primary difference between TLC and column chromatography
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The moving phase in column chromatography travels downward, whereas in TLC the solvent ascends the plate
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Which two compounds in today’s experiment will be separated from column chromotograhy?
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Fluorene and Fluorenone
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The adsorbent on the column in the chromotography experiment will be
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Alumina
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Fluorene will elute off the column with a
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non polar solvent
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Another name for t-Pentyl Chloride is
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2-chloro-2-methylbutane
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If one starts with .05 moles of t-pentyl alcohol, what is the theoretical yield of t-pentyl chloride. (Note: the molecular weight of t-pentyl chloride is 106 grams/mole)
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5.3g
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What absorption will not be present in the IR spectrum of t-pentyl chloride that would be present in the starting material t-pentyl alcohol?
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alcohol
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The synthesis of t-pentyl chloride from t-pentyl alcohol is an
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SN1 reaction
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The Infrared Spectrum of S-(+)-Carvone and R-(-)-Carvone is?
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exactly the same
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R-(-)-Carvone and S-(+)-Carvone are
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- non-superimposable mirror images
- enantiomers |
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Speific Rotation is defined by the equation
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alpha observed/(c)(l)
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Which method will differentiate between the two enantiomeric carvones
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polarimetry
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