• Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off
Reading...
Front

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key

image

Play button

image

Play button

image

Progress

1/30

Click to flip

30 Cards in this Set

  • Front
  • Back
What is VSEPR?
a. It is used to predict hybridization of an atom
b. It is used to predict geometry of a molecule
c. Valence Shell Electron Pair Repulsion
d. all of above
All the above
The developing solvent in TLC is
a. 50% ethyl acetate and 50% hexane
b. 95% acetone and 5% hexane
c. 95% ethanol
d. 50% ethanol and 50% water
50% ethyl acetate and 50% hexane
What is the hybridization of the nitrogen atom in ammonia (NH3)?
a. sp3
b. sp2
c. sp
d. p
sp3
What does a broad melting range indicates?
a. That my compound is pure c. That my compound is water soluble
b. That my compound is impure
d. None of the above
Impure compound
Which compound has an angle of 180o between two bonds?
a. H2O
c. NH3
b. CO2
d. CH4
CO2
What is the purpose of a TLC?
a. identify an unknown
b. determine the color of the compound
c. calculate the Rf
d. a and c
-Calculate the Rf
-Identify an unknown
When you increase the temperature very quickly to measure the melting point of your compound, you will get
a melting point which is
a. narrow enough and higher than what is expected
b. narrow enough and lower than what is expected
c. broader and higher than what is expected
d. broader and lower than what is expected
broader and higher than what is expected
Which one is the CORRECT statement about melting point determination?
a. Only one measurement is enough.
b. Use the same heating rate all the time.
c. One makes at least two measurements to determine the melting point.
d. Load as little sample into the capillary as one can.
One makes at least two measurements to determine the melting point
Before spotting the plate for Thin Layer Chromatography, the sample was dissolved in:
a. Ethyl Acetate/Hexanes
b. Ethanol
c. Sodium Bicarbonate Solution
d. None of the Above
Ethanol
Which of the following is soluble in NaHCO3?
a. PhCOOH (benzoic acid)
b. PhOH (phenol)
c. benzamide (PhCONH2)
d. benzophenone (PhCOCH3)
PhCOOH (benzoic acid)
Which of the following compounds cannot be purified by recrystallization?
a. liquids
b. solids
c. oils
d. a and c
-Liquids and oils
Which apparatus will you be using to isolate your crystals?
a. Büchner funnel
b. powder funnel
c. Keck clamp
d. both b and c
Buchner Funnel
In the recrystallization lab, the hot filtration is performed to:
a. Recover the acetanilide crystals
b. Remove soluble impurities
c. Remove insoluble impurities
d. Add impurities
Remove insoluble impurities
What is the name of compound that we will recrystallize today?
a. aniline
b. benzoic acid
c. sodium hydroxide
d. acetanilide
acetanilide
You are trying to recrystallize a compound, and some impurities are insoluble at high temperatures. What
technique could be used to remove them?
a. Hot extraction
c. Distillation
b. Hot filtration
d. Thin Layer Chromatography
Hot filtration
IR spectroscopy is very useful to organic chemists because:
a. solubility can be inferred from this data
b. acidity can be inferred from this data
c. structural information can be inferred from this data
d. refractive index can be inferred from this data
structural information can be inferred from this data
During the vacuum filtration, what is the purpose of the filter vac?
a. it separates the solid from the liquid
b. it creates a vacuum seal between the funnel and the filter flask
c. it absorbs the solid acetanilide
d. it does not permit the acetanilide to dissolve
it creates a vacuum seal between the funnel and the filter flask
Which of the following materials will IR radiation not pass through?
a. Glass
c. Sodium Chloride
b. Potassium Bromide
d. Zinc Selenide
Glass
Why do you need to cool the solution down slowly to crystallize?
a. To exclude impurities from growing crystal
b. To let each crystal grow large
c. To avoid breaking the glassware
d. a and b
-To exclude impurities from growing crystal
-To let each crystal grow large
Of the methods we have learned so far, which is the best for determining specific structural and functional
group information about a molecule?
a. Melting Point
c. IR Spectroscopy
b. TLC
d. Solubility Tests
IR Spectroscopy
What was the purpose for hot filtration?
a. to remove insoluble impurities
c. to remove excess solvent
b. to remove soluble impurities d. to get a high yield
to remove insoluble impurities
The region below 1500 cm-1 in IR spectroscopy is called:
a. Functional region
c. Both a and b
b. Fingerprint region
d. Neither a nor b
Fingerprint region
A strong absorbance in the 1800 cm-1 to 1640cm-1 region is characteristic of _____?
a. hydroxyl group
c. methyl group
b. carbonyl group
d. none of the above
carbonyl group
An experimenter doing an extraction of his/her compound from an aqueous HCl layer forgot what layer was
in each flask. What could the experimenter have done to avoid this conundrum?
a. Found a better job
b. Filtered each layer
c. Labeled all flasks clearly
d. There is absolutely nothing that the experimenter could have done to avoid this conundrum.
Labeled all flasks clearly
All of the following are vibrations that the H2O molecule has EXCEPT:
a. aliphatic stretch
c. symmetric stretch
b. bend
d. asymmetric stretch
aliphatic stretch
Which of the following compounds will be soluble in hexane?
a. water
c. KI
b. sodium chloride
d. benzene (C6H6)
benzene (C6H6)
What is the IR absorption range for alkane C-H bond?
a. 2850-2960 cm-1
c. 2100-2260 cm-1
b. 1670-1830 cm-1
d. 1420-1580 cm-1
2850-2960 cm-1
In the extraction experiment, which compound will be isolable in the aqueous phase using base?
a. dichloromethane
b. benzoic acid
c. benzocaine
d. nothing will be isolable in the aqueous phase
benzoic acid
Which of the qualitative tests below are non-destructive to an unknown compound (ie. your compound could
be recovered if desired – it is not destroyed).
a. Melting point
d. all of the above
b. Solubility test e. none of the above
c. FTIR
-Melting point
- Solubility test
-FTIR
What is the major principle of liquid-liquid extraction?
a. It is based upon a difference in solubility of the desired compound between two immiscible liquids
b. It uses the different affinities for a mixture of molecules for a solid phase to separate
compounds
c. It uses the differences in boiling points to separate a mixture of liquids
d. It uses densities to separate a crude mixture
It is based upon a difference in solubility of the desired compound between two immiscible liquids