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TTU Intro Organic Chemistry Lab final
Terms in this set (53)
Which has a higher vapor pressure? Hexane or nonane
Which should have a higher boiling point? hexane or nonane
Simple distillation is more effective when there is a _________ difference between the boiling points of the two compounds. (large or small)
In a distillation of hexane/nonane mixture, which compound will predominate in the first drops of distillate?
Near the end of a distillation of hexane/nonane mixture, which compound will predominately remain in the boiling flask?
why is it important to have water slowly running through the condenser?
water absorbs heat from the distillate gases allowing them to condense back into a liquid for collection.
How does an increased surface area of a fracionation column help fractional distillations?
the increased surface area provides surfaces for the distillate gasses to condense and then a portion of that condensed liquid to re-vaporize.
which distillation method will give a purer sample of whatever distills first from a hexane/nanone mixture?
what species is formed when benzoic acid reacts with NaOH(aq)?
what is the density of water at room temperature in g/mL?
Which layer will be the ether layer in a separatory funnel containing diethyl ether and a saturated aqueous solution of NaCl?
The top layer
Why should you vent the separatory funnel periodically when preforming an extraciton involving organic solvents?
mixing increases the evaporation of volatile organic solvents creating pressure in the closed space of a separatory funnel.
How much anhydrous magnesium sulfate is required to dry a diethyl ether solution after preforming extractions involving water?
Enough such that some powder remains free flowing in solution with swirling without clumping
what size filter paper should be used withe a Hirsch funnel
which of the following will be most soluble in hot water?
What is a good temperature to set the hot plate to for safely and effectively warming a shell vial with 1 mL of ethanol for recrystallization?
130 degrees C
which of the following is halogenated?
what should the reading be on a balance displaying mass in grams be for a sample weighing 50 mg?
How much solid material is needed to make the spotting solutions in this experiment?
a very small amount, enough to barely cover the top of you spatula
what affect will there be on the TLC experiment if too much compound/mixture is used in making the spotting solution?
the solution will be too concentrated and the resulting spots will streak on the TLC plate
What should be used to mark the silica gel on the TLC plate?
a pencil with a soft tip to avoid gouging the thin layer of silica gel thus preventing the solvent from traveling up the plate.
where should the starting line be drawn in the TLC plate?
near the bottom of the TLC but higher than the level of developing solution to be used in the experiment
what is the Rf value of the spot that travels 2.3 cm on a TLC plate when developed and the solvent traveled 6.8 cm.
Which layer will be the organic layer during the aqueous tea dichloromethane extraction process?
the bottom layer
Which layer will the caffeine preferentially dissolve in during the aqueous tea dichloromethane extraction process?
the dichloromethane layer
a solution is considered dry when which of the following cases is true?
after treatment with an anhydrous salt, the salt clumps together significantly but also has several crystals that do not clump with any other crystal.
When evaporating solvent from a solution by gently blowing compressed air on it, why is it helpful to warm the solution>
evaporating solvent removes heat energy from the solution and container, cooling it in the process and decreasing the vapor pressure of the liquid. warming the solution counters this.
why is it important not to heat the solid caffeine left after the solvent has been evaporated in the final evaporation to long once the solvent is completely evaporated?
the caffeine can sublime decreasing your yield.
Which isomer of 1,2-dibenzoylethylene is most stable?
Electrons in what kind of bond are excited by photons in this experiment?
What term best describes the cis and trans isomer of an alkene like 1,2-dibenzoylethylene?
if a spot on a TLC plate travels 4.5 cm from the starting spot when the solvent traveled 6.0 cm, what is the Rf value?
What mobile phase should you used to develop your TLC plates?
During which step of the free-radical chain-growth polymerization does the polymer actually grow or chain extend?
What gas is produced in the reaction thus necessaitating the need for loosely capped vials to allow it to escape?
what happens if two react with each other to form a new covalent bond during the reaction istead of a radical reaction with a C=C to form a new covalent bond and a new radical?
the reaction terminates
Where should this reaction be preformed?
in the fume hood
What is the mass of AIBN to be used in this reaction expressed in mg?
What is the limiting reagent in this reaction?
what is the role of potassium carbonate in this reaction?
What is the role of 2-butanone in this reaction?
During the extraction procedures, which layer has the higher density?
what is the expected yield of this reaction assuming 0.230 g of acetaminophen is used along with all of the other starting amounts of reagents listed in this experminent?
what role does water play in the reaction with t-BuCl?
Nucleophile, solvent, base
What role does the added NaOH play in the reactions for this experiment?
reactant with HCl produced from the reaction
What color is bromophenol blue under acidic conditions?
how many mL is 300 uL
what role does sulfuric acid play in the Fischer Esterificaiton?
during the extraction processes with aqueous solutions, which layer will be the diethyl ether layer?
what gas is evolved when sodium bicarbonate reacts with an acid?
what is the functional group present in nylon?
where does the reaction in this experiment take place?
at the boundary between the aqueous and organic layer
which of the following best describes the H-bonding in nylon?
the N-H of the amide can H- bond with a nearby carbonyl oxygen.
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