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ochem II lab quizzes

front 1

What is meant by the term bumping?

back 1

Sudden and uncontrolled boiling of liquid

front 2

What is the best technique for removing a round bottom flask from an oil bath?

back 2

Wearing heat-resistant gloves, raise the clamp to lift the flask out of the oil bath. Allow the flask to cool for a while, then use a paper towel to wipe any oil from the bottom of the flask.

front 3

Identify items that can be used to control the boiling when heating liquid in a round bottom flask.

back 3

A stir bar and stir plate

Boiling chips or stones

front 4

According to Markovnikov's rule of the electrophilic addition to an alkene, the electrophile, usually a proton, is more likely to add to the ______ in a double bond. This arrangement places the intermediate carbocation on the _______, which stabilizes it with the presence of ______.

In the major product of a reaction following Markovnikov's rule, the _______ will then end up on the more-substituted carbon in a double bond.

back 4

less-substituted carbon

more-substituted carbon

more substituents

neutrophile

front 5

Determine whether each alcohol could be a major product of the acid-catalyzed hydration of an alkene.

back 5

front 6

Determine the order of steps in the mechanism of acid-catalyzed hydration of propene.

First step

back 6

front 7

Determine the order of steps in the mechanism of acid-catalyzed hydration of propene.

Second step

back 7

front 8

Determine the order of steps in the mechanism of acid-catalyzed hydration of propene.

Third step

back 8

front 9

In general, what are the possible products of an acid-catalyzed hydration of an alkene?

back 9

Primary alcohol

secondary alcohol

tertiary alcohol

front 10

Consider the mechanism of forming phenacetin from p-acetaminophenol, bromoethane, and methoxide.

Identify the species that performs each listed role in the reaction.

Acid____

Base____

Leaving group ____
Nucleophile ____

back 10

Acid: p-Acetamindophenol

Base: Methoxide

Leaving group: Bromide

Nucleophile: p-Acetamindophenolate

front 11

In Williamson ether synthesis, you start by adding a base like methoxide to deprotonate a phenol so the deprotonated phenolate can act as nucleophile. The moles of base should be ____ the moles of phenol. Less base might result in the phenol ______. More base might result in the base_____.

back 11

Equal to

not reacting completely

acting as the nucleophile

front 12

The SN2 mechanism occurs in _____ with the nucleophile attacking _____ the leaving group leaves. Therefore, unsubstituted electrophiles react _____ than substituted electrophiles due to the ______.

back 12

one step, at the same time

Faster, decreased crowding

front 13

During a recrystallization, the goal is to form purified crystals of a solid out of solution. However, you might form an oil instead.

How should you respond if an oil forms during your recrystallization?

back 13

Add more of the recrystallization solvent to form a solution before cooling again

front 14

What is the recommended order of measurements to report the most accurate melting point possible?

Use slow heating to carefully observe melting_____

Use slow heating to confirm the careful measurement_____

Use quick heating to estimate the melting point_____

back 14

second step

third step

first step

front 15

What characteristics should a good sample for melting point determination have?

back 15

Solid phase

small particles

thoroughly dry

front 16

Consider the structure of benzil and its reduction.

The functional group reduced in benzil is ___.

An appropriate reducing agent for this reaction is _____

back 16

a ketone

sodium borohydride

front 17

Is often the ending point of an arrow in a mechanism____

back 17

proton

front 18

Is often the starting point of an arrow in a mechanism____

back 18

hydride

front 19

Can act as a nucleophile

back 19

hydride

front 20

Can act as an electrophile

back 20

proton

front 21

Can act as a reducing agent

back 21

hydride

front 22

Can act as an oxidizing agent

back 22

proton

front 23

Suppose you notice a solid impurity in a small liquid sample with a volume less than 10 mL.

What technique can you use to remove the solid impurity?

back 23

Filter the sample through a Pasteur pipet with glass wool in it

front 24

What statements about the possible hazards of sodium borohydride are correct?

back 24

Sodium borohydride is corrosive.

Sodium borohydride is flammable.

Sodium borohydride can have a violent reaction with acids