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CHEM 317 LAB > FINIAL > Flashcards

FINIAL Flashcards

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1
Q

true or false: Solubility is an important technique in organic synthesis because it is one of the steps in isolating the product you made.

A

true

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2
Q

Which chemical solvent used in this solubility experiment should you have the most respect when handling?

A

Methylene chloride

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3
Q

What is the definition of miscibility?

A

One liquid mixes with another to form an homogeneous solution.

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4
Q

What is the most important reason in organic chemistry to perform a recrystallization?

A

To purify a solid

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5
Q

If you were recrystallizing sulfanilamide today which solvent would you use?

A

ethanol

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6
Q

What is the first step in the recrystallization technique?

A

choose the appropriate solvent for that particular solid.

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7
Q

What is the final step in the recrystallization process?

A

Wash the crystals with cold solvent.

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8
Q

If you were working in the lab today, which compound would you be recrystallizing in the recrystallizing lab?

A

Sulfanilamide

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9
Q

At what rate should your temperature change to obtain the best results for a melting point technique?

A

2 degrees per minute

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10
Q

True or false: The melting point technique will give you an exact melting point, not a melting point range.

A

false

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11
Q

True or false: After loading your sample in the capillary tube, you should drop it several time through a glass tube to compact the sample.

A

true

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12
Q

True or false: To determine the identity of your unknown sample, you should mix it with a compound whose melting point is known.

A

true

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13
Q

True or false: Determining the melting point is a good indicator of a sample’s purity.

A

true

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14
Q

true or false: Multiple extractions result in less product isolation (less efficiency) than one extraction.

A

false

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15
Q

What is the purpose of using MgSO4 in the extraction experiment?

A

It is a drying agent to remove water from the propanoic acid.

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16
Q

What is the dangerous concern when working with diethyl ether?

A

It is explosive and flammable.

17
Q

true or false: Extraction is the process of selectively removing a compound of interest from a mixture using a solvent. Washing is the process of selectively removing unwanted compounds from a mixture using a solvent.

A

true

18
Q

In the extraction experiment what layer will your final product, propanoic acid, be in?

A

Organic layer

19
Q

true or false: most of the compounds you would use in the distillation lab are flammable compounds

A

true

20
Q

What is the proper drip rate to ensure a good distillation?

A

one-to-two drops per second

21
Q

How will you know when the first of your two compounds has distilled over to the receiving flask?

A

When the drop rate and temperature start to decrease.

22
Q

true or false: You should always distill your still pot (round bottom flask) to dryness

A

false

23
Q

Which type of distillation requires more glassware?

A

fractional

24
Q

What does Rf stand for?

A

Retention factor

25
Q

What type of light is used to view your developed TLC plate?

A

short Ultra-violet light

26
Q

Of the two acids you will use today in the Nitration of Bromobenzene lab, which is the stronger?

A

H2SO4

27
Q

Which solvent will you use for recrystallization in the nitration of bromobenzene lab?

A

Ethanol

28
Q

Which compound is the minor product of this reaction? (nitration of bromobenzene lab)

A

2, 4-Dinitrobromobenzene

29
Q

true or false: Your reaction may exceed 60 degrees Celsius. (nitration of bromobenzene lab)

A

false

30
Q

Where would you dispose of your Bromobenzene waste generated in the lab today?

A

Halogenated waste

31
Q

What is the reducing agent in today’s reaction in the Reduction of a Carbonyl lab?

A

NaBH4

32
Q

What is the most dangerous reagent you would work with in the lab today in the Reduction of a Carbonyl lab?

A

Sodium borohydride

33
Q

Which type of organic reaction mechanism is covered in Synthesis of 1-Bromobutane?

A

SN2

34
Q

If you were in lab today, what is the most dangerous chemical you would be working with in Synthesis of 1-Bromobutane lab?

A

18 M sulfuric acid

35
Q

What is the optimum height for the reflux ring in your reaction set-up?

A

Halfway up the reflux condenser.

36
Q

Why is acid used in the first step of the Synthesis of 1-Bromobutane lab?

A

To protonate the alcohol and make a good leaving group, H2O

37
Q

What is one possible noxious by-product might be generated in this reaction 1-Bromobutane lab?

A

HBr(g)

CHEM 317 LAB (1 decks)

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