Chem lab exam

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40 Terms

1

Actual over theoretical

Percent yield is what over what?

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2

Phenols

What does FeCl3 test for?

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3

Purple

What color does tube turn when reacts with phenol?

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4

2 degrees

What is pure organic compounds melting range?

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5

Lower and widen

What two things do impurities do to melting range?

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6

Chemical for each lane

What proved the TLC plate to be pure samples?

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7

CCl4

Is CCl4 or water more dense

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8

Carbon and hydrogen

Non polar bonds?

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9

Polar bonds larger than 3 carbons

What compounds are soluble in non-polar substances like water?

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10

Polar bonds and 3 carbons or less

What compounds are soluble in polar solvents?

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11

Deprotonate (negative)

In acid/base what does removal of hydrogen do?

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12

Yes but they separate from polarity automatically

With chlorophyll and beta carotene would they separate with acid and base?

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13

Polar

What type of compounds move slowly through the column?

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14

Non-polar

What type of columns move fast through the column?

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15

Steals binding sites fast polar still comes out last

What happens with 70:30 hexane solution?

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16

Polar still comes out last

What happens with 90:10 hexane solution?

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17

Polar

Smallest ref value ?

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18

Less polar, slow so smaller ref values because of less travel

70:30 to 80:20 tlc plate

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19

3200-3650

O-H bond

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20

3100-3500

N-H bond

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21

2850-3000

Sp3

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22

3000-3100

Sp2

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23

2100-2250

Carbon carbon triple bond

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24

2240-2260

Carbon nitrogen triple bond

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25

1670-1780 unique

Carbons doubled oxygen

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26

1640-1680

Carbon carbon alkene

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27

1600 and 1500-1475

Carbon carbon benzene

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28

Sharp narrow melting range

How does melting point asses purity ?

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29

R-CH3

What is acety

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30

Carbonyl and nucleotide groups

How to transfer an acyl group ?

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31

Dry to solid

Why vacuum?

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32

Assess purity

What does FeCl3 do?

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33

Acetylsalicytic acid

What is the filtrate in aspirin lab?

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34

Distance of travel/distance of solvent

RF value calculation?

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35

uV light

How to see organic compounds on plate?

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36

Less polar substance

What compound travels farthest tlc plate?

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37

More polar substances

What leads to faster elation?

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38

Solvent bond shows through that wasn’t only only glove IR

What shows impurity in gloves?

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39

Sink

Acid base and aqueous solution disposal

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40

Mass in g measured/molar mass x moles

How to find LR?

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