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2023 SEM 1 INORG & ORG CHEM > pre lab quiz 5 > Flashcards

pre lab quiz 5 Flashcards

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1
Q

It means color writing

A

Chromatography

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2
Q

Chromatography literally means

A

Color writing

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3
Q

Chromatography is a method of separating the…

A

Components of the mixture

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4
Q

Chromatography is widely used for _____ and _____ analyses or for _____ and _____ of the components of a mixture

A

Quantitative
Qualitative
Isolation
Recovery

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5
Q

These components have different affinities and distributes between 2 phase:

A

Stationary phase
Mobile phase

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6
Q

The mobile which can be a ____ or a _____, that moves in ___________ and passes over the ______

A

Liquid
Gas
Definite direction
Stationary phase

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7
Q

The components of the mixture are introduced at _____

A

One end of the stationary phase

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8
Q

As the stationary and mobile phase interacts with one another, different compounds migrate at ____ and ______ based on their ____.

A

Different rates
Separate from one another
Affinities

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9
Q

A substance that has stronger attractive forces with the ______ will migrate more _______ than a substance that has weaker attractive force

A

Stationary phase
Slowly

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10
Q

The ability of a substance to ______ in and move with the _____ phases enables it to travel more easily over the _____ phase

A

Dissolve
Mobile
Stationary

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11
Q

What are the 4 types of chromatography

A

TLC
LC
HPLC
GC

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12
Q

The most suitable chromatography is based on
1)
2)
3)
to separate

A

1) purpose of the separation
2) available resources
3) properties of the compounds

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13
Q

In this experiment, thin layer chromatography will be used to analyze the _____ from the previous experiment

A

Extracted caffeine

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14
Q

TLC is ____, ____ , ____, _____ and it requires only _____ quantities of material

A

Simple, inexpensive, fast and efficient
Small

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15
Q

In TLC, various materials can be used as the _____ phase

A

Stationary phase

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16
Q

_____, _____, or _____ are coated with a thin layer of adsorbent, can be used as a stationary phase

A

Glass
Metals
Plastic plates

17
Q

Glass, metals or plastic plates are coated with a_____, can be used as a stationary phase

A

Thin layer of absorbent

18
Q

The mobile phase is _____ solvent or a _____ of solvents

A

Pure
Mixture

19
Q

The appropriate composition of the mobile phase depends on the _____ in the mixture being separated

A

Polarities of the compound

20
Q

The stationary phase is usually ____ - _____ is _____ widely used

A

Polar - silica gel
Most

21
Q

The stationary phase is polar -

A

Silica gel is most widely used

22
Q

What is the formula of the Rf

A

Distance traveled by the solute (mm) / distance traveled by the solvent form (mm)

23
Q

What are 3 objectives of this activity

A

Perform thin layer chromatography
Check the purity of the extracted crude caffeine from previous experiment
Calcite the Rf value of the crude caffeine

24
Q

What are the reagents used (MIC)

A

Methanol
Iodine crystals
Chloroform

25
Q

What are the needed glassware

A

2 beaker 250ml
2 beaker 100ml
2 test tube
2 watch glass
1 stirring rod
1 graduated cylinder
1 capillary tubes

26
Q

What is the instrument used

A

UV lamp

27
Q

To perform TLC analysis, a small amount of the mixture is being separated is dissolved in a _____ and applied or spotted onto the ____________

A

Suitable solvent

Adsorbent near one end of a TLC plate

28
Q

Then, the plate is places in a closed chamber with the edge nearest the ______ immersed in a _____ layer of the _____ phase called the, ______

A

applied spot
shallow
mobile phase
developing solvent

29
Q

Where is the plate placed at

A

Closed developing chamber

30
Q

The solvent rises through the stationary phase by _______ , a process called developing the chromatogram

A

capillary action

31
Q

The solvent rises the rough the stationary phase by capillary action, a process called ______

A

Developing the chromatogram

32
Q

After allowing the chromatogram to develop,
the _____ can be marked and
the distance travelled by the ________ and ______ can be measured

A

Spots
Solvent front
Spots

33
Q

Rf

A

Retardation factor

34
Q

It is a dimensionless quantity that can be used as a measure of the affinity of the spot towards the stationary or mobile phase

A

Rf - retardation factor

35
Q

High value of Rf =

A

High affinity towards the mobile phase

36
Q

Do not look directly in the…

A

Uv lamp

37
Q

What can be disposed directly to the sink with running water

A

Diluted aq solutions
Acid wastes that can be diluted with water

38
Q

Chloroform molecular formula

A

CHCl3

2023 SEM 1 INORG & ORG CHEM (22 decks)

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