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Chemistry C1-C3 > C2.1.6 - Chromatography > Flashcards

C2.1.6 - Chromatography Flashcards

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1
Q

How many chemical phases are in chromatography?

A

2

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2
Q

What are the chemical phases?

A

Stationary and Mobile

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3
Q

What is the difference between the phases?

A

The stationary phase does not include movement but mobile does

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4
Q

What is the stationary phase in Paper Chromatography?

A

Absorbent paper

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5
Q

What is the mobile phase in Paper Chromatography?

A

Any solvent in the liquid state

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6
Q

What is the stationary phase in Thin-Layer Chromatography?

A

Thin Layer of silica or alumina powder spread over a plate of glass or plastic

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7
Q

What are paper and thin-layer chromatography used for?

A

Separating a sample into its components or soluble coloured substances

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8
Q

Describe the process of Thin-Layer Chromatography

A

Put the solvent into a chromatography tank to a depth of about 1 cm. Add a small amount of sample, taking care not to damage the powder on the plate. Let the solvent travel through the powder, and take the plate out before it reaches the top. Analyse the pattern of coloured spots, which is called a Chromatogram

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9
Q

What is the chromatography tank used for?

A

To place the substances in to start chromatography

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10
Q

What does the pattern produced in chromatography depend on?

A

How each component was distributed during each of the chemical phase

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11
Q

What would happen if the component forms stronger bonds with the mobile phase than with the stationary phase?

A

It would travel further up the plate

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12
Q

What would happen if the component forms stronger bonds with the stationary phase than with the mobile phase?

A

It would not travel very far

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13
Q

What is the stationary phase in Gas Chromatography?

A

Silica or alumina powder packed into a metal column

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14
Q

What is the mobile phase in Gas Chromatography?

A

An unreactive carrier gas

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15
Q

What does Gas Chromatography do?

A

It separates the components of a mixture and measures their amounts

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16
Q

Name all the equipment used in gas chromatography

A 
Detector
Oven
Carrier Gas Cylinder
Flow Meter
Vent
Computer
Metal Column
17
Q

What does the carrier gas cylinder do?

A

It supplies the mobile phase

18
Q

Where is the metal column located in during gas chromatography?

A

In the oven

19
Q

What does the detector do?

A

It sends a signal to a computer as each component leaves the column. The computer produces a Chromatogram

Chemistry C1-C3 (24 decks)

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