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Maths > Chromatography (summer exam) > Flashcards

Chromatography (summer exam) Flashcards

1
Q

Chromatography is used to separate mixtures of soluble substances. Simplified Chromatography separates soluble (will dissolve) mixtures. (made up of two different elements that are not chemically bonded)

A

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2
Q

Mixtures that are suitable for separation by chromatography include:
inks, dyes and colours in foods.

A

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3
Q

LOOK AT THE ACTUAL REVISION SLIDES!! (real) till How does this technique work?

A

Yes boyo

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4
Q

The solvent moves through the paper, carrying the different substances within the mixture.

A

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5
Q

The substance that moves least up the chromatogram is the least soluble.

A

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6
Q

The different substances within the mixture have different solubilities.

A

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7
Q

As the solvent travels up the chromatography paper, the substances travel different distances depending on their solubility.

A

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8
Q

The more soluble the substance, the further it travels.

A

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9
Q

Analysing chromatograms
One spot in a vertical line – substance is pure/made from only one colour

A

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10
Q

More than one spot in a vertical line – substance is a mixture/contains a certain number of colours.

A

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11
Q

If spots match horizontally on a chromatogram both substance, contain the same substance.

A

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12
Q

If spots do not match horizontally on a chromatogram, they contain an unknown substance.

A

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13
Q

Sample does not move from start line – the sample is insoluble in the solvent. Solvent needs to change.

A

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14
Q

The substance that moves furthest up the chromatogram is the most soluble.

A

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15
Q

The substance that moves least up the chromatogram is the least soluble.

A

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16
Q

LOOK AT THE ACTUAL REVISION SLIDES!! (real) till Identifying errors from chromatograms (common errors in questions)

A

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17
Q

Common mistakes and the problem includes:
Mistake – start line drawn in ink.
Problem – start line dissolves.

A

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18
Q

Mistake – solvent level above the start line
Problem – samples will dissolve.

A

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19
Q

Mistake – wrong solvent used (depends on question).
Problem – Samples insoluble/will not dissolve in the solvent used.

A

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20
Q

Mistake – no lid placed on top.
Problem – solvent will evaporate.

A

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21
Q

LOOK AT THE ACTUAL REVISION SLIDES!! (real) till Earth’s structure

A

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