Chromatography (OCR GCSE Chemistry A, Combined (Gateway Science Suite)): Quizzes

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Chromatography
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What is chromatography used for?

Separate mixtures into compounds

What can chromatography help identify in a mixture?

Different chemicals present

What is the analyte in chromatography?

The mixture of chemicals to separate

What is the stationary phase in chromatography?

Solid material that stays still

What is the mobile phase in chromatography?

Liquid or gas that moves

How do strongly attracted chemicals move in chromatography?

Move slowly

How do weakly attracted chemicals move in chromatography?

Move quickly

What acts as the stationary phase in paper chromatography?

Chromatography paper

What acts as the mobile phase in paper chromatography?

A solvent like water or alcohol

How far do more polar chemicals move in paper chromatography?

A shorter distance

What is the formula for calculating the RfR_f value?

Rf=distance by chemicaldistance by solventR_f = \frac{\text{distance by chemical}}{\text{distance by solvent}}

What is true about the RfR_f value of a specific chemical?

Always the same under same conditions

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