A2 Chemistry definitions for analysis of organic compounds

Phase

it is a physically distinctive form of a substance, such as the solid, liquid, and gaseous states of ordinary matter.

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mobile phase

it is the phase which moves in chromatography.

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stationary phase

it is the phase which does not move in chromatography.

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chromatogram

it is a visible record showing the results of separation of the components of a mixture by chromatography

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Rf value

it is calculated by the distance moved by a component divided by the distance moved by the solvent front in thin-layer chromatography.

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retention time

it is the time for a component to pass from the column inlet to the detector in gas chromatography.

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chemical shift

it is the scale that compares the frequency of an NMR absorption with the frequency of the reference peak of TMS at 0ppm

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it is the phase which moves in chromatography.

mobile phase

it is the phase which does not move in chromatography.

it is a visible record showing the results of separation of the components of a mixture by chromatography

it is calculated by the distance moved by a component divided by the distance moved by the solvent front in thin-layer chromatography.

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