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Chemistry

A branch of physical science that is concerned with the study of matter and energy and how they interact.

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Chemistry > Analytical chemistry

two-dimensional chromatography
Chemistry; Analytical chemistry

A paper chromatography technique in which the sample is resolved by standard procedures (ascending, descending, or horizontal solvent movement) and then turned at right angles in ...

oxidation-reduction indicator
Chemistry; Analytical chemistry

A compound whose color in the oxidized state differs from that in the reduced state.

countercurrent cascade
Chemistry; Analytical chemistry

An extraction process involving the introduction of a sample, all at once, into a continuously flowing countercurrent system where both phases are moving in opposite directions ...

ultimate analysis
Chemistry; Analytical chemistry

The determination of the percentage of elements contained in a chemical substance.

oxygen-flask method
Chemistry; Analytical chemistry

Technique to determine the presence of combustible elements; the sample is burned with oxygen in a closed flask, and combustion products are absorbed in water of dilute alkali ...

crosscurrent extraction
Chemistry; Analytical chemistry

Procedure of batchwise liquid-liquid extraction in a separatory funnel; solvent is added to the sample in the funnel, which is then shaken, and the extract phase is allowed to ...

ultrasensitive mass spectrometry
Chemistry; Analytical chemistry

A form of mass spectrometry in which the ions to be detected are accelerated to megaelectronvolt energies in a particle accelerator and passed through a thin gas cell or foil, ...

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