Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
23 Cards in this Set
- Front
- Back
|
Adsorption
|
The attraction of one substance to the surface of another.
|
|
|
calibration graph
|
A plot of data involving two variables that is used to determine values for one of the variables.
|
|
|
carrier gas
|
The gas used as the mobile phase in gas chromatography.
|
|
|
chromatogram
|
The trace or plot that is obtained when the components of a mixture are separated by chromatography.
|
|
|
chromatography
|
A technique for separating the components of a mixture. The components are carried by a mobile phase (gas or liquid) over the adsorbent surface of a stationary phase, which can be solid or liquid.
|
|
|
column chromatography
|
A chromatographic technique in which the stationary phase is contained in a column, as for example in gas chromatography.
|
|
|
desorption
|
The breaking of the bonds between a substance and the surface to which the substance is adsorbed.
|
|
|
eluent
|
A liquid used as the mobile phase in chromatography.
|
|
|
flame ionisation detector
|
A device used to identify organic compounds leaving a GC column. The compounds are burnt in a hydrogen–oxygen flame and are attracted to electrodes, creating an electric current.
|
|
|
gas chromatography(GC)
|
A form of chromatography in which the mobile phase is a gas. It includes the techniques of gas–liquid chromatography and gas–solid chromatography.
|
|
|
high performance (or pressure) liquid chromatography
|
A very sensitive form of chromatography in which the mobile solvent phase is pumped through the stationary phase under high pressure.
|
|
|
injection point
|
The part of an analytical instrument into which a sample is injected.
|
|
|
liquid stationary phase
|
A viscous liquid used as the stationary phase in chromatography. The components of a mixture undergo adsorption to this liquid as they are carried along by the mobile phase.
|
|
|
mobile phase
|
The phase that moves over the stationary phase in chromatography.
|
|
|
origin
|
The point at which a small spot of a mixture is placed so that it can be separated by thin-layer chromatography.
|
|
|
retention time
|
The time taken for a component to pass through a chromatography column.
|
|
|
sample cell
|
A cell in an analytical instrument that contains the sample to be analysed.
|
|
|
solid stationary phase
|
An adsorbent solid such as alumina or activated charcoal which is used as the stationary phase in chromatography. The components of a mixture undergo adsorption to this solid as they are carried along by the mobile phase.
|
|
|
solvent
|
A liquid in which other substances dissolve.
|
|
|
solvent front
|
The point reached by the mobile phase as it moves along the stationary phase in thin-layer chromatography.
|
|
|
standards
|
Chemicals of known composition used for comparison.
|
|
|
stationary phase
|
A solid, or a solid that is coated in a viscous liquid, used in chromatography. The components of a mixture undergo adsorption to this phase as they are carried along by the mobile phase.
|
|
|
thin-layer chromatography(TLC)
|
Chromatography using as the stationary phase a thin layer of fine powder spread on a glass or plastic plate.
|
