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;
27 Cards in this Set
- Front
- Back
|
Immiscible
|
liquids that when mixed form separate phases
|
|
|
Miscible
|
liquids that when mixed form a single phase
|
|
|
Solvent Extraction
|
transfer of a solute from one phase to another
|
|
|
Chromatography
|
technique in which molecules in a mobile phase are separated because of their different affinities for a stationary phase
|
|
|
Mobile Phase
|
the solvent moving through the column (gas or liquid)
|
|
|
Stationary Phase
|
the phase that doesn't move
|
|
|
Eluent
|
fluid entering the column
|
|
|
Eluate
|
fluid emerging from the end of the column
|
|
|
Elution
|
process of passing a liquid or gas through a chromatography column
|
|
|
Packed Column
|
filled with particles of a stationary phase
|
|
|
Open Tubular Column
|
column with a narrow, hollow capillary with stationary phase coated on the inside walls
|
|
|
Adsorption Chromatography
|
solid stationary phase and a liquid or gas mobile phase are used; solute is adsorbed on the surface of the solid particles
|
|
|
Partition Chromatography
|
high-boiling liquid stationary phase is bonded to a solid surface, which is typically the inside of the silica chromatography column in gas chromatography
|
|
|
Ion-exchange Chromatography
|
anions or cations are covalently attached to the stationary solid phase usually a resin; solute ions of the opposite charge are attracted to the stationary phase
|
|
|
Molecular Exclusion Chromatography
|
molecules are separated by size in a porous gel; no attractive interaction between the stationary phase and solute
|
|
|
Affinity Chromatography
|
employs specific interactions between one kind of solute molecule and a second molecule that is covalently attached to the stationary phase
|
|
|
Volume Flow Rate
|
how many mL of solvent per minute that travel through the column (volume of solvent per unit time)
|
|
|
Linear Flow Rate
|
how many cm of column length are traveled in one minute by solvent (distance per unit time traveled by solvent)
|
|
|
Chromatogram
|
graph showing the detector response as a function of elution time
|
|
|
Retention Time
|
the time needed after injection of the mixture onto the column until that component reaches the detector
|
|
|
Retention Volume
|
the volume of mobile phase required to elute a particular solute from the column
|
|
|
Adjusted Retention Time
|
the additional time required for a solute to travel the length of the column beyond the time required for unretained solvent
|
|
|
Relative Retention
|
the ratio of adjusted retention times for two components (>RR=>separation)
|
|
|
Capacity Factor
|
adjusted retention time for a peak divided by the time for the mobile phase to travel through the column (indicator of efficiency of separation)
|
|
|
Resolution
|
how close two bands in a chromatogram can be to each other and still be seen as two peaks
|
|
|
Diffusion
|
random motion of molecules in a liquid or gas
|
|
|
Diffusion Coefficient
|
rate at which a substance moves randomly from a region of high concentration to a region of lower concentration
|
