WorksheetsChromatography Efficiency Quiz
Total questions: 10
Worksheet time: 5mins
What is the equation that describes the efficiency of chromatographic columns?
Newton's second law
van Deemterequation
Boyle's law
Einstein's equation
What does the term A represent in the van Deemterequation?
Column length
Diffusion coefficient
Multipath effects (eddy diffusion)
Retention factor
What does the term B represent in the van Deemterequation?
Retention factor
Multipath effects (eddy diffusion)
Diffusion coefficient
Column length
What does the term C represent in the van Deemterequation for the stationary phase?
Diffusion coefficient of the analyte in stationary phase
Thickness of liquid coating on stationary phase
Diameter of packing particles
Retention factor
What does the term C represent in the van Deemterequation for the mobile phase?
Diffusion coefficient of the analyte in mobile phase
Diameter of packing particles
Thickness of liquid coating on stationary phase
Retention factor
What is the effect of eddy diffusion on band broadening in chromatography?
It is independent of solvent velocity
It is not affected by the quality of the packing
It is directly proportional to the linear velocity of the mobile phase
It decreases with high mobile phase velocities
What is the relationship between the B term and the linear velocity of the mobile phase?
Directly proportional
Inverse proportional
No relationship
Exponential relationship
What is the effect of longitudinal diffusion on band broadening in chromatography?
It decreases with high mobile phase velocities
It is not affected by the diffusion coefficient
It is independent of the quality of the packing
It is more significant in GC than in LC
What is the optimal flow rate at which the plate height is a minimum in chromatography?
uopt
u min
u average
u max
What is the process in which species migrate from a more concentrated part of a medium to a more dilute region?
Filtration
Diffusion
Evaporation
Osmosis
