Chromatography Methods Quiz Questions
24 Questions
| Total Attempts: 305
Questions and Answers
- 1.List the types of substances to which each of the following chromatographic methods is most applicable: Gas- Liquid
- 2.List the types of substances to which each of the following chromatographic methods is most applicable: Liquid- adsorption
- 3.List the types of substances to which each of the following chromatographic methods is most applicable: Gas- solid
- 4.List the types of substances to which each of the following chromatographic methods is most applicable: Ion exchange
- 5.The weak mobile phase is a non-polar solvent (hexane, benzene) and the strong mobile phase is a polar solvent (water, methanol) is for polar supports
- A.
True
- B.
False
- 6.The weak mobile phase is a polar solvent and the strong mobile phase is a non-polar solvent for non-polar supports.
- A.
True
- B.
False
- 7.Isocratic elution
- 8.Changing the composition of the mobile phase with time aka solvent programming:
- 9.2 Describe three general methods for improving resolution in partition chromatography.
- A.
Adjustment of kA and kB by employing a multicomponent mobile phase and varying the raiot of the solvents to find an optimal mixture.
- B.
Variation in the chemical composition of the solvent system in such a way as to make α larger.
- C.
Employing a different packing in which α is greater.
- D.
Going from a weak mobile phase to a strong one
- 10.Describe a way to manipulate the retention factor of a solute in partition chromatography
- 11.How can the selectivity factor be manipulated in (a) gas chromatography and (b) LC?
- 12.In a stop-flow injection
- 13.A reversed-phase packing
- 14.In a normal-phase packing,
- 15.) In ion-pair chromatography
- 16.In ion chromatography,
- 17.A bulk property detector
- 18.A solute property detector
- 19.Sparging
- 20.What is a guard column in partition chromatography?
- 21.What ways are normal- phase partition chromatography and adsorption chromatography similar?
- 22.Describe the fundamental difference between adsorption and partition chromatography.
- 23.Describe the fundamental difference between ion-exchange and size- exclusion chromatography
- 24.What types of species can be separated by HPLC but not GC?
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