Answer the following multiple choice questionsbelow:
1a. Increasing the flow rate of the mobile phasewould:
| A. | increase longitudinal diffusion.
|
| B. | affect nothing.
|
| C. | increase broadening due to multiple paths.
|
| D. | increase broadening due to mass transfer.
|
1b. Reverse phase HPLC of a multi-component soluteusually uses:
| A . | an isocratic polar solvent.
|
| B. | a polar stationary phase.
|
| C. | a gradient from more polar to less polarsolvent.
|
| D. | a gradient from less polar to more polarsolvent.
|
1c. When two analytes, A and B, are passed through achromatography column, A emerges first. We can thensay:
| A. | A is less soluble than B in the mobilephase.
|
| B. | A is less strongly adsorbed on the stationary phase thanB.
|
| C. | A has a larger peak area than B.
|
| D. | A is more strongly adsorbed on the stationary phase thanB.
|
1d. In a given chromatographic column,
| A. | you can use a ruler to measure the plateheight.
|
| B. | efficiency is improved by increasing plateheight.
|
| C. | different solutes behave as if there are a differentnumber of theoretical plates for each.
|
| D. | the number of theoretical plates is the same for allsolutes.
|
1e. In a gas chromatography experiment using a non-polarstationary phase:
| A. | solutes are eluted in order of increasingpolarity.
|
| B. | solutes are eluted in order of increasing molarmass.
|
| C. | solutes are eluted in order of increasing boilingpoint.
|
| D. | solutes are eluted in order of increasing vaporpressure.
|
