Questions from General Chemistry

Q: Determine the number of ions undergoing electron transfer at the surface of

Determine the number of ions undergoing electron transfer at the surface of an electrode during each second that an electrochemical cell is operated at 0.0175 A at 100% current efficiency and the part...

Q: A single mixture containing only CHCl3 and CH2Cl2 was divided into five

A single mixture containing only CHCl3 and CH2Cl2 was divided into five parts to obtain samples for replicate determinations. Each sample was dissolved in methanol and electrolyzed in a cell containin...

Q: Define (a) Dalton. (b) Quadrupole

Define (a) Dalton. (b) Quadrupole mass filter. (c) Mass number. (d) Sector analyzer. (e) Time-of-flight analyzer. (f) Electron multiplier.

Q: Is it easier to couple a GC with a mass spectrometer or

Is it easier to couple a GC with a mass spectrometer or an HPLC? Why is this the case? What are the major difficulties in these couplings?

Q: Indicate the order in which the following compounds would be eluted from

Indicate the order in which the following compounds would be eluted from an HPLC column containing a reversed-phase packing: a) Benzene, diethyl ether, n-hexane. b) Acetone, dichloroethane, acetamid...

Q: Describe the effect of pressure on supercritical fluid chromatography.

Describe the effect of pressure on supercritical fluid chromatography.

Q: How do instruments for supercritical fluid chromatography differ from those for

How do instruments for supercritical fluid chromatography differ from those for (a) HPLC and (b) GC?

Q: List some of the advantageous properties of super critical CO2 as a

List some of the advantageous properties of super critical CO2 as a mobile phase for chromatographic separations.

Q: What important property of supercritical fluids is related to their densities?

What important property of supercritical fluids is related to their densities?

Q: Compare supercritical fluid chromatography with other column chromatographic methods.

Compare supercritical fluid chromatography with other column chromatographic methods.