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2. (1) What is the mobile phase for gas chromatography (GC)? 3. (1) What is the

ID: 588727 • Letter: 2

Question

2. (1) What is the mobile phase for gas chromatography (GC)? 3. (1) What is the mobile phase for thin-layer chromatography (TLC)? 4. (2) What is the most important physical property in determining the retention time of a compound for GC? For TLC? 5. (1) A more polar compound will be higher or lower on a TLC slide than a less polar compound? 6. (1) Which functional group is more polar, an ester or a carboxylic acid? 7. (1) True or False: A radical reaction mechanism involves homolytic bond cleavages.

Explanation / Answer

2. (1) In gas chromatography, the mobile phase is a carrier gas, usually an inert gas such as helium.

3.(1) The mobile phase in thin layer chromatography, is a suitable loquid solvent or a mixture of solvents.

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