1. what is GC - describe how the instument is set up and what it is used for 2.

Question

1. what is GC - describe how the instument is set up and what it is used for

2. What is Raoult's law? Why is it used?

additionally...some more easy questions:

3. Steel wool or similar materials are sometimes packed inside distillation (fractional distillation columns) to achieve better separations. How does this help?

4. Why is the boiling point of n-propanol higher than that of n-hexane? Explain in terms of intermolecular forces.

5. Draw a constitutional isomer of cyclohexane that has a lower boiling point. Explain your reasoning.

Explanation / Answer

1)

Gas chromatography (GC), is a common type of chromatography used in analytical chemistry for separating and analyzing compounds that can bevaporized without decomposition. Typical uses of GC include testing the purity of a particular substance, or separating the different components of a mixture (the relative amounts of such components can also be determined). In some situations, GC may help in identifying a compound. In preparative chromatography, GC can be used to prepare pure compounds from a mixture

In gas chromatography, the mobile phase (or "moving phase") is a carrier gas, usually an inert gas such as helium or an unreactive gas such asnitrogen. The stationary phase is a microscopic layer of liquid or polymer on an inert solid support, inside a piece of glass or metal tubing called a column (an homage to the fractionating column used in distillation). The instrument used to perform gas chromatography is called a gas chromatograph (or "aerograph", "gas separator").

2)Raoult's law is a law of thermodynamics established by French physicist

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