1) What two properties does a gas chromatogram take advantage of to create a sep

Question

1) What two properties does a gas chromatogram take advantage of to create a separation?

A) density and polarity

B) molecular weight and polarity

C) polarity and boiling point

D) solubility and melting point

2)Why is the boiling point of 3-methylheptane (bp 118 deg. C) less than that of n-octane (bp 125 deg. C)?

A) 3-methylheptane is a branched chain alkane while n-octane is straight chain. Branched chain molecules have lower boiing points because they cannot line up together for the intermolecular forces to be as effective.

B) n-octane has more carbon atoms than 3-methylheptane. Compounds with a greater number of carbons tend to have higher boiling points.

C) 3-methylheptane is an alkene which tend to have lower boiling points than alkanes such as n-octane.

D)n-octane has a greater molar mass. As molar mass increases, so does boiling point.

3) In a gas chromatograph using a polar column, which should pass through the column first: propane, butane, propanol, or butanal?

A) The first out of the column should be propane

B) The first out of the column should be propanol

C) The first out of the column should be butanal

D) The first out of the column should be butane

4) The height equivalent to a theoretical plate (HTEP) is used to determine the _____?

A) time required to complete distillation

B) average boiling point temp.

C) vapor pressure in the distillation column

D) efficiency of a column or the column packing

****These are for a lab assignment so if you're not sure please do not answer, thank you*******

Explanation / Answer

c,a ,b,d

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