Gas Chromatography
Headspace analysis is carried out in order to

analyse the column contents ahead of the sample
analyse volatile compounds from solid or liquid samples
determine the psychological state of the tutor
determine non-volatiles

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Gas Chromatography
Theoretical plates are used to

determine the thickness of the stationary phase
None of these
estimate the efficiency of a column
measure the distribution of the analyte between mobile and stationary phases

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Gas Chromatography
In column switching chromatography

the flow to the column is switched on and off repeatedly
any of the above
compounds trapped on one column are eluted to another column
one column is removed and replaced by another

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Gas Chromatography
Column bleeding occurs when

the column breaks during installation and causes personal injury
the column is cracked and stationary phase leaks out
elution of the analyte is extended over time
traces of the stationary phase are eluted

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