Gas Chromatography
Headspace analysis is carried out in order to

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

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Gas Chromatography
Theoretical plates are used to

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

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Gas Chromatography
Split injection is carried out by

splitting off some of the sample so that it does not enter the column
None of these
splitting the sample into smaller portions to inject at the same time through parallel ports
splitting the sample into smaller portions to inject sequentially

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