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In the Kjeldahl method, what is the purpose of the digestion step using concentrated sulfuric acid?
To release ammonia gas
To oxidize nitrogen
To neutralize the sample
To measure pH
Buchi offers Rotavapor R-300 Evaporation Flask in 2 sizes:
5L and 2L
5L and 1L
5L and 3L
3L and 1L
If we increase the vacuum, will it have an effect on boiling temperatures?
Yes
No
Buchi Sepiatec SFC Chromatography Systems offer detection using: 
UV
ELSD
MS
All of the above
Flash chromatography is often used in which field of science?
Cytology
Geology
Pharmacology
Food and Feed
Buchi offer Kjeldahl Digesters with the following number of samples:
6 and 9
9 and 12
6 and 12
6 and 18
Which of the following statements about preparative separations by SFC chromatography is true?
SFC is primarily used for gas-phase separations
SFC employs supercritical fluids as the mobile phase
SFC uses liquid solvents exclusively
SFC is less efficient than HPLC for preparative separations
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