CHEM 232 Experiment 7 Exam
Questions and Answers 100%
PASS
What is gas chromatography - CORRECT ANSWER-An analytical technique of
separation and analysis with a mobile and stationary phase.
What is the basis of GC - CORRECT ANSWER-Volatility or boiling point
What is GC limited to - CORRECT ANSWER-compounds that can exist in the
gas phase
What can not be separated by GC? - CORRECT ANSWER-Large biological
molecules
Is GC more of an analytical tool or a preparatory one and why? - CORRECT
ANSWER-Analytical, because it is destructive and the sample can not be retrieved
at the end
In a GC, where is the stationary phase? - CORRECT ANSWER-Coated on the
walls
In GC, where is the mobile phase and what is it - CORRECT ANSWER-It is
flowering and is an inert gas such as helium in our lab. It pushes the sample along
the column
, Is the sample in the gas phase or liquid phase, or both? - CORRECT ANSWER-It
spends part of the time in the gas phase being pushed along the column by the
mobile phase and part of the time interacting with the stationary phase being
retained in the column
A compound with a lower boiling point needs ___ energy in order to get to the gas
phase? - CORRECT ANSWER-Less
What is the stationary phase in our lab composed of? - CORRECT ANSWER-
95% silicone oil and 5% phenyl methyl silicone oil which has a very high boiling
point and is relatively non polar
How can we change the time and reslution in GC - CORRECT ANSWER-By
changing the flow rate of the mobile phase gas and the temperature in the column
Increasing the temperature... - CORRECT ANSWER-gives compunds more
energy and they spend more time in the gas phase, shortening the analysis time but
DECREASING the reoslution
Increasing the flow rate... - CORRECT ANSWER-will push hte samples faster
through the colun giving the mixture less time to separate
Can we change the column length in our lab? - CORRECT ANSWER-No
COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED
Questions and Answers 100%
PASS
What is gas chromatography - CORRECT ANSWER-An analytical technique of
separation and analysis with a mobile and stationary phase.
What is the basis of GC - CORRECT ANSWER-Volatility or boiling point
What is GC limited to - CORRECT ANSWER-compounds that can exist in the
gas phase
What can not be separated by GC? - CORRECT ANSWER-Large biological
molecules
Is GC more of an analytical tool or a preparatory one and why? - CORRECT
ANSWER-Analytical, because it is destructive and the sample can not be retrieved
at the end
In a GC, where is the stationary phase? - CORRECT ANSWER-Coated on the
walls
In GC, where is the mobile phase and what is it - CORRECT ANSWER-It is
flowering and is an inert gas such as helium in our lab. It pushes the sample along
the column
, Is the sample in the gas phase or liquid phase, or both? - CORRECT ANSWER-It
spends part of the time in the gas phase being pushed along the column by the
mobile phase and part of the time interacting with the stationary phase being
retained in the column
A compound with a lower boiling point needs ___ energy in order to get to the gas
phase? - CORRECT ANSWER-Less
What is the stationary phase in our lab composed of? - CORRECT ANSWER-
95% silicone oil and 5% phenyl methyl silicone oil which has a very high boiling
point and is relatively non polar
How can we change the time and reslution in GC - CORRECT ANSWER-By
changing the flow rate of the mobile phase gas and the temperature in the column
Increasing the temperature... - CORRECT ANSWER-gives compunds more
energy and they spend more time in the gas phase, shortening the analysis time but
DECREASING the reoslution
Increasing the flow rate... - CORRECT ANSWER-will push hte samples faster
through the colun giving the mixture less time to separate
Can we change the column length in our lab? - CORRECT ANSWER-No
COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED
