Match each statement with one of these terms. a. Elution
b. Mobile phase
c. Chromatogram
d. Stationary phase
e. Retention factor
f. Detector
g. Injection port
h. Carrier gas
i. Theoretical plate number
j. Partition coefficient
k. Retention time
l. None of the above

1. The ratio of the amount of analyte in the stationary phase to the amount in the mobile phase.
2. Time it takes after sample injection into the column for the analyte peak to appear as it exits the column.
3. The process of extracting a component that is adsorbed to a given material by use of an appropriate solvent system.
4. Measure of chromatographic column efficiency. The greater its value, the more efficient the column.
5. Gas, liquid, or supercritical fluid used to transport the sample in chromatographic separations.
6.Immiscible and immobile, it is packed within a column or coated on a solid surface.

1 - e, 2 - k, 3 - a, 4 - i, 5 - b,

Explanation:

The ratio of the amount of analyte in the stationary phase to the amount in the mobile phase. --- Retention factor.

Time it takes after sample injection into the column for the analyte peak to appear as it exits the column. -- Retention time

The process of extracting a component that is adsorbed to a given material by use of an appropriate solvent system. -- Elution

Measure of chromatographic column efficiency. The greater its value, the more efficient the column. -- Theoretical plate number

Gas, liquid, or supercritical fluid used to transport the sample in chromatographic separations. -- Mobile phase

Immiscible and immobile, it is packed within a column or coated on a solid surface. -- Stationary phase

1. the question asks the most appropriate, which seems to rule out "all of the above." your choice appears to be the correct one.

2. the protocol described is good for identifying correlation, but not cause and effect. for cause/effect, you need to devise a protocol that will assign the treatment (or not) to groups that have essentially the same "demographics" with respect to all the other variables. your choice regarding control group seems appropriate. random assignment of treatment (choice d) may be appropriate also. (i think you can argue that b and d are just different descriptions of the same method.)

3. d will randomize the birds, but may not guarantee there are 10 in each group. e will do both, so seems the better choice.

comment on question 2

based on the problem statement, it seems clear that confident, attentive drivers are more likely to use daytime running lights. so, the protocol might need to be devised in such a way that the lights would be turned on or off without the driver's knowledge. (an attentive driver will figure it out.) assigning a confident, attentive driver to a group required to drive without running lights might mess with his/her confidence and attentiveness. you don't want your experiment to do that. (nor do you want the experiment to subject a driver to greater risk of accident as a consequence of driving without running lights.) experiments involving human safety are always problematic.