Altering the stationary phase film thickness in GC can result in changes in the separation selectivity:

Which of the species in the diagram shown, has a higher value for the distribution constant (Kx)?

Which of the following absorption maxima is not in the visible range of the electronic spectrum?

Which of the species in the diagram shown, has a higher affinity for the mobile phase?

Which of the following statements is consistent with an electronic absorption being broad?

(01.02 HC)  Given the following cumulative frequency table, what is the mean of the distribution? (5 points) Value (X) Cumulative Frequency 2 0.05 4 0.40 6 0.45 8 0.70 10 1.00

As the components elute from the column they pass into a detector where some physiochemical property of the analyte is measured (the response).

Identify the parts of the check valves:

Which of the following is the most convenient way to alter analyte retention factor in Gas Chromatography?

(01.02 LC)  A shoe store owner is trying to decide which website to use for his store. He gathers information on the customer ratings for each website and constructs a boxplot of each. There are the same number of ratings for each website. The results are shown in the following boxplots: Based on these boxplots, which of the following is not true? (5 points)