Other Chemistry Answers

Using group 2 of the periodic table as an example, can you describe the variation in the following properties. Electronic configuration, Atomic radii and melting and boiling points.

State and explain the trend in first ionization energies shown by the elements with the atomic numbers 2,10 and 18.

Define the term first ionization energy

Plot the HETP versus the flow rate for following data:

Flow Rate (mL/min)
1) 120.2
2) 90.3
3) 71.8
4) 62.7
5) 50.2
6) 39.9
7) 31.7
8) 26.4

HETP (cm/plate)
1) 0.3154
2) 0.2343
3) 0.2248
4) 0.2378
5) 0.2274
6) 0.2991
7) 0.3206
8) 0.3503

(1) Identify on the graph the optimum flow rate, longitudinal diffusion, mass transfer

(2) Show a theoretical profile of Eddy diffusion on the same graph

Briefly explain in no more than three sentences, how each of these factors will likely affect the retention time of a chromatographic process:

a) Increase the length of the column
b) Decrease carrier gas velocity
c) Increase the thickness of a stationary phase
d) Increase the internal diameter of a column
e) Setting the injection port temperature below the boiling point of the analyte
f) Setting the column temperature below the boiling point of the analyte
g) Significant diffusion of analyte in carrier gas

What isotope or ion has a mass of 11, 2 electrons and a charge of positive 2