Chemistry In Context
9th Edition
ISBN: 9781259638145
Author: Fahlman, Bradley D., Purvis-roberts, Kathleen, Kirk, John S., Bentley, Anne K., Daubenmire, Patrick L., ELLIS, Jamie P., Mury, Michael T., American Chemical Society
Publisher: Mcgraw-hill Education,
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Chapter 11.12, Problem 11.32YT
Interpretation Introduction
Interpretation:
The bond energy of the triple bond in nitrogen has to be compared with other bond energies such as
Concept introduction:
Bond strength comparison:
Comparing the bond strengths, triple bonds are stronger than double bonds which are stronger than single bonds.
Also bond energy and bond length are inversely proportional.
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(a
4 shows scanning electron microscope (SEM) images of extruded
actions of packing bed for two capillary columns of different diameters,
al 750 (bottom image) and b) 30-μm-i.d. Both columns are packed with the
same stationary phase, spherical particles with 1-um diameter.
A) When the columns were prepared, the figure shows that the column with
the larger diameter has more packing irregularities. Explain this observation.
B) Predict what affect this should have on band broadening and discuss your
prediction using the van Deemter terms.
C) Does this figure support your explanations in application question 33?
Explain why or why not and make any changes in your answers in light of
this figure.
Figure 4 SEM images of
sections of packed columns
for a) 750 and b) 30-um-i.d.
capillary columns.³
fcrip
= ↓ bandwidth Il temp
32. What impact (increase, decrease, or no change) does each of the following conditions have on the individual
components of the van Deemter equation and consequently, band broadening?
Increase temperature
Longer column
Using a gas mobile phase
instead of liquid
Smaller particle stationary phase
Multiple Paths
Diffusion
Mass Transfer
34. Figure 3 shows Van Deemter plots for a solute molecule using different column inner diameters (i.d.).
A) Predict whether decreasing the column inner diameters increase or decrease bandwidth.
B) Predict which van Deemter equation coefficient (A, B, or C) has the greatest effect on increasing or
decreasing bandwidth as a function of i.d. and justify your answer.
Figure 3 Van Deemter plots for hydroquinone using different column inner diameters (i.d. in μm). The data was
obtained from liquid chromatography experiments using fused-silica capillary columns packed with 1.0-μm particles.
35
20
H(um)
큰 20
15
90
0+
1500
100
75
550
01
02
594
05
μ(cm/sec)
30
15
10
Chapter 11 Solutions
Chemistry In Context
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Ch. 11.5 - Prob. 11.11YTCh. 11.5 - Prob. 11.12YTCh. 11.6 - Prob. 11.13YTCh. 11.7 - Prob. 11.14YTCh. 11.7 - Prob. 11.15YTCh. 11.7 - Prob. 11.16YTCh. 11.7 - Prob. 11.17YTCh. 11.7 - You Decide Sodium in Your Diet Compare the sodium...Ch. 11.7 - Prob. 11.19YTCh. 11.8 - Prob. 11.20YTCh. 11.8 - Prob. 11.21YTCh. 11.8 - Prob. 11.22YTCh. 11.8 - Which foods should you eat less of, and which ones...Ch. 11.9 - Prob. 11.25YTCh. 11.10 - The theme of the 2015 World Water Day was water...Ch. 11.10 - Prob. 11.27YTCh. 11.11 - Prob. 11.29YTCh. 11.11 - Prob. 11.30YTCh. 11.11 - In this section, we have described the concept of...Ch. 11.12 - Prob. 11.32YTCh. 11.12 - Prob. 11.33YTCh. 11.12 - a. Ammonia (NH3) is applied to soil in the form of...Ch. 11.12 - Prob. 11.35YTCh. 11.13 - Prob. 11.36YTCh. 11.13 - Prob. 11.37YTCh. 11.13 - Prob. 11.38YTCh. 11 - Prob. 1QCh. 11 - Prob. 2QCh. 11 - Prob. 3QCh. 11 - Prob. 4QCh. 11 - Prob. 5QCh. 11 - Prob. 6QCh. 11 - Prob. 7QCh. 11 - Prob. 8QCh. 11 - Here is the condensed structural formula for...Ch. 11 - Prob. 10QCh. 11 - Prob. 11QCh. 11 - Compare and contrast a trans fat to natural...Ch. 11 - Prob. 13QCh. 11 - Prob. 14QCh. 11 - Prob. 15QCh. 11 - Prob. 16QCh. 11 - Prob. 17QCh. 11 - Prob. 18QCh. 11 - Prob. 19QCh. 11 - Prob. 20QCh. 11 - Prob. 21QCh. 11 - Prob. 22QCh. 11 - Prob. 23QCh. 11 - Prob. 24QCh. 11 - Prob. 25QCh. 11 - One theme in this chapter is that what you eat...Ch. 11 - Prob. 27QCh. 11 - Prob. 28QCh. 11 - Prob. 29QCh. 11 - Prob. 30QCh. 11 - Explain to a friend why it is impossible to go on...Ch. 11 - Prob. 32QCh. 11 - Prob. 33QCh. 11 - Prob. 34QCh. 11 - Prob. 35QCh. 11 - Prob. 36QCh. 11 - Prob. 37QCh. 11 - Prob. 38QCh. 11 - Prob. 39QCh. 11 - Prob. 40QCh. 11 - Prob. 41QCh. 11 - Prob. 42QCh. 11 - Prob. 43QCh. 11 - Biodiesel is another example of a biofuel. Answer...Ch. 11 - Prob. 45QCh. 11 - Prob. 46QCh. 11 - Prob. 48QCh. 11 - Prob. 49QCh. 11 - Consider this structural formula for one of the...Ch. 11 - Prob. 51QCh. 11 - Prob. 52QCh. 11 - This chapter (together with Section 5.15) provided...
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