
GENERAL CHEMISTRY(LL)-W/MASTERINGCHEM.
11th Edition
ISBN: 9780134566030
Author: Petrucci
Publisher: PEARSON
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Question
Chapter 21, Problem 15E
Interpretation Introduction
Interpretation:
Whether the following process obeys the principal of conservation of charge or not should be determined. Explain.
In sea water, the starting material is
Concept introduction:
According to the principal of conservation of charges, the total charge of a given isolated system will never change. This means that the net electric charge which is equal to the subtraction of quantity of positive charge and the quantity of negative charge in this universe always remains conserved.
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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 21 Solutions
GENERAL CHEMISTRY(LL)-W/MASTERINGCHEM.
Ch. 21 - Prob. 1ECh. 21 - Use information from the chapter to write chemical...Ch. 21 - Prob. 3ECh. 21 - Describe two methods for determining the identity...Ch. 21 - Arrange the following compounds in the expected...Ch. 21 - Prob. 6ECh. 21 - Prob. 7ECh. 21 - A lithium battery used in a cardiac pacemaker has...Ch. 21 - Prob. 9ECh. 21 - Prob. 10E
Ch. 21 - The standard Gibbs energies of formation, rG , for...Ch. 21 - Prob. 12ECh. 21 - Prob. 13ECh. 21 - Prob. 14ECh. 21 - Prob. 15ECh. 21 - Prob. 16ECh. 21 - Prob. 17ECh. 21 - Write chemical equations for the reactions you...Ch. 21 - Without performing detailed calculations, indicate...Ch. 21 - Prob. 20ECh. 21 - With respect to decomposition to MO(s) and SO2(g)...Ch. 21 - Prob. 22ECh. 21 - Prob. 23ECh. 21 - Prob. 24ECh. 21 - Prob. 25ECh. 21 - Prob. 26ECh. 21 - Prob. 27ECh. 21 - Prob. 28ECh. 21 - Prob. 29ECh. 21 - Prob. 30ECh. 21 - Prob. 31ECh. 21 - Prob. 32ECh. 21 - Prob. 33ECh. 21 - Prob. 34ECh. 21 - Prob. 35ECh. 21 - Prob. 36ECh. 21 - Prob. 37ECh. 21 - Prob. 38ECh. 21 - Prob. 39ECh. 21 - Prob. 40ECh. 21 - Prob. 41ECh. 21 - Prob. 42ECh. 21 - Prob. 43ECh. 21 - Prob. 44ECh. 21 - Methane and sulfur vapor react to form carbon...Ch. 21 - Prob. 46ECh. 21 - Prob. 47ECh. 21 - Prob. 48ECh. 21 - Write plausible chemical equations for the (a)...Ch. 21 - Prob. 50ECh. 21 - Prob. 51ECh. 21 - Aqueous tin(II) ion, Sn2+(aq) , is a good reducing...Ch. 21 - Would you expect the reaction of Sn(s) and Cl2(g)...Ch. 21 - Prob. 54ECh. 21 - Prob. 55IAECh. 21 - The following series of observations is made: (1)...Ch. 21 - Prob. 57IAECh. 21 - Prob. 58IAECh. 21 - Prob. 59IAECh. 21 - Prob. 60IAECh. 21 - Lithium superoxide, LiO2(s) , has never been...Ch. 21 - Prob. 62IAECh. 21 - Prob. 63IAECh. 21 - Prob. 64IAECh. 21 - Use data from Appendix D (Table D-2) to calculate...Ch. 21 - Prob. 66IAECh. 21 - A particular water sample contains 56.9 ppm SO42-...Ch. 21 - An aluminum production cell of the type pictured...Ch. 21 - Prob. 69IAECh. 21 - Prob. 70IAECh. 21 - Prob. 71IAECh. 21 - Prob. 72IAECh. 21 - Prob. 73IAECh. 21 - Prob. 74IAECh. 21 - Prob. 75IAECh. 21 - Would you expect the lattice energy of MgS(s) to...Ch. 21 - Prob. 77IAECh. 21 - Prob. 78FPCh. 21 - Prob. 79FPCh. 21 - Prob. 80SAECh. 21 - Briefly describe each of the following ideas,...Ch. 21 - Explain the important distinction between each...Ch. 21 - Prob. 83SAECh. 21 - Prob. 84SAECh. 21 - Predict the products of the following reactions:...Ch. 21 - A chemist knows that aluminum is more reactive...Ch. 21 - Listed are several pairs of substances. For some...Ch. 21 - Prob. 88SAECh. 21 - Prob. 89SAECh. 21 - Prob. 90SAECh. 21 - Prob. 91SAECh. 21 - Prob. 92SAECh. 21 - Prob. 93SAECh. 21 - Prob. 94SAECh. 21 - Prob. 95SAE
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