CHEMISTRY >CUSTOM<
14th Edition
ISBN: 9781259137815
Author: Julia Burdge
Publisher: McGraw-Hill Education
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Chapter 25, Problem 53QP
Interpretation Introduction
Interpretation:
In the given structures, the carbocations are to be identified.
Concept introduction:
All organic compounds in which the carbon atom containsa positive formal charge are known as carbocations.
Carbocations are considered unstable electrophiles because they have only six electrons in their valence shell.
New bonds are created when an electron-deficient carbocation reacts with electron-rich nucleophiles.
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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 25 Solutions
CHEMISTRY >CUSTOM<
Ch. 25.1 - Prob. 1PPACh. 25.1 - Prob. 1PPBCh. 25.1 - Prob. 1PPCCh. 25.2 - Prob. 1PPACh. 25.2 - Prob. 1PPBCh. 25.2 - Prob. 1PPCCh. 25.2 - Prob. 1CPCh. 25.2 - Prob. 2CPCh. 25.2 - Identify the name of the following compound: a)...Ch. 25.2 - Prob. 4CP
Ch. 25.2 - Prob. 5CPCh. 25.2 - Prob. 6CPCh. 25.3 - Prob. 1PPACh. 25.3 - Prob. 1PPBCh. 25.3 - Prob. 1PPCCh. 25.3 - Prob. 1CPCh. 25.3 - Prob. 2CPCh. 25.3 - Prob. 3CPCh. 25.3 - Prob. 4CPCh. 25.4 - Prob. 1PPACh. 25.4 - Prob. 1PPBCh. 25.4 - Prob. 1PPCCh. 25.5 - Prob. 1PPACh. 25.5 - Prob. 1PPBCh. 25.5 - Prob. 1PPCCh. 25.5 - Prob. 1CPCh. 25.5 - Prob. 2CPCh. 25 - Prob. 1QPCh. 25 - 25.2 Why was Wöhler’s synthesis of urea so...Ch. 25 - Prob. 3QPCh. 25 - Prob. 4QPCh. 25 - Prob. 5QPCh. 25 - Prob. 6QPCh. 25 - Prob. 7QPCh. 25 - Prob. 8QPCh. 25 - Prob. 9QPCh. 25 - Prob. 10QPCh. 25 - Prob. 11QPCh. 25 - Prob. 12QPCh. 25 - Prob. 13QPCh. 25 - Prob. 14QPCh. 25 - Prob. 15QPCh. 25 - Identify the functional groups in the...Ch. 25 - Prob. 17QPCh. 25 - Prob. 18QPCh. 25 - Prob. 19QPCh. 25 - Prob. 20QPCh. 25 - Prob. 21QPCh. 25 - Prob. 22QPCh. 25 - Prob. 23QPCh. 25 - Prob. 24QPCh. 25 - Prob. 25QPCh. 25 - Prob. 26QPCh. 25 - Prob. 27QPCh. 25 - Prob. 28QPCh. 25 - Prob. 29QPCh. 25 - Prob. 30QPCh. 25 - Prob. 31QPCh. 25 - Prob. 32QPCh. 25 - Prob. 33QPCh. 25 - Prob. 34QPCh. 25 - Prob. 35QPCh. 25 - Prob. 36QPCh. 25 - Prob. 37QPCh. 25 - Prob. 38QPCh. 25 - Prob. 39QPCh. 25 - Prob. 40QPCh. 25 - Prob. 41QPCh. 25 - Prob. 42QPCh. 25 - Prob. 43QPCh. 25 - Prob. 44QPCh. 25 - Prob. 45QPCh. 25 - Prob. 46QPCh. 25 - Prob. 47QPCh. 25 - Prob. 48QPCh. 25 - Prob. 49QPCh. 25 - Prob. 50QPCh. 25 - Prob. 51QPCh. 25 - Prob. 52QPCh. 25 - Prob. 53QPCh. 25 - Prob. 54QPCh. 25 - Prob. 55QPCh. 25 - Prob. 56QPCh. 25 - Prob. 57QPCh. 25 - Prob. 58QPCh. 25 - Prob. 59QPCh. 25 - Prob. 60QPCh. 25 - Prob. 61QPCh. 25 - Prob. 62QPCh. 25 - Prob. 63QPCh. 25 - Prob. 64QPCh. 25 - Prob. 65QPCh. 25 - Prob. 66QPCh. 25 - Prob. 67QPCh. 25 - Prob. 68QPCh. 25 - Prob. 69QPCh. 25 - Prob. 70QPCh. 25 - Prob. 71QPCh. 25 - Prob. 72QPCh. 25 - Prob. 73QPCh. 25 - Prob. 74QPCh. 25 - Prob. 75QPCh. 25 - Prob. 76QPCh. 25 - Prob. 77APCh. 25 - Prob. 78APCh. 25 - Prob. 79APCh. 25 - Prob. 80APCh. 25 - Prob. 81APCh. 25 - Match each molecular model with the correct...Ch. 25 - Prob. 83APCh. 25 - Prob. 84APCh. 25 - Prob. 85APCh. 25 - Prob. 86APCh. 25 - Prob. 87APCh. 25 - Prob. 88APCh. 25 - Prob. 89APCh. 25 - Prob. 90APCh. 25 - Prob. 91APCh. 25 - Prob. 92APCh. 25 - Prob. 93APCh. 25 - Prob. 94APCh. 25 - Prob. 95APCh. 25 - Prob. 96APCh. 25 - Prob. 97APCh. 25 - Prob. 98APCh. 25 - Prob. 99APCh. 25 - Prob. 100APCh. 25 - All alkanes give off heat when burned in air. Such...Ch. 25 - Prob. 102APCh. 25 - Prob. 1SEPPCh. 25 - Prob. 2SEPPCh. 25 - Prob. 3SEPPCh. 25 - Prob. 4SEPP
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