ORGANIC CHEMISTRY (LL) >CUSTOM PACKAGE<
ORGANIC CHEMISTRY (LL) >CUSTOM PACKAGE<
3rd Edition
ISBN: 9781119781448
Author: Klein
Publisher: WILEY
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Chapter 9.2, Problem 3PTS
Interpretation Introduction

Interpretation:

The target molecule should be drawn for the given statements by using its molecular structure.

Concept introduction:

Configuration: It is refer to the spatial arrangement of the atoms of a chiral molecular entire groups and its stereo chemical description.

R-S Configuration: The carbon bears right hand and left hand nomenclature is used to enantiomers of chiral atoms. The asymmetric or sterocenters labeled as R (Rectus) or S (Sinister) configuration.

Chiral center: The molecules having four different groups attached to central carbon atoms it is called chiral center.

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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 9 Solutions

ORGANIC CHEMISTRY (LL) >CUSTOM PACKAGE<

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