Chemistry in Context
8th Edition
ISBN: 9780073522975
Author: American Chemical Society
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 1.3, Problem 1.8YT
Sulfur dioxide (SO2) is released in the air when copper ore is smelted to make copper metal. Let’s assume that a woman living downwind of a smelter inhaled 44 μg of SO2 in an hour.
- a. If she inhaled 625 liters (0.625 m3) of air per hour, would she exceed the 1-hr average for the U.S. National Ambient Air Quality Standards for SO2? Support your answer with a calculation.
- b. If she were exposed at this rate for three hours, would she exceed the 3-hr average?
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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 1 Solutions
Chemistry in Context
Ch. 1.1 - Prob. 1.2CTCh. 1.1 - The air is different in a pine forest, a bakery,...Ch. 1.1 - Scientific Practices More Oxygen ? We live in an...Ch. 1.2 - Prob. 1.5SCCh. 1.3 - Sulfur dioxide (SO2) is released in the air when...Ch. 1.4 - Prob. 1.9YTCh. 1.5 - Prob. 1.10CTCh. 1.6 - Prob. 1.11YTCh. 1.11 - Prob. 1.19YTCh. 1.11 - Prob. 1.21YT
Ch. 1.12 - Summarize what you have learned about ozone...Ch. 1.13 - Prob. 1.27YTCh. 1.13 - Prob. 1.28YTCh. 1.13 - Prob. 1.29SCCh. 1.13 - Prob. 1.30YTCh. 1.13 - Prob. 1.35CTCh. 1 - Prob. 1QCh. 1 - Prob. 2QCh. 1 - Prob. 3QCh. 1 - Identify three sources of particulate matter found...Ch. 1 - Prob. 5QCh. 1 - Prob. 6QCh. 1 - In these diagrams, two different types of atoms...Ch. 1 - Prob. 8QCh. 1 - Prob. 9QCh. 1 - Prob. 10QCh. 1 - Prob. 11QCh. 1 - Prob. 12QCh. 1 - Prob. 13QCh. 1 - Consider the following blank periodic table. a....Ch. 1 - Classify each of these substances as an element, a...Ch. 1 - Prob. 16QCh. 1 - Hydrocarbons are important fuels that we burn...Ch. 1 - Prob. 18QCh. 1 - Arrange these types of radiation in order of...Ch. 1 - These questions relate to the combustion of...Ch. 1 - Balance these equations in which ethane (C2 H4)...Ch. 1 - Prob. 22QCh. 1 - Count the atoms on both sides of the equation to...Ch. 1 - Prob. 24QCh. 1 - Nail polish remover containing acetone was spilled...Ch. 1 - Prob. 26QCh. 1 - Prob. 27QCh. 1 - Prob. 28QCh. 1 - Prob. 29QCh. 1 - Prob. 30QCh. 1 - A headline from the Anchorage Daily News in Alaska...Ch. 1 - Prob. 32QCh. 1 - Consider how life on Earth would change if the...Ch. 1 - Prob. 34QCh. 1 - Prob. 35QCh. 1 - Prob. 36QCh. 1 - Prob. 37QCh. 1 - Prob. 38QCh. 1 - Prob. 39QCh. 1 - Prob. 40QCh. 1 - Prob. 41QCh. 1 - Prob. 42QCh. 1 - Prob. 43QCh. 1 - Prob. 44QCh. 1 - Prob. 45QCh. 1 - Prob. 46QCh. 1 - Prob. 47QCh. 1 - Prob. 48QCh. 1 - Prob. 49QCh. 1 - Mercury, another serious air pollutant, is not...Ch. 1 - The EPA oversees the Presidential Green Chemistry...Ch. 1 - Prob. 52QCh. 1 - Here are two scanning electron micrograph images...Ch. 1 - Prob. 54QCh. 1 - Prob. 55QCh. 1 - Prob. 56QCh. 1 - Prob. 57QCh. 1 - You may have admired the beauty of hardwood...Ch. 1 - Prob. 59Q
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