
Masteringchemistry with Pearson Etext -- Standalone Access Card -- For Chemistry
3rd Edition
ISBN: 9780321806383
Author: Nivaldo J. Tro
Publisher: PEARSON
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Chapter 8, Problem 5SAQ
Interpretation Introduction
Introduction: There are four sets of a quantum number, which are principal quantum number
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On the next page is an LC separation of the parabens found in baby wash. Parabens are
suspected in a link to breast cancer therefore an accurate way to quantitate them is desired.
a. In the chromatogram, estimate k' for ethyl paraben. Clearly indicate what values you used for
all the terms in your calculation.
b. Is this a "good" value for a capacity factor? Explain.
c. What is the resolution between n-Propyl paraben and n-Butyl paraben? Again, indicate clearly
what values you used in your calculation.
MAU
| Methyl paraben
40
20
0
-2
Ethyl paraben n-Propyl paraben
n-Butyl paraben
App ID 22925
6
8
min
d. In Figure 4, each stationary phase shows some negative correlation between plate count
and retention factor. In other words, as k' increases, N decreases. Explain this relationship
between k' and N.
Plate Count (N)
4000
3500
2500
2000
1500
1000
Figure 4. Column efficiency (N) vs retention factor (k') for 22
nonionizable solutes on FMS (red), PGC (black), and COZ (green). 3000
Eluent compositions (acetonitrile/water, A/W) were adjusted to obtain
k' less than 15, which was achieved for most solutes as follows: FMS
(30/70 A/W), PGC (60/40), COZ (80/20). Slightly different
compositions were used for the most highly retained solutes. All
columns were 50 mm × 4.6 mm id and packed with 5 um particles,
except for COZ, which was packed with 3 um particles. All other
chromatographic conditions were constant: column length 5 cm,
column j.§. 4.6 mm, flow rate 2 mL/min, column temperature 40 °C,
and injection volume 0.5 μL
Log(k'x/K'ethylbenzene)
FMS
1.5
1.0
0.5
0.0
ཐྭ ཋ ཤྩ བྷྲ ;
500
0
5
10…
f. Predict how the van Deemter curve in Figure 7
would change if the temperature were raised
from 40 °C to 55 °C.
Figure 7. van Desmter curves in reduced coordinates for four
nitroalkane homologues (nitropropane, black; nitrobutane, red;
nitropentane, blue; and nitrohexane, green) separated on the FMS
phase. Chromatographic conditions: column dimensions 50 mm × 4.6
mm id, eluent 30/70 ACN/water, flow rates 0.2-5.0 mL/min, injection
volume 0.5 and column temperature 40 °C. No corrections to the
plate heights have been made to account for extracolumn dispersion.
Reduced Plate Height (h)
°
20
40
60
Reduced Velocity (v)
8. (2) A water sample is analyzed for traces of benzene using headspace analysis. The sample and
standard are spiked with a fixed amount of toluene as an internal standard. The following data are
obtained:
Ppb benzene
Peak area benzene
Peak area toluene
10.0
252
376
Sample
533
368
What is the concentration of benzene in the sample?
Chapter 8 Solutions
Masteringchemistry with Pearson Etext -- Standalone Access Card -- For Chemistry
Ch. 8 - Q1. According to Coulomb's law, if the separation...Ch. 8 - Q2. Which electron in sulfur is most shielded from...Ch. 8 - Prob. 3SAQCh. 8 - Prob. 4SAQCh. 8 - Prob. 5SAQCh. 8 - Prob. 6SAQCh. 8 - Prob. 7SAQCh. 8 - Q8. Which statement is true about effective...Ch. 8 - Prob. 9SAQCh. 8 - Prob. 10SAQ
Ch. 8 - Arrange these atoms and ions in order of...Ch. 8 - Prob. 12SAQCh. 8 - Q13. The ionization energies of an unknown...Ch. 8 - Which statement is true about trends in metallic...Ch. 8 - Q15. For which element is the gaining of an...Ch. 8 - 1. What are periodic properties?
Ch. 8 - Prob. 2ECh. 8 - Prob. 3ECh. 8 - 4. Who is credited with arranging the periodic...Ch. 8 - 5. Explain the contributions of Meyer and Moseley...Ch. 8 - Prob. 6ECh. 8 - Prob. 7ECh. 8 - Prob. 8ECh. 8 - Prob. 9ECh. 8 - 10. What is penetration? How does the penetration...Ch. 8 - 11. Why are the sublevels within a principal level...Ch. 8 - 12. What is an orbital diagram? Provide an...Ch. 8 - Prob. 13ECh. 8 - Prob. 14ECh. 8 - Prob. 15ECh. 8 - Prob. 16ECh. 8 - Prob. 17ECh. 8 - Prob. 18ECh. 8 - Prob. 19ECh. 8 - Prob. 20ECh. 8 - 21. Describe the relationship between an element’s...Ch. 8 - 22. Which of the transition elements in the first...Ch. 8 - 23. Describe how to write the electron...Ch. 8 - Prob. 24ECh. 8 - Prob. 25ECh. 8 - Prob. 26ECh. 8 - 27. What is effective nuclear charge? What is...Ch. 8 - Prob. 28ECh. 8 - Prob. 29ECh. 8 - Prob. 30ECh. 8 - Prob. 31ECh. 8 - Prob. 32ECh. 8 - 33. What is ionization energy? What is the...Ch. 8 - 34. What is the general trend in the first...Ch. 8 - 35. What are the exceptions to the periodic trends...Ch. 8 - 36. Examination of the first few successive...Ch. 8 - Prob. 37ECh. 8 - Prob. 38ECh. 8 - 39. Write a general equation for the reaction of...Ch. 8 - Prob. 40ECh. 8 - 41. Write the full electron configuration for each...Ch. 8 - 42. Write the full electron configuration for...Ch. 8 - 43. Write the full orbital diagram for each...Ch. 8 - 44. Write the full orbital diagram for each...Ch. 8 - 45. Use the periodic table to write an electron...Ch. 8 - 46. Use the periodic table to determine the...Ch. 8 - 47. Use the periodic table to determine each...Ch. 8 - 48. Use the periodic table to determine each...Ch. 8 - Name an element in the fourth period (row) of the...Ch. 8 - 50. Name an element in the third period (row) of...Ch. 8 - 51. Determine the number of valence electrons in...Ch. 8 - Prob. 52ECh. 8 - 53. Which outer electron configuration would you...Ch. 8 - Prob. 54ECh. 8 - 55. According to Coulomb’s law, which pair of...Ch. 8 - 56. According to Coulomb’s law, rank the...Ch. 8 - 57. Which of the following will experience a...Ch. 8 - 58. Arrange the atoms according to decreasing...Ch. 8 - 59. If core electrons completely shielded valence...Ch. 8 - Prob. 60ECh. 8 - 61. Choose the larger atom from each pair.
a. Al...Ch. 8 - Prob. 62ECh. 8 - 63. Arrange these elements in order of increasing...Ch. 8 - 64. Arrange these elements in order of decreasing...Ch. 8 - 65. Write the electron configuration for each...Ch. 8 - 66. Write the electron configuration for each...Ch. 8 - 67. Write orbital diagrams for each ion and...Ch. 8 - Prob. 68ECh. 8 - 69. Which is the larger species in each pair?
a....Ch. 8 - 70. Which is the larger species in each pair?
a....Ch. 8 - 71. Arrange this isoelectronic series in order of...Ch. 8 - Prob. 72ECh. 8 - 73. Choose the element with the higher first...Ch. 8 - Prob. 74ECh. 8 - 75. Arrange these elements in order of increasing...Ch. 8 - Prob. 76ECh. 8 - 77. For each element, predict where the “jump”...Ch. 8 - 78. Consider this set of ionization...Ch. 8 - 79. Choose the element with the more negative...Ch. 8 - Prob. 80ECh. 8 - 81. Choose the more metallic element from each...Ch. 8 - Prob. 82ECh. 8 - 83. Arrange these elements in order of increasing...Ch. 8 - Prob. 84ECh. 8 - Prob. 85ECh. 8 - Prob. 86ECh. 8 - Prob. 87ECh. 8 - Prob. 88ECh. 8 - Prob. 89ECh. 8 - Prob. 90ECh. 8 - Prob. 91ECh. 8 - Prob. 92ECh. 8 - Prob. 93ECh. 8 - Prob. 94ECh. 8 - Prob. 95ECh. 8 - Prob. 96ECh. 8 - Prob. 97ECh. 8 - Prob. 98ECh. 8 - 99. Consider these elements: N, Mg, O, F, and...Ch. 8 - Prob. 100ECh. 8 - Prob. 101ECh. 8 - Prob. 102ECh. 8 - Prob. 103ECh. 8 - Prob. 104ECh. 8 - Prob. 105ECh. 8 - 106. The electron affinity of each group 5A...Ch. 8 - 107. The elements with atomic numbers 35 and 53...Ch. 8 - Prob. 108ECh. 8 - Prob. 109ECh. 8 - Prob. 110ECh. 8 - Prob. 111ECh. 8 - 112. The first ionization energy of sodium is 496...Ch. 8 - 115. Consider the densities and atomic radii of...Ch. 8 - 116. As you have seen, the periodic table is a...Ch. 8 - 117. Consider the metals in the first transition...Ch. 8 - 118. Imagine a universe in which the value of ms...Ch. 8 - Prob. 117ECh. 8 - Prob. 118ECh. 8 - Prob. 119ECh. 8 - Prob. 120ECh. 8 - 123. Unlike the elements in groups 1A and 2A,...Ch. 8 - 124. Using the data in Figures 8.15 and 8.16,...Ch. 8 - 125. Even though adding two electrons to O or S...Ch. 8 - Prob. 124ECh. 8 - 127. The heaviest known alkaline earth metal is...Ch. 8 - Prob. 126ECh. 8 - Prob. 127ECh. 8 - Prob. 128ECh. 8 - 131. Imagine that in another universe atoms and...Ch. 8 - 132. The outermost valence electron in atom A...Ch. 8 - 133. Determine whether each statement regarding...Ch. 8 - Prob. 132ECh. 8 - Prob. 133E
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