
EBK CHEMISTRY FOR CHANGING TIMES
14th Edition
ISBN: 8220100663482
Author: MCCREARY
Publisher: PEARSON
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Question
Chapter 1, Problem 3CGP
Interpretation Introduction
Interpretation:
Compare the word in the last column with that in the first column. Discuss any differences in the two definitions. If the word in the last column differs from that in the first column, determine what went wrong in the process.
- Hypothesis
- Theory
- Mixture
- Substance.
Text Entry | Student 1 | Student 2 | Student 3 | Student 4 |
Word | Definition | Word | Definition | Word |
| | | |
Concept Introduction:
A tentative explanation of observed data is known as a hypothesis.
The theory is a set of principles that predict and explain phenomena.
A material system made up of two or more different substances which are mixed but are not combined chemically is said to be a mixture.
Substances are those that can't be broken down into simpler substances.
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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
elow are
experimentally determined van Deemter plots of column efficiency, H, vs. flow rate. H is a
quantitative measurement of band broadening. The left plot is for a liquid chromatography application and the
night is for gas chromatography. Compare and contrast these two plots in terms of the three band broadening
mechanisms presented in this activity. How are they similar? How do they differ? Justify your answers.?
0.4
H (mm)
0.2
0.1-
0.3-
0
0.5
H (mm)
8.0
7.0
6.0
5.0
4.0-
3.0
T
+++
1.0
1.5
0
2.0
4.0
Flow Rate, u (cm/s)
6.0
8.0
Flow Rate, u (cm/s)
Predict the products of this organic reaction:
+
H
ZH
NaBH3CN
H+
n.
?
Click and drag to start drawing a
structure.
X
Chapter 1 Solutions
EBK CHEMISTRY FOR CHANGING TIMES
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