Principles of Instrumental Analysis
7th Edition
ISBN: 9781337468039
Author: Skoog
Publisher: Cengage
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Chapter 2, Problem 2.11QAP
Interpretation Introduction
Interpretation:
Using the equation related to Ohm’s law, current at the beginning & completion of the
Concept introduction:
The equation for Ohm’s law is given below.
Here, V is voltage, I is current, and R is resistance.
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Part II. two unbranched ketone have molecular formulla (C8H100). El-ms showed that
both of them
have a molecular ion peak at m/2 =128. However ketone
(A) has a fragment peak at m/2 = 99 and 72
while ketone (B) snowed a
fragment peak at m/2 = 113 and 58.
9) Propose the most plausible structures for both ketones
b) Explain how you arrived at your conclusion by drawing the
Structures of the distinguishing fragments for each ketone,
including their fragmentation mechanisms.
Part V. Draw the structure of compound tecla using the IR spectrum Cobtained from
the compound in KBr pellet) and the mass spectrum as shown below.
The mass spectrum of compound Tesla showed strong mt peak at 71.
TRANSMITTANCE
LOD
Relative Intensity
100
MS-NW-1539
40
20
80
T
44
55
10
15
20
25
30
35
40
45
50
55
60
65
70
75
m/z
D
4000
3000
2000
1500
1000
500
HAVENUMBERI-11
Chapter 2 Solutions
Principles of Instrumental Analysis
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- Technetium is the first element in the periodic chart that does not have any stable isotopes. Technetium-99m is an especially interesting and valuable isotope as it emits a gamma ray with a half life ideally suited for medical tests. It would seem that the decay of technetium should fit the treatment above with the result In(c/c) = -kt. The table below includes data from the two sites: http://dailymed.nlm.nih.gov/dailymed/druginfo.cfm?id=7130 http://wiki.medpedia.com/Clinical: Neutrospec_(Technetium_(99m Tc)_fanolesomab). a. b. C. Graph the fraction (c/c.) on the vertical axis versus the time on the horizontal axis. Also graph In(c/c.) on the vertical axis versus time on the horizontal axis. When half of the original amount of starting material has hours fraction remaining disappeared, c/c = ½ and the equation In(c/c.) = -kt becomes In(0.5) = -kt1/2 where t₁₂ is the half life (the time for half of the material to decay away). Determine the slope of your In(c/c.) vs t graph and…arrow_forwardPlease correct answer and don't use hand ratingarrow_forward1. a) Assuming that an atom of arsenic has hydrogen-like atomic orbitals, sketch the radial probability plots for 4p and 4d orbitals of S atom. Indicate angular and radial nodes in these orbitals. (4 points) b) Calculate Zeff experienced by and electron in 4p AO's in a arsenic atom. Use Slater rules that were discussed in lecture. (3 points)arrow_forward
- What is the pH of the Tris buffer after the addition of 10 mL of 0.01M NaOH? How would I calculate this?arrow_forwardWhy do isopolianions form polymeric species with a defined molecular weight? What does it depend on?arrow_forwardWhat are isopolianions? Describe the structural unit of isopolianions.arrow_forward
- Justify the polymerization of vanadates VO43-, as a function of concentration and pH.arrow_forwardWhat is the preparation of 500 mL of 100mM MOPS buffer (pH=7.5) starting with 1 M MOPS and 1 M NaOH? How would I calculate the math?arrow_forwardIndicate the correct option.a) Isopolianions are formed around metallic atoms in a low oxidation state.b) Non-metals such as N, S, C, Cl, ... give rise to polyacids (oxygenated).c) Both are incorrect.arrow_forward
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