EBK A SMALL SCALE APPROACH TO ORGANIC L
4th Edition
ISBN: 9781305446021
Author: Lampman
Publisher: CENGAGE LEARNING - CONSIGNMENT
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Chapter 54, Problem 1Q
Interpretation Introduction
Interpretation:
The benzophenone n-Π* triplet T1 without having benzophenone pass through its first singlet stateneeds to be determined.
Concept Introduction:
In the singlet state; the orientation of electrons has the same spin while in the triplet state; the orientation of electrons has the opposite spin.
Expert Solution & Answer
Explanation of Solution
The reaction between benzophenone and isopropyl alcohol is shown below:
The quantum yield for the given reaction is a unity which states that each molecule of excited benzophenone gives one molecule of benzo pinacol. In the given reaction; fluorescence is not observed, a triplet excited state is involved. n-Π* triplet excited state takes a hydrogen atom from isopropanol.
The mechanism of the given reaction is shown below:
Where,
S0 = singlet ground state
S1 = first singlet excited state
T1 = first triplet excited state
ISC = intersystem crossing
According to the mechanism; it shows that the singlet excited state of benzophenone gores through intersystem crossing to triplet state very readily. Therefore, it is the triplet state that is involved.
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111
States of Matter
Understanding conceptual components of the enthalpy of solution
0/5
Ge
A small amount of acetonitrile (CH, CN) is dissolved in a large amount of water. Imagine separating this process into the four stages sketched below. (These
sketches show only a portion of the substances, so you can see the density and distribution of atoms and molecules in them.)
CH,CN
H₂O
B
88
C
Use these sketches to answer the questions in the table below.
The enthalpy of solution AH is negative
soln
when CH3CN dissolves in water. Use this
information to list the stages in order of increasing
enthalpy.
Would heat be absorbed or released if the system
moved from Stage C to D?
What force would oppose or favor the system
moving from Stage C to D? Check all that apply.
1
absorbed
O released
neither absorbed nor released.
none
O ionic bonding force
covalent bonding force…
In a system with an anodic overpotential, the variation of ŋ as a function of
the current density:
1. at low fields is linear 2. at higher fields, it follows Tafel's law
Find the range of current densities for which the overpotential has the same
value as when calculated for cases 1 and 2 (maximum relative difference of
5% with respect to the behavior for higher fields). To which overpotential
range does this correspond?
Data: 10 = 1.5 mA cm², T = 300°C, ẞ = 0.64, R = 8.314 J K 1 mol¹ and F = 96485
C mol-1.
Indicate 10.6 with only one significant figure.
Chapter 54 Solutions
EBK A SMALL SCALE APPROACH TO ORGANIC L
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