CHEMISTRY 110A
First Midterm Exam
Friday, October 26th, 2012
Name_
Answer each of the questions. You must show all your work to receive full credit.
Use the back if you need more room.
2
sin xdx =
x sin 2x
2
4
d
du
(sin u) = (cos u )
dx
dx
x 2 x sin 2x c
110B Physical Chemistry Homework #1: assigned 1/12/11; due 1/19/11 in class
1. Photoelectron spectra (30 pts) 1.1 A photoelectron spectrometer measures the kinetic energy of the electrons ionized when a molecule absorbs a given photon of light. Suppose on
CORAL reefs grow in a great swath that stretches like a belt around the
belly of the earth, from thirty degrees north to thirty degrees south latitude.
After the Great Barrier Reef, the worlds second-largest reef is off the coast
of Belize. There are exte
CHE 110B
Midterm Exam 2 - Answer Key
2014F
1) Multiple choice, single answer. Circle your choice. (2 pts each)
1.1) Which of the following best explains the resonance condition for a spectroscopic transition?
a.) 2 | |1 must be nonzero.
b.) The energy of
However, in 15 percent of cases, this simple election dichotomy just does not work. We call these
disruptive elections. In these cases, the political sands are shifting underfoot and the
populace is highly agitated; these situations often occur in times o
Republicans will need to win upward of 65 million votes in November. The GOP
will need virtually all Republicans plus a solid majority of Independents and larger
percentages of young people and moderates. It will need to win states it hasnt
carried since
they constituted a category called He, the Great Big Man, the Little Man, allowing for
minor territorial differences. He, or whatever his subjects called him, occupied the leading
administrative office in his county usually he was
sheriff or judge or prob
Point Groups
In assigning a point group, we typically ignore
the fine detail, such as conformation isomers,
of the ligands.
In working problems using group theory, the
point group of the molecule will usually be
provided to you (but not always).
http:/sym
Given a basis of a vector space V,
every element of V can be
expressed uniquely as a linear
combination of basis vectors,
whose coefficients are referred to
as vector coordinates or
components. A vector space can
have several distinct sets of basis
vector
Molecular Spectroscopy
To the physical Chemist, spectroscopy is the natural consequence of the
application of the time-dependent Schrodinger equation to a well-defined
quantum mechanical system, which by definition has well defined quantized
energy level
Infrared Spectroscopy
Infrared spectroscopy is looking at bond vibrations!
The force acting on a weight (atom) attached to a spring
(bond) is proportional to its displacement from equilibrium:
f x
kx
Infrared Spectroscopy
If we pull the weight
down and t
Homework 1 (Due 6/21/16 @ 10:00 a.m.) - Chemwiki
1 of 1
http:/chemwiki.ucdavis.edu/Wikitexts/University_of_California_Davis.
Name: _
Section: _
Student ID#:_
Write out the complete time-independent Hamiltonians for (each term is explicitly given):
a. the
Walsh calculated and discussed the effect of changes in the
geometry of a molecule, e.g. a variation of angles, on the energy
of molecular orbitals. The so-called Walsh diagrams are an
illustration of this dependency.
If the number of valence electrons in
Vibrational motion depends on reduced mass
Rotational motion depends on reduced mass
Hence, they are not separable (i.e., a rigid rotor)
Ideal Spectrum
Real Spectrum
7/13/2016
Chem 110B Lecture 7
2
ro-vibrational spectrum (gas phase)
No transition observe
Homework 2 (Due 6/22/16 @ 10:00 a.m.) - Chemwiki
1 of 2
http:/chemwiki.ucdavis.edu/Wikitexts/University_of_California_Davis.
Name: _
Section: _
Student ID#:_
Normalize the following molecular orbital (on two different atoms)
where
and
are normalized and
T
General LCAO-MO Method of conjugated Systems
-Electron MO Theory
A. Historically the chemistry of unsaturated and aromatic compounds is markedly
different from that of saturated compounds.
B. The unique chemistry has been identified with the electron netw
11/19/2012
Chem 110B Lecture 20
1
Back to Basics
Selection Rules-Time Dependent Perturbation Theory
Stationary states
Electromagnetic
Interaction between
electric dipole and
electromagnetic field
Consider a two-eigenstate time-dependent system
With the ti
The Partition Function
If we defined the partition function as
ZQ
e
Z
Q
E ( p ,q )/ kT
e
i
d
(classical)
Ei / kT
(quantum)
The partition functions are like any other state
variable.
The partition functions are completely defined if you
know the stat
Electronic Transitions (dressed to kill)
The energy levels (eignestates) can be rated in the following order electronic >
vibrational > rotational. Each of these transitions differ by an order of magnitude.
Rotational transitions occur at lower energies (