Chemistry 457 - Homework #7 Solution
due: Friday, May 12th at 5:00 pm
Readings: Chapter 16 in Engel & Reid. Students may also want to review multidimensional
integration in both Cartesian and spherical-polar coordinates. N.b., much of the kinetic theory o
Chemistry 457 - Homework #8 Solution
Problem 1 - Boosted Maxwell-Boltzmann Distribution. By now you should be
experts on performing three-dimensional integrals over the Maxwell-Boltzmann distribution
fMB (v) =
m 3/2
2
exp(mv2 /2).
Recall that the average
Chemistry 457 - Homework #5 Solution
due: Friday, April 28th at 5:00 pm
Readings: Chapter 15 in Engel & Reid.
Problem 1 - The Einstein Solid. The vibrational partition function for the two-dimensional
Einstein solid is given by
qVxy () = qVx () qVy () =
e
Chemistry 457 - Homework #6 Solution
due: Friday, May 5th at 5:00 pm
Readings: Chapters 15 and 16 in Engel & Reid.
Problem 1 - Equation of State. The equation of state for an atomic or molecular gas
may be determined by differentiating the Helmholtz energ
Problem 1. Gravimetric analysis
A solid mixture weighing 0.5485 g contained only ferrous ammonium sulfate hexahydrate and ferrous
chloride hexahydrate. The sample was dissolved in 25.0 mL of 1 M H2804, oxidized to F e3+ with H202
and precipitated with cup
CHEM 321
Quantitative Analysis
Homework 2, April 10, 2017
1. A 0.7336-g sample of an alloy containing copper and zinc is dissolved in 8 M HCl and diluted to
100 mL in a volumetric flask. In one analysis, the zinc in a 25.00-mL portion of the solution is
p
Exam 1
CHEM 321, Spring 2016
Your name: .
Signature .
Student Number: .
This exam consists of four problems. Each problem gains a maximum of 10 pts. Closed book, no
written notes are allowed. Feel free to use the enclosed tables and formulas. Show all you
CHEM 321
Quantitative Analysis
Homework 3, April 17, 2017
1. Consider a magnesium ion titration with 0.0100 M EDTA. The initial concentration of the
sample to be titrated [Mg2+] = 1.0 102 M. If Kf for magnesium ion with EDTA is 6.2 108,
1) Can the magnesi
CHEM 321
Quantitative Analysis
Challenge Problems 2
1. Acid base titration and buffer solutions
Phosphoric acid (H3PO4) is a triprotic acid. It has three acid dissociation constants: Ka1 = 7.1110-3;
Ka2 = 6.3210-8; Ka3 = 4.5010-13. Assume you have a 50.0m
CHEM 321
Quantitative Analysis
Challenge Problems 1 Solutions
Solutions are provided in blue. Please read the explanations given for each answer. This is a great
way to learn course content and is also a good indication of the expected level of completene
CHEM 321
Quantitative Analysis
Homework 1 Answer Key
1.
(a) Calculate the total volume after mixing the solutions:
V = 10 + 15 + 8.3 + 20 = 53.3 mL
(b) Calculate the moles (n) of the solutes, e.g., for NO3 (note the different stoichiometries):
n( NO3) = 2
Useful tables
Useful Formulas
K sp = [A] [B ]
[ A ][ H 3O + ]
Ka =
[ HA]
a
b
[ HA][OH ]
Kb =
[ A]
K a K b = K w = 10 14
[ A ]
pH = pK a + log
[ HA]
[ HA2 ]
pH = pK a 2 + log
[ H 2 A ]
[ H 2 A ]
pH = pK a1 + log
[ H 3 A]
Kf =
X=
[MetalY ]
K f = K f Y 4
'
[
Chem460
Fall, 2014
Prof. Sasaki
Final Exam
Name:
150 points Total
Only Answers in box will be graded
Good luck!
1. (30) [18]Annulene is an aromatic compound containing 18 carbon atoms. The 1HNMR spectra of [18]annulene at 213 K and 383 K are shown below.
CHEM460
Fall, 2014
Professor Sasaki
EXAM #3 Name
100 points TOTAL Good Luck!
Note: Only answers in the box will be graded.
1. (25) (a) Consider the comparative UV properties of the two compounds, A and B,
shown below.
O
O
A
B
(i) Which of these compounds
CHEM460
Fall, 2014
Professor Sasaki
EXAM #2 Name
100 points TOTAL Good Luck!
Note: Only answers in the box will be graded.
1. (25) (a) Consider a compound with an exact mass of 103.0422. The compound
appears to have 7 carbons based on the (M+1) peak, and
CHEM460
Fall, 2014
Professor Sasaki
EXAM #1 Name
100 points TOTAL Good Luck!
Note: Only answers in the box will be graded.
1. (25) Calculate the theoretical M+1 and M+2 ratios for C4H8S. Include both major
and minor contributors in your calculation. Clear
Chem460
Fall, 2015
Prof. Sasaki
Final Exam
Name:
150 points Total
Only Answers in box will be graded.
Good luck!
1. (30) The following compounds show an intense -* transition in their UV/Vis spectra. Circle the
responsible chromophore in each compound, an
CHEM460
Fall, 2015
Professor Sasaki
EXAM #3 Name
.
100 points TOTAL Good Luck!
Note: Only answers in the box will be graded.
1. (25) (a) Briefly explain how you would distinguish the following pairs of compounds by IR.
(i)
O
H3C
O
CH2CH 3
and
H3C
CH3
(ii)
CHEM460
Fall, 2015
Professor Sasaki
EXAM #1 Name
.
100 points TOTAL Good Luck!
Note: Only answers in the box will be graded.
1. (25) Consider EI-MS of 3-isopropyl-2,4-pentanedione (MW 142).
O
O
3-isopropyl-2,4-pentanedione
(a) Draw the structure of two ac
CHEM460
Fall, 2015
Professor Sasaki
1.
EXAM #2 Name
100 points TOTAL Good Luck!
Note: Only answers in the box will be graded.
(25) Consider cyclopropene, and answer the following questions.
(a) Label all the unique protons in the structure of cyclopropene
Chemistry 457 Homework Assignment #3
due: Friday, April 14th at 5:00 pm
Readings: Chapter 14 in Engel & Reid.
N.b., Exam 1 will be held in class on Friday, April 20th. The exam will cover Chapters 13
and 14 in Engel & Reid. Knowledge of probability theory
Chemistry 457, Homework Solution #1
Posted: Friday, March 31 at 5:00 pm
Readings: Chapters 12 and 13 in Engel & Reid.
Computations in statistical mechanics will require knowledge of basic college mathematics
such as statistics, algebra, and calculus. This
Chemistry 457 Homework #2 Solution
Due: Friday, April 7th at 5:00 pm
Readings: Chapters 12 and 13 in Engel & Reid.
Problem 1 - Permutations of a Deck of Cards. A standard deck of playing cards has
13 cards
cfw_2, 3, 4, 5, 6, 7, 8, 9, 10, J, Q, K, A
for ea
Electronic Dynamics:
Homework #1
1) In quantum mechanics you learned that the selection rules for pure vibrational transitions are n = 1.
Use the Born-Oppenheimer approximation to show how this requirement becomes relaxed for
vibrational transitions that
Electronic Dynamics:
Homework #2
1) Draw a Jablonski diagram for the photophysical processes in a polycyclic aromatic hydrocarbon such
as anthracene, for which the lowest energy spin-allowed absorption process is a to * transition.
Include spin-allowed ab
First exam - Practice questions
ECON 200 C
There are full answers for some of the questions. Learning the economic way of
thinking involves the process of thinking and reasoning through the questions and
writing complete answers, so please write the answe
Combined Uncertainty
Goal: determine uncertainty in calculated result
Desired property rarely measured directly.
Most derive from one or more uncertain measurements.
Example: purification efficiency
Efficiency = 100 ( 1 - Pout /Pin )
Pin, Pout are uncer