Quiz 1
Version B
Chapters 13 & 14
4/13/12
On the ParScore form you need to fill in your perm number, test version, and
name. Failure to do any of these things will result in the loss of 1 point.
Your perm number is placed and bubbled in under the ID numbe
CHEM 150
HOMEWORK #4
Due: Monday, 7/23/12
1. A sample of toothpaste was analyzed for its fluoride content by treating a 250 mg sample
with an ionic strength buffer to extract F- followed by dilution to 100.0 mL. The potential
reading with a fluoride ISE w
CHEM 150
HOMEWORK #2 - Solutions
1. A 50.0 mL sample of vinegar (density = 1.06 g/mL) was diluted to 500.0 mL.
Titration of a 50.0 mL aliquot of this solution required 42.5 mL of 0.0900 M
NaOH to reach the end point. Determin the acid content of the vineg
CHEM 150
HOMEWORK #3
Solutions
1. Calculate the standard potential for the reaction
ZnCO3(s) + 2e-
=
Zn(s) + CO32-(aq)
for ZnCO3 having Ksp = 1.4 X 10-11.
E = -1.08 V
2. The following cell was found to have a potential of 0.512V:
Pt(s)H2 (l.00atm)HA (0.20
Chem 113A Homework #2
Due: Tues. 10/16/12
1. Calculate w for the adiabatic expansion of 1 mol of an ideal gas at an initial pressure of 2.00 bar from
an initial temperature of 450 K to a final temperature of 300 K. Write an expression for the work
done in
Chem 113A Homework #2 Solutions 1. Calculate w for the adiabatic expansion of 1 mol of an ideal gas at an initial pressure of 2.00 bar from an initial temperature of 450 K to a final temperature of 300 K. Write an expression for the work done in the isoth
Chemistry 150
Quantitative Analysis
Final Exam (take home)
200 pts. possible
Rules: You may use the following materials: (1) your textbook; (2) your class notes; and
(3) any downloaded items from the course website. Please do your own work, no
collaborati
Chem 113A Homework #1
Solutions
1. The total pressure of a mixture of oxygen and hydrogen is 1.00 atm. The mixture is ignited and the
water is removed. The remaining gas is pure hydrogen and exerts a pressure of 0.400 atm when
measured at the same values
Chem. 113A 2nd Midterm Exam November 29, 2012 Prof. Buratto
Solutions
problem 1
score Jack
2
Hunter
3
Jack
4
Prof. B
5
Hunter
6
Jack
7
Hunter
Useful Constants electron mass proton mass neutron mass atomic mass unit Planck's constant Boltzmann constant Avo
Physical Chemistry (I)
Quiz 02
Nov. 3, 2011
1. (10%)Derive the following expression for calculating the isothermal change in the
constant volume heat capacity:
Because dU = TdS PdV = CV dT + dV
Therefore
2. (10%) For an ideal gas, Prove that C V is indepe
We now have all of the background to calculate the work,
the heat, the change in internal energy U and the change in
enthalpy H for transformations in our model system (ideal
gas inside a piston).
Before doing an example we need to remember an
important
Physics 6A lecture 1 2011-01-04
Physics Mailbag
1. I came across a question in which a pail of water was whirled
at the end of a rope in a vertical circle. From experience, I
know that the water will not fall out of the pail if it is whirled
fast enough.
or for infinitesimal changes
q = heat (discussed later) and w = work
we defined work when studying mechanics as
where
is the displacement against the opposing force
using our model system of an ideal gas inside a cylinder
with a movable piston, we calc
Physics 6A lecture 1 2011-01-04
1. H ow is it that by exerting a CONSTANT force on an object,
we have acceleration? If I m pushing a box and I keep that
force steady, why would the speed of the box increase? This
doesnt make sense to me conceptually.
2. T
We now have all of the background to calculate the work,
the heat, the change in internal energy U and the change in
enthalpy H for transformations in our model system (ideal
gas inside a piston).
Before doing an example we need to remember an
important
Physics 6A lecture 1 2011-01-04
Q4.8
A question for you:
1. Astronauts who are in orbit are still being acted on by gravity
because they stay in orbit. Why do they experience
weightlessness if gravity is still acting upon them?
A ball sits at rest on a ho
The total differential dz written as
is exact iff (if and only if) their exists a function f(x,y) such that
and
the exact differential is then written as
Note: in thermodynamics the function z = f(x,y) is often
written z = z(x,y), and above differential i
Chem 113A Homework #3 Due: Tues. 10/23/12
1. 1.75 moles of an ideal gas with CV,m = 3/2R is transformed from an initial state T = 750 K and P = 1.75 bar to a final state T = 350 K and P = 5.25 bar. Calculate U, H, and S for this process. 2. 1.85 moles of
Physics 6A lecture 1 2011-01-04
Friction
1. Why does the magnitude of static friction in the force
equation have an inequality sign?
Kinetic (sliding) friction:
opposes sliding
2. Does an object need to be in equilibrium to experience static
friction?
3.
Chem. 113A 1st Midterm Exam October 25, 2012 Prof. Buratto
Solutions
problem 1
score Jack
2
Prof. B
3
Hunter
4
Hunter
5
Jack
6
Hunter
7
Jack
1. (15 pts.) A sample consisting of 3.0 mol of an ideal gas (CV,m = 1.5 R) initially at 298 K and 10.0 L, is expan
Chem. 113A Homework #3 Solutions 1. 1.75 moles of an ideal gas with CV,m = 3/2R is transformed from an initial state T = 750 K and P = 1.75 bar to a final state T = 350 K and P = 5.25 bar. Calculate U, H, and S for this process. 3 = , = 1.75 8.3145 (350 -
Chem 113A Homework #1
Solutions
1. The total pressure of a mixture of oxygen and hydrogen is 1.00 atm. The mixture is ignited and the
water is removed. The remaining gas is pure hydrogen and exerts a pressure of 0.400 atm when
measured at the same values
(II)
(100%)
2007/11/05
KEY
R =8.3145 J/K-mol; Cv(ideal gas) =3R/2; Cp(ideal gas) =5R/2; 1 atm =1.01325 bar
40%
1.
Show that the following functions have exact differentials:
(a) x2y + 3y2, (b) x cos xy, (c) x3y2
Answer: A function has an exact differen
Chapter 5: Entropy / Second & Third Laws of Thermodynamics
Although the first law requires that a thermodynamic process conserve energy, it
does not predict which of several possible processes will occur.
A metal rod initially at a uniform temperature cou