1st Semester Physical Chemistry Practice Final 2
1. Put a positive or negative sign next to each of the following to mark whether the entropy of the system increases or decreases during the following
Please reread section 5.2 if you have problems with the equilibria problems. I will add a few more questions in a part two of the practice Final. I will be available during office hours and by appoint
Physical Chemistry
The application of the principles and methods of physics and math to problems related to chemistry. A study of the physical principles underlying chemistry. (How and why materials
Department of Chemistry Seminar Series
Professor Jin Zhong Zhang Department of Chemistry University of California @ Santa Cruz
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Under many conditions, real gases do not follow the ideal gas law . -
This lists important topics to study for the midterm. It is not necessarily a complete list of topics and is meant as a study guide only. The first Law of thermodynamics Extensive and Intensive Proper
Practice Midterm Pchem 161A. Work in Small Groups. This is more material than will be in the in class test. A substantial portion of the in-class test will be taken from this practice midterm.
1) What
The First Law of Thermodynamics Thermodynamic transformations
Signs for heat (q) and work (w)
1
q is q is w is w is
+ +
if heat is added to system if heat is lost by system if work is done on the sys
Name:_ Midterm 161A Fall Semester 2009 October 15 Show ALL of your WORK!
1) Which are extensive and intensive properties. (2 points) Circle the extensive variables: a) b) c) d) e) Volume Pressure Temp
The first Law of thermodynamics Extensive and Intensive Properties State functions Euler's test for State functions Exact and inexact differentials Ideal Gasses Van der Waals equation of state Reversi
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State Variables
The Physical State of a system is completely described by a small number of Macroscopic Variables (N,V,T,U, concentrations. we will add more later on)
These variables are called stat
Ideal Gas Law
The combination of these three laws gives the ideal gas law which is a special form of an equation of state, i.e., an equation relating the variables that characterize a gas (pressure, v
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Internal Energy of a Classical ideal gas
"Classical" means Equipartition Principle applies: each molecule has average energy kT per quadratic mode in thermal equilibrium.
q
At room temperature, for
1)
Show that the van der Waals pressure is a state function. a. First write down the differential dp given that the pressure is a function of Volume and temperature p(V,T) b. Apply Euler's method of m
Practice Midterm Pchem 161A. Work in Small Groups. This is more material than will be in the in class test. A substantial portion of the in-class test will be taken from this practice midterm.
1) What
Reversible Process
Grains of sand
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Remove one grain of sand at a time. Allow system to equilibrate Pressure decreases by very small amount Volume increases by very small amount. In limit of infinites
Enthalpy
H U + PV - the enthalpy isochoric: isobaric: qv = U qp = H
in both cases, q does not depend on the path from 1 to 2.
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Energy is often described as the capacity to do work. PV also has the ca
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Internal Energy of a Classical ideal gas
"Classical" means Equipartition Principle applies: each molecule has average energy kT per quadratic mode in thermal equilibrium.
q
At room temperature, for
T he Fi r st La w of T her modyna mi cs Thermodynamic transformations
Signs for heat (q) and work (w)
1
q is q is w is w is
+ +
if heat is added to system if heat is lost by system if work is done on
Carnot Cycle
We see that:
Th Vc = Tc Vb
-1
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V = d V a
-1
Which means that
Vc Vb = Vd Va
Now also from the isothermal parts of the carnot cycle:
This is an important result. Temperature can be de