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Chemistry 1202 Review/Preview
Chapter Five Review Guide
Dr. Saundra McGuire
Spring 2007
Thermochemistry
I.
Definitions to Know and Understand
System, Surroundings,
Energy, Temperature, Heat, Potential Energy, Kinetic Energy,
Work
II.
Heat and Energy
A.
Potential Energy  the amount of stored energy.
B.
Kinetic Energy = 1/2 mv
2
, where m is in kilograms and v is in meters/second.
The units of the energy value derived in this manner is the joule.
III.
Work
1.
Work = Force x distance
, where force = pressure x area.
The force due to gravity = mass x gravitational constant (9.8 m/s
2
).
IV.
Internal Energy and the First Law of Thermodynamics
A.
First Law of Thermodynamics  The total internal energy of an isolated
system is constant.
B.
State Functions  Functions whose value depends only on the present state of
the system, not on the path used to arrive at the state.
V.
Relating
∆
E to heat and work
A. The first law of thermodynamics is mathematically stated as follows:
∆
E
= q + w
where q is the heat exchanged and
w is the work done.
The sign conventions for work and heat are as follows:
Work done on the system is positive;
work done by the system is negative
Heat entering the system is positive;
heat going out of the system is
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This note was uploaded on 03/23/2011 for the course CHE 1201 taught by Professor Staff during the Summer '09 term at UC Davis.
 Summer '09
 Staff
 Thermochemistry

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