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Physical chemistry Test 1
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Work Formula
F*dl
Work Units
kg m^2/s^2
Kinetic Energy
.5 mu^2
Relatino betwene work and energy
w = E_kf-E_ki
Kinetic Energy
Energy posessed by a body by virtue of being in mostion
Potential ENergy
Energy posessed by a body by virtue of position
System
A specific segmentof hte world with deffinite boundaries on which we focus our attention
Surroundings
The part of the world immediately surrounding a system
Universe
System and its surroundings
Open system
Can transfer heat and material
Closed system
Can only transfer heat
Isolated system
Can transfer neither heat nor matter
Intensive property
Not a function of quantity
Extensive propety
Directly a function of quantity
Equation of state
An equation that describes the condition of a system as a function of intensive properties
Equilibrium
The systems variables of state are not changing with respect to time
Heat
The kinetic energy of molecualr motion
Zeroeth law of thermodynamics
If A and B are in thermal equilibrium
And B and C are in thermal Equilibrium
Then A and C are in thermal Equilibrium
Boyles Law
Applies under Isothermic Conditrions. If temperature and nubmer of mols are held constant then PV=Constant
Isotherm
Temperature is held constant
Isobaric
Pressure is held constant
Gay-Lussacks Law
If Pressure and mols are fixed then V/T =Constant
m is?
mass
M is?
Molar Mass
Ideal Gas Law
PV=nRT
3 Assumptions of ideal gas law
1) gas is assumed to be composed of individual particles whose actual dimensions are small in comparison to the distance between them.
2) These particles are in constant motion and therefore have kinetic energy.
3) Neither attractive nor repulsive forces exist between the particles.
N
Number of molecules present
Pressure in terms of mean square speed
P=
Average Kinetic Energy of a molecule in a system
e=.
Partial Pressure
Pressure exerted by a single component of a gas mixture. Defined by molar fraction* pressure total
Grahms law of Effucsion
R
Collision frequency
How many collisions pe second does a molecule experieince
units
: 1/s
Collision Density
How many colisions per unit of second per volume occur?
Mean free path
How far a molecule travels before a collision
distnace
u
mp
Most probable velocity. Peak of maxwell curve
z
Compression factor
=
z>1
Repulsive forces dominate (b term from nonideal gas)
Z<1
Attractive forces dominate (a term)
Van Der Waals equation
Uses a to account for attraction and b to account for repulsion
Author
Anonymous
ID
132761
Card Set
Physical chemistry Test 1
Description
Physical chemistry test 1
Updated
2/4/2012, 8:35:47 AM
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