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33 Cards in this Set
- Front
- Back
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Ideal gas law assumes |
No IMF atoms/molecules occupy no space |
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IMF real gases feel as a function of seperation |
Back (Definition) |
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Ideal gas limiting law |
Works best if p—-> 0 |
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Z is compression factor |
For ideal gas Z = 0 Attractive forces Z < 1 Repulsive forces Z > 1 |
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Ideal gas works best when? |
Between 200-10,000 k and below 10 atm |
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Vm=? |
V/n |
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When do atoms feel IMF |
High pressures and low temps |
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When does ideal gas work best |
Larger seperation |
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Z (compression factor) |
Z=(pVm/RT)=(pv/nRT) |
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Viral equation |
-Accounts for multiple atoms pVm=RT(1+ B/Vm+C/Vm^2....) B and C are known at several temps |
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Van der waal equation |
-addresses assumptions of ideal gas law P=(nRT/(V-nb))-a (n^2/V^2) A accounts for IMF and B accounts for volume atoms occupy |
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System |
All materials involved in process being studied |
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Surroundings |
Everything else in universe not the system |
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Open system |
Matter and energy can move between system and surroundings |
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Closed system |
Matter cannot move between system and surroundings but energy can |
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Isolated system |
System that cannot exchange matter or energy between system and surroundings |
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Adiabatic |
Boundary that does not transfer heat |
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Diathermal |
Boundary that does transfer heat |
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Energy |
-ability to do work -transfered as heat or work |
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Work |
Energy transfer by coordinated movement of matter |
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Heat |
Increase in random motion of matter |
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U |
-internal energy,total energy of system Delta u=q+w State function |
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q and w |
Path functions. Describe how process is carried out |
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Work against contestant external pressure |
W=-Pex(Vf-Vi) |
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Free expansion in vacuum. |
Pex =0 W=0 |
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Isothermal, reversible ideal gas |
w=-nRT ln (Vf/Vi) |
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Energy transfer quantified by heat capacity |
Constant volume Cv Constant pressure Cp |
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Thermochemistry |
Study of heat flow during physical and chemical changes |
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Standard state |
Specified temp. Is the pure form at 1 bar |
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Constant volume |
W=0 |
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Adiabatic |
q=0 |
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Isothermal ideal gas |
Delta U = 0 |
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Enthalpy |
H=U+pV |
