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25 Cards in this Set

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  • Back
First law of thermodynamics
You cant win.
Total energy of universe is constant, it cannot be created or destroyed, only transformed from one form to another
Second Law of thermodynamics
All processes tend to run in the direction that leads to maximum disorder
You cant break even
Total energy
q+w
Expanding gases ...
cool
Compressing gases
warm
Isobaric process
constant pressure,
area under graph = work
Isochoric
constant volume, work = 0
Isothermal
constant temperature, work = area under curve
Adiabatic process
no heat is transfered between system and environment
Positive entropy
Randomness increases
Negative entropy
Randomness decreases
Entropy for liquids , solids , gases
Gases>liquids>solids
Enthalpy
measure of heat energy that is released or absorbed when bonds are broken and formed in a rxn with constant pressure
When a bond is formed, energy...
Released
When a bond is broken
Energy must be put in
heat of formation, Hf
Amount of energy needed to make 1 mole of compound from pure natural elements
Standard state conditions
298 K (25 C) and 1 atm
Change in Gibbs Free Energy
G= H - TS
-H, +S
- G, spontaneous
+H, +S
at high temp -G, spontaneous
at low temp +G, non spontaneous
-H, -S
at high temp + G, non spontan
at low temp -G, spontaneous
+H, -S
+ G, non spontaneous
Is thermodynamics same as kinetics
NO
thermodynamics - STABILITY
kinetics - RATE
Spontaneeous reaction favors
products
Non spontaneous reaction favors
reactants