W4 Flashcards
1
Q
What is entropy
A
Measures how chaotic a system is. More disorder = more entropy
TriangleS = products - reactants
Always JK-1mol-1
Reactions occur in direction of increasing disorder
2
Q
S =
Ssys =
Ssur =
Stot =
A
S = entropy
Ssys = system
Ssur = surroudings
Stot = total
3
Q
What is Stot
A
Stot = Ssys + Ssur
4
Q
What is 1st law thermo
A
If a reaction will occur
5
Q
What is 2nd law thermo
A
Tell us if reaction will be spontaneous
6
Q
Calculate entropy change when 1mol water is formed under standards conditions at 298k. H2O is -286kj
A
Convert -> 286x10^3J / 298k = 960jk-1
7
Q
3rd law thermo
A
A pure perfect crystal at 0K had 0 entropy
8
Q
What is gibbs
A
△G = △H - T△S
9
Q
When is gibbs spontaneous
A
When less than 0
10
Q
Solubility equation
A
lns = ( △Hsol / RT ) + C
11
Q
Solubility equation
A
lns = ( △Hsol / RT ) + C
