6) Thermodynamics Flashcards
1
Q
E) Energy change in system
A
ΔE = Q + w
Q- heat gained (+) or lost (-)
w- work on (+) or by (-)
2
Q
E) Heat change
A
ΔQ = CΔT
3
Q
E) Work
A
W = -PΔV
4
Q
E) Enthalpy
A
H = E + PV
5
Q
E) Hesses rule
A
ΔH = sum of H for products - sum of H for reactants
6
Q
E) Entropy change
A
ΔS = ΔQ/T
7
Q
E) All 4 Gibbs free energy
A
ΔG = ΔH - TΔS
ΔG = ΔGstandard + RTlnQ
ΔG = -RTlnK @ equilibrium
ΔG = Sum of G for products - sum of G for reactants
8
Q
D) Spontaneous reactions
A
+ve ΔH
-ve ΔS
+ve ΔG
9
Q
D) Non-spontaneous reactions
A
-ve ΔH
+ve ΔS
-ve ΔG
10
Q
D) spontaneous at low temp
A
-ve ΔH
-ve ΔS
+/- ΔG
11
Q
D) spontaneous at high temp
A
+ve ΔH
+ve ΔS
+/- ΔG
