Physical chemistry Flashcards
1
Q
When are q and W negative and positive
A
q - negative when heat is lost from a system
q - positive when heat is gained into a system
w - negative when the thing does work
w - positive when work is done on the thing
2
Q
When does dU = dQ?
A
AT constant volume, not constant pressure
3
Q
Kd
A
(R1xR2)/(P1xP2)
4
Q
Work equation
A
Work = force x distance
5
Q
Change in internal energy
A
Change in internal energy = heat + work
6
Q
Gibbs energy
A
H - TΔS
H - enthalpy
T - temperature (k)
ΔS - entropy
7
Q
Rate of reaction equations (Arrhenius)
A
K = Ae⁻ᴱᵃ/ᴿᵀ
lnK = -Ea/R x 1/T + lnA
y = m x + c
-Ea/R = gradient
1/T = x-value
lnA = y-intercept
