This document provides a summary of key concepts in physical chemistry in 3 sentences or less: The document outlines fundamental concepts such as the laws of thermodynamics, kinetic molecular theory, ideal gases, real gases, phase diagrams, and transport properties. Key equations are presented for the ideal gas law, van der Waals equation of state, Maxwell-Boltzmann distribution, diffusion, heat transfer, and more. Definitions and examples are given for important terms like state functions, work, heat, entropy, heat capacity, compression factor, and diffusion coefficients.

1. Dr. Lauth, University of Applied Sciences, Jülich Campus
Physical Chemistry
Formulary
The Laws of thermodynamics hold
William
Thomson
(Lord Kelvin;
1824 – 1907)
“when you can measure what you are speaking about,
and express it in numbers, you know something about it;
but when you cannot measure it,
when you cannot express it in numbers,
your knowledge is of a meagre and unsatisfactory kind”
E=E°+RT/F ln([Ox]/[Red])
k=Aexp(E/RT)
G=-RTln(K)
pV=nRT
r=k[A]a
[B]b
pi=xip*
dn/dt=-ADdc/dx
a=a[A]/([A]+K)

2. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 1
Basic Concepts
System
 A system is a particular segment of the world
(with definite boundaries); outside the system
are the surroundings (system & surroundings =
universe)
 A system may be open (boundary permeable to
matter and heat), closed (boundary permeable to
heat) or isolated (boundary impermeable)
 The condition or state of a system is
determined by a number of properties
- intensives properties do not change with the
quantity of matter present (p, T, , xi, Vm, Um…)
- extensive properties do change with the
quantity of matter (m, n, V, U, S, G…)
 These properties are state functions: they
depend only on the current state of the system,
not on the way in which the system got to that
state.
Mathematically: State functions form exact
differentials.
GIBBS´ Phase Rule
 F: "degrees of freedom" ; number of intensive
variables (T, p, c, ...) that must be fixed in order
for the condition of a system at equilibrium to
be completely specified
 C: number of (independent) components
 P: number of phases
Phase Diagram for a
One-Component System
A plot representing the phases of a substance as a
function of temperature and pressure, showing
 one phase regions (s, l, g)
 two phase regions (s/l, l/g, s/g)
 critical point
(above which vapor cannot be liquefied by
pressure)
 triple point
(three states of a substance are present)

3. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 2
Thermodynamic Process / Work and Heat
Process
 A thermodynamic process is defined as a system
preceeding from an initial state to a final state.
 Work and Heat are no state functions but
process quantities because they describe the
transition between states
Work W [J]
 Convention: positive sign of W (W>0) indicates
that the system´s energy is increasing
 The work accompanying a change in volume is
called „pV work“ = WVol
WVol = - p dVex
(pex[Pa]: external pressure)
Heat Q [J]
 Convention:
positive sign of Q = endothermic process
negative sign of Q = exothermic process
Heat Capacity C [J/K]
 Heat capacity is the heat required to raise the
temperature of a substance by 1 K
 Index „p“: process occuring at constant pressure
 Index „V“: process occuring at constant volume
Td
Q
=C;
Td
Q
=C V
Vp
p 
Specific and Molar Heat Capacity c
[J/(kg K)] , Cm [J/(mol K)]
c =
C
m
c =
C
m
p
p
V
V
C =
C
n
C =
C
n
p,m
p
V,m
V
(m[kg]: mass; n[mol]: moles)
Examples (25°C / 1 bar):
Substance H2 N2 H2O C2H5OH Ag Fe Si SiO2 CDia
(g) (g) (l) (l) (s) (s) (s) (s) (s)
Cp,m [JK-1
mol-1
] 28,82 29,12 75,29 111,5 25,35 25,1 28,09 44,4 6,113
Standard State (index °) definitions:
- For a gas the standard state is a pressure of 1 bar (p°)
- For a substance present in a solution, the standard state is a concentration of 1 mol/L (c°)
- For a liquid or solid substance, the standard state is a molar fraction of 1 (pure substance)
nitial state Final state
Ti pi Vi Tf pf Vf
Work
Heat

4. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 3
Ideal Gases
Equation of State of an Ideal Gas
TRn=Vp
(p [Pa]: pressure; V[m³] volume; T [K] temperature; n[mol] moles; R = 8,314 J/(mol K) universal gas constant)
GAY-LUSSAC´s Law (CHARLES´s Law)
The volume of a given sample of gas at constant
pressure is directly proportional to the temperature
in Kelvins
T
K273,15
V
=V 0
BOYLE-MARIOTTE´s Law
The volume of a given sample of gas at constant
temperature varies inversely with the pressure
AVOGADRO´s Hypotheses
Equal volumes of gases at the same temperature
and pressure contain the same number of particles
Examples (273 K; 101325 Pa = 1 atm):
Gas (ideal) N2 H2 O2 He CO2 NH3 C2H6
(g) (g) (g) (g) (g) (g) (g)
Vm [10-3
m3
mol-1
] 22,414 22,40 22,43 22,39 22,43 22,26 22,40 22,17
DALTON´s Law of Partial Pressures
 For a mixture of gases in a container, the total
pressure exerted is the sum of the pressures that
each gas would exert if it were alone
py=pp=p total
i
total iii
(y [mol/mol]: molar fraction of component „i)
Composition of dry air (mean molar mass M = 28,96 g/mol):
N2 O2 Ar CO2
Vol.-%
(Weight %)
78,09
(75,52)
20,95
(23,14)
0,93
(1,29)
0,03
(0,05)
const.=Vp
const.)=p(T,const.=V=
n
V
m

5. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 4
Kinetic-Molecular Theory I
Postulates of the kinetic molecular theory of ideal gases:
 The volume of the individual particles can be assumed to be negligible
 The particles are assumed to exert no forces on each other
Pressure p [Pa] and
Temperature T [K] of a Gas
The collisions of the particles with the walls of the
container are the cause for the pressure exerted by
the gas
p =
1
3
N
V
m v1 2
(N [] : number of molecules; m1
[kg] : mass of a molecule; v² [m²/s] : mean-square
velocity)
The average kinetic translational energy of a
collection of gas is assumed to be directly
proportional to the Kelvin temperature of the gas
trans
Atransm,B
N=UTk
2
3
=trans EE
(kB = 1,38110-23
J/K : BOLTZMANN constant; R = 8,314 J/(mol K): gas constant ; NA
= 6,022 1023
1/mol : Avogadro´s number; N []: number of particles; Utrans [J] internal
translational kinetic enrergy ; Um [J/mol] : molar translational kinetic energy)
MAXWELL-BOLTZMANN Distribution Law
d N
N d v
=
2 M
R T
v exp -
M v
2 R T
2
2













3
2 M
R
=
m
k
1
B
(N [] : number of particles; M [kg/mol]: molar mass; R = 8,314 J/(mol K): gas constant; v [m/s] : velocity)
average velocity
v =
8 R T
M
most probable velocity
v =
2 R T
M
h
square root of the mean square velocity
v =
3 R T
M
2
Examples:
Gas N2 He H2 Cl2 CO2 NH3 O2 Hg Ar
v [m s-1
] (298 K) 475 1256 1770 298 379 609 444 177 398

6. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 5
Kinetic-Molecular Theory II
Cross Section of Collision  [m²]
 = 4 r2
Mean Free Path ̅ [m]
 The average distance a molecule in a given gas
sample travels between collisions with other
molecules
̅
√
(r [m] : (mean) radius of particle, C = N/V [1/m³]: concentration of particles; p[Pa] : pressure; T [K] : temperature; kB = 1,38110-23
J/K : BOLTZMANN constant)
Collision Frequency zt [1/s] of
Intermolecular Collisions
̅
̅
(v [m/s] mean velocity, ̅ [m] mean free path)
Collisions of Gas Particles with the
Container Wall zW [1/(m²s)]
z =
1
4
C vW
(v [m/s] mean velocity, C [1/m³] = N/V concentration of
particles )
Examples (293 K, 1 bar):
Gas N2 H2 CO2 O2 Ar
m [10-10
m] 600 1123 397 647 635
zt [109
s-1
] 5,07 10,0 6,1 4,4 4,0
BOLTZMANN Distribution and Barometric Distribution Law
 The ratio of the populations in two energy states
E1 and E2 (distribution of thermal energy on
energy states)
N N
E
E E2 1
 





exp
k TB

Applied to gas molecules in earth atmosphere
p ph
 





0
exp
M g h
R T
(M [kg/mol]: (mean) molar mass; h [m]: height; g = 9,81 m/s² :
gravitational acceleration; R = 8,314 J/(mol K): gas constant)

7. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 6
Real Gases I
Compression Factor Z []
Z =
p V
R T
=
p V
n R T
m
Virial Equation
p V = A + B p + C p + D p + ...m
2 3
2. Virial Coefficient B [m³/mol] and Boyle-
temperature TB [K]
B b
RT
a
 
a
T =
R b
B
Examples :
Gas N2 CO2 Ar H2 O2
B[10-6
m3
mol-1
](273K) -10,5 -149,7 -21,7 13,7 -22,0
B[10-6
m3
mol-1
](373K) 6,2 -72,2 -4,2 15,6 -3,7
VAN-DER-WAALS Equation of State
 p +
V
V - b = R T
m
2 m
a







Covolume b [m³/mol]
b = 4 N
4
3
rA
3

Simplified VAN-DER-WAALS Equation
p V = RT + -
R T
pm b
a





(a/V²m [Pa]: internal pressure; Vm [m³/mol]: molar volume; b [m³/mol]: covolume; R = 8,314 J/(mol K): Gas constant) ,b [m³/mol]:
covolume; NA = 6,022 1023
1/mol : Avogadro´s number; r [m] radius of gas particle)
Examples:
Substance Ar N2 CO2 H2O CH4 C2H6
a [m6
Pa mol-2
] 0,1363 0,1408 0,364 0,5536 0,23 0,5562
b [10-5
m3
mol-1
] 3,219 3,913 4,267 3,049 42,9 6,38
repulsion
attraction
repulsion
attraction repulsion
attraction
repulsion
attraction

8. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 7
Real Gases II
Critical Constants pk, [Pa], Tk [K], Vm,k [m³/mol]
b3=V km,
2
27
=pk
b
a
R27
8
=Tk
b
a
)Z=(
8
3=
TR
V
k
k
km,kp
Examples:
Substance N2 H2 CO2 H2O CH4 C2H6 C5H12
Tk [K] 126,2 33,3 304,2 647,4 190,7 305,4 425,2
pk [M Pa] 3,394 1,297 7,387 22,119 4,63 4,884 3,8
Vm,k [10-6
m3
mol-1
] 90,1 65,0 94,0 56,0 98,7 148,0 255
JOULE-THOMSON Coefficient J-T [K/Pa] and Inversion Temperature Ti [K]
 When a non-ideal gas is forced through a membrane or porous plug, its temperature changes
 A gas cools on expansion at temperatures below Ti , above Ti a gas warms on expansion
 =
2
R T
-
CJ-T
p,m
a
b
T =
2
Ri
a
b
Examples:
Gas N2 He CO2 N2 H2
J-T [K bar-1
] (300 K) 0,25 -0,059 1,1 0,25
Ti [K] 621 40 1500 621 202

9. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 8
Transport Properties I - Diffusion and Heat Transfer
Diffusion (FICK´s first and
second Law)
 The rate of diffusion (the diffusive flux dn/dt) is
proportional to the concentration gradient dc/dx
 The rate of accumulation (or depletion) of
concentration is proportional to the local
curvature of the concentration gradient d²c/dx².
dx²
d²c
D
dt
dc
xd
cd
-=
A
n
D

for a perfect gas (self-diffusion)
(A[m²]: area; D [m²/s]: diffusion coefficient)
Examples:
hydrogen ethanol Sugar chloride-ion sodium-ion silver
in (T) air(301K) H2O(298 K) H2O (298 K) H2O (298 K) H2O (298 K) copper(900 K)
D[m2
/s] 710-5
1,08.
10-9
5,21.
10-10
2,03.
10-9
1,33.
10-9
1,38.
10-15
Randow-walk Equation
(EINSTEIN-SMOLUCHOWSKI
Equation)
 x² is the mean square distance traversed by a
molecule in time t
x² = 2 D t
Heat Transfer by Conduction
(FOURIER´s Law)
 The rate of flow of heat dQ/dt is proportional to
the temperature gradient dT/dtx
xd
Td
-=
A
Q
W


cCv:gasdiatomicafor mV,mW
 
[A [m²]: area; w [W/(Km)] : thermal conductivity]
Examples (273 K):
Substance N2 H2 Xe H2O H2O Cu glas wood soil concrete
(g) (g) (g) (l) (s) (s) (s) (s) (s) (s)
w [WK-1
m-1
] 0,024 0,1682 0,0052 0,600 0,592 393 ~0,7 ~0,1 ~0,35 ~1,3

10. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 9
Transport Properties II - Viscosity
Viscosity
(NEWTON´s Law of Viscous Flow)
 The frictional force F (resisting the relative
layers in the fluid) is proportional to the area A
and to the velocity gradient dvy/dx
(applies only to laminar flow)
xd
vd
-=
A
Y
V

F
 Application: rotating-plate viscosimeter
 v
2
1
=:gasperfectafor mV
(F [Pa]: frictional force; A [m²]: area;  = F/A [Pa]: shear
stress; dvy/dx [1/s]: shear rate)
Examples:
Substance N2 (g) H2 (g) Ar(g) H2O (l) EtOH (l) Hg (l) H2SO4 (l)
298K 298K 273 K 293K 273K 298K 298K 293 K 298 K
V [mPas] 0,018 0,0087 0,021 0,0223 1,8 1,009 1,19 1,55 21,6
HAGEN-POISEUILLE Equation
 The viscosity V can be calculated from
measurements of the rate of flow dV/dt in a tube
of known dimensions (l, r), if the pressure
difference p is known
d V
d t
=
r
l
p
4
V

8

 Application: extrusion viscosimeter
STOKES´s Law
 The frictional force Fd opposing the motion of a
large spherical particle of radius r moving at
speed v through a solvent of viscosity V is
given by STOKES´s law
F = 6 r vR V 
 Application: falling ball viscosimeter

11. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 10
The First Law of Thermodynamics
Internal Energy U [J], including
 The kinetic energy of motion of the individual
molecules (rotation, vibration, translation)
 The potential energy that arises from
interactions between molecules
 The kinetic and potential energy of the electrons
within the individual molecules (chemical
bonds, etc.)
U = + E )kin pot
(E
First Law of Thermodynamics
 The energy of the universe is constant
 Applied to closed systems:
change of internal energy =
heat absorbed by the system +
work done on the system
Enthalpy H [J]
H = U + p V
Processes at Constant Volume
 Increase of internal energy U of a system at
constant volume is equal to the heat QV that is
supplied to it
V
V
T
T
T
U
C 





  TdC=U=Q
2
1
21
T
VTV


Processes at Constant Pressure
 Increase of enthalpy H of a system at constant
pressure is equal to the heat Qp that is supplied
to it
p
p
T
T
T
CH 





 
H
TdC==Q
2
1
21
T
pTp


Phase Transitions
(at constant pressure)
 The enthalpy change that occurs to melt a solid
at its melting point =
Molar enthalpy of fusion: fH = Qp,sl / n
 Molar enthalpy of vaporization:vH = Qp,lg / n
Examples:
Substance Ar H2O C6H6 Ag
fH [kJ/mol] (at TE) 1,188 (83,8 K) 6,008 (273,1 K) 10,59 (278,6 K)) 11,3 (1234 K
vH [kJ/mol] (at TS) 6,51 (87,3 K) 40,656 (373,1 K) 30,8 (353,2 K) 250,6 (2436 K)

12. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 11
Thermochemistry I - Basics
Stoichiometric Equation of a Chemical Reaction
   A B C DA + B C + D
A, B: reactants C, D: products
Stoichiometric Coefficients i reactants < 0 products > 0  i i = 0
Extent of Reaction  [mol] d  = d ni / i ( = 0: reactants only; =1 products only)
Enthalpies of Formation H°f,i [J/mol]
 Change in enthalpy („Heat“) that accompanies the formation of 1 mole of a compound from its elements
(with all substances in their standard state)
Examples (298 K, 1 bar):
compound N2 H2O H2O CO2 CO NH3 NO C2H4 C6H6
(g) (l) (g) (g) (g) (g) (g) (g) (l)
H0
B [kJ mol-1
] 0 - 285,84 -241,83 -393,51 -110,52 -46,19 90,37 52,3 49,03
more examples see appendix
Enthalpy of Reaction RH° [J/mol]
 Heat associated with a chemical reaction at
constant pressure rH can be calculated from
the enthalpies of formation of the reactants and
products
 Enthalpy and energy changes are considered
with reference to the extent of reaction;
stoichiometric equation must be specified

i
if,
o
i
o
H=H r
 0
reactantsf,
0
productsf, H-H= 
Energy of Reaction RU [J/mol]
 Heat associated with a chemical reaction at constant volume; rU can be calculated from rH
     r r r r r rH = U + (p V) H = U + R T ngaseous
(R = 8,314 J/(mol K) : gas constant Rngaseous: change in moles of gaseous products and reactants)
HESS´s Law
 The enthalpy of reaction is not
dependent on the reaction pathway
RH = 0
d H = 0



13. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 12
Thermochemistry II - Calorimetry
Enthalpy of Combustion cH [J/mol]
 Amount of heat produced for the complete combustion of a substance (at constant pressure)
Examples :
compound H2 CH4 C2H4 C4H10 CH3OH C8H18 C12H22O11
(g) (g) (g) (g) methanol(l) i-octan(l) saccharose(s)
cH [kJ mol-1
] - 286 -890 -1411 - 2877 -726 -5461 -5645
Measurement of Enthalpy Changes (Calorimetry)
 Direct measurement of rH or indirect calorimetry (application of Heß´s law)
 Indirect calorimetry: determination of enthalpies of formation HB,i from enthalpies of combustion cH
  icproductscombustionf,, H-H=ifH
KIRCHHOFF´s Law
 Temperature dependence of enthalpies of
reaction can be calculated from the heat
capacities of the reactants and products




H
T
= C
H = H + C dT
i p,i
i
T T
T
T
i p,i
i
2 1
1
2

 
R
R R

 
Enthalpy of Atomization - Hf,at [J/mol]
 Heat to be supplied at constant pressure in order
do dissociate all the molecules into gaseous
atoms
 atomsfgifiatf HHH ,)(,,,
Bond Enthalpy Hbond
 The bond enthalpie or bond strenth is an average quantity
 bondiatf HH ,,
Examples:
Bond O-H C-H C-C C=C CC C-O C-N C=O N-H
(ketone)
Hbond [kJ mol-1
] -463 -416 -340 -615 -815 -340 -296 -750 -390

14. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 13
Second Law of Thermodynamics - Entropy
Second Law of Thermodynamics
 The entropy of the universe tends towards a
maximum (while the energy of the universe is a
constsant)
Suniverse  0
 In any spontanous irreversible process (occuring
without outside intervention) there is always an
increase in the entropy of the universe
Suniv., irrev. > 0
 In reversible processes the entropy of the
universe remains constant
Suniv., rev. = 0
Entropy S [J/K]
 measure of randomness or disorder; increase in entropy means an increase in disorder
Microscopic Definition of Entropy (BOLTZMANN´s Equation)
 entropy is related to thermodynamic probabiltiy W, the number of microstates corresponding to a given state
(including both position and energy)
S = k ln(W)B
(kB = 1,38110-23
J/K: BOLTZMANN constant; W []: thermodynamic probability)
Macroscopic Definition of Entropy
Change S (CLAUSIUS)
 S =
Q
T
d S =
Q
T
rev rev
(Qrev [J] heat absorbed or released during a reversible process; T [K] temperture)
Third Law of Thermodynamics
(NERNST´s Heat Theorem)
 The entropies of a perfect crystal at 0 K is zero
S = 0crystalline, pure, 0 K
Absolute Entropies S°i [J/(mol K)]
 The more complex the molecule, the higher the
standard entropy value
Examples: (1 bar, 298 K)
Substance Si N2 N2O4 H2O H2O SiCl4 SiF4 CO2 C6H6
(s) (g) (g) (l) (g) (l) (g) (g) (l)
S0
i [J K-1
mol-1
] 18,82 191,5 304,3 69,94 188,72 239,32 282,14 213,64 172,8
more examples see appendix

15. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 14
Entropy and Energy Conversion
Temperature Dependence of Entropy
 S =
C
T
d TT T
p
T
T
1 2
1
2
 
(Cp [J/(mol K)] : molar heat capacity)
Entropy Changes Associated with
Changes of Aggregation State
entropy of fusion: 

f
H
S =
T
f
.E
;
entropy of vaporization:

v
v
S
S =
T
H
Examples:
Substance Ar N2 O2 Cl2 H2O CH3OH C6H6 CH3COOH
fS [J/(K mol)] (at TE) 14,17 11,39 8,17 37,22 22,00 18,03 38,00 40,4
vS [J/(K mol)] (at TS) 74,53 75,22 75,63 85,38 109,0 104,6 87,19 61,9
Concentration Dependence of Entropy (Expansion; Dillution)
 S = n R ln
V
V
V V
2
1
1 2






(n [mol] :moles; R = 8,314 J/(K mol): gas constant)

Entropy Changes in Chemical Reactions RS° [J/(K mol)]
 rS can be calculated from the absolute entropies of the reactants and products
 Stoichiometric equation must be specified
   RS = S = S -0
i i
0
i
product
0
reactant
0

CARNOT Cycle
 The efficiency C of the reversible CARNOT
engine can be defined as the work done by the
system during the cycle Wrev, divided by the
heat absorbed at the higher temperature Q1
Q
W
=
1
rev
C
T
T-T
=
Q
W
1
12
1
rev
0WQQ rev21 

16. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 15
Free Enthalpy and Equilibrium
Free Enthalpy (GIBBS Energy) G [J]
 At constant temperature and pressure, systems
tend to move toward a state of minimum
GIBBS energy G  H - TS (= second law of
thermodynamics for constant T and p)
 rG = G/ is a measure for the tendency of
a reaction to occur; the more negative the
value of rG, the further a reaction will go to the
right to reach equilibrium
 rG can be calculated from standard reaction free enthalpy rG° and reaction ratio Qr
  R R RQG = G + RT ln0
 i
iR a=
][Reactants
[Products]
=Q i
Reactants
Products



 The standard reaction free enthalpy rG° can be calculated from standard reaction enthalpy rH° and
standard reaction entropy rS° (sometimes called GIBBS-HELMHOLTZ equation)
  R R RG = H - T S  
 Equilibrium of a reaction is established when
rG = 0 (minimum GIBBS energy); the reaction
ratio has a particular value - the thermodynamic
equilibrium constant KGG
 i
i
GG
GG
a=
][Reactants
[Products]
=K i
Reactants
Products



GG
 The equilibrium constant K can be calculated from the standard reaction free enthalpy rG°
 R
G = - R T ln Ko
 K = exp -
G
R T
o
R





Examples: (298 K)
reaction N2 + 3 H2  2 NH3 H2O  H+
+ OH -
K 6,8105
bar-2
1,010-14
mol²/l²
reaction CH3COOH  CH3COO-
+ H+
AgCl  Ag+
+ Cl -
K 1,810-5
mol²/l² 1.610-10
mol²/l²

17. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 16
Shifts of Equilibrium
Exergonic Reations Endergonic Reactions
 RG° < 0 RG° > 0
 KGG > 1 KGG < 1
Temperature Dependence of Equilibrium Constants
 ULICH´s approximation : rG° for temperatures other than 298 K can be calculated from rH°- and rS°-
values for 298 K
  R R R
G (T) = H (298 K) - T S K)o o o
(298
Possible Combinations of H° and S° for a Process
RH° < 0 RS° > 0  exergonic (spontaneous) at all temperatures
RH° < 0 RS° < 0  exergonic at T < RH°/RS°
RH° > 0 RS° > 0  exergonic at T > RH°/RS°
RH° > 0 RS° < 0  not exergonic at any temperature
VAN´T HOFF´s Equation
 A plot of ln{K} against 1/T will have a slope
equal to H°/R
 ln K = -
H
R
1
T
+
S
R
o o
 R R
(T [K]: temperature; R = 8,314 J/(K mol) : gas constant)
Examples:
Reaction N2 + 3 H2  2 NH3 N2 + O2  2 NO
T 298 K 400 K 500 K 1000 K 3000 K
K 6,8105
bar-2
41 bar-2
3,510-2
bar-2
6,810-9
0,017
LE CHATELIER/BRAUN Principle
 If a change in conditions (a „stress“) is imposed
on a system at equilibrium, the equilibrium
position will shift in a direction that tends to
reduce that change in conditions
process „stress“ shift
RH > 0 increase in temperature product yield higher
RH < 0 increase in temperature product yield lower
RV < 0 increase in pressure product yield higher
RV > 0 increase in pressure product yield lower

18. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 17
Phase Equilibria of One-Component Systems
Vapor Pressure [Pa]
 Vapor pressure = the pressure of the vapor over
a liquid at equilibrium
 At equilibrium, the rates of condensation and
evaporation are equal (dynamic equilibrium)
Examples:
Substance H2O(s) (s/l) H2O(l) (vH = 41 kJ/mol ) | Hg(l) (vH = 59 kJ/mol)
T [°C] -10 0,0 10 25 100 150 200 | -10 25 100
p [mbar] 2,5 6,0 12,3 31,7 1 013 4 760 15 551 | 8,810-5
110-3
0,35
ANTOINE´s Equation
 Empirical equation for vapor pressure change
with temperature
(p [bar] : vapor pressure in bar; 1 bar = 100 000 Pa; T [°C]
temperature in °C ; A, B, C ANTOINE constants)
examples:
Substance benzene ethanol toluol water
A 4,2144 3,9251 4,0899 4,9513
B 1314,90 912,01 1348,21 1575,61
C 232,40 154,35 219,55 218,62
CLAUSIUS-CLAPEYRON
Equation
 The CLAUSIUS-CLAPEYRON equation represents
the vapor pressure change with temperature
 Enthalpy (“heat”) of vaporization vH is
assumed to be independent of temperature
 A “CLAUSIUS-CLAPEYRON-plot” (ln(p) versus
1/T) results in a straight line with a (-vH /R) -
slope
[ ( )]
(T1 / T2 [K] temperature corresopoding to vapor pressure p1 / p2; vH
[J/mol]: enthalpy of vaporization; R = 8,314 J/(mol K): gas constant)

19. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 18
Surface Tension
Definition of Surface Tension
 [J/m² = N/m]
 Surface Tension : the work dW necessary to
increase the surface area by dA
Ad
Wd
=
L
F
=
Examples (20 °C)
Substance H2O (l) Ethanol (l) glycerol (l) Hg (l)
 [mN m-1
] 72,8 22,3 63,0 480
YOUNG Equation and Meniscus Angle 
LG
SL-
=)(cos

 SG

([°]: meniscus angle ; SG [N/m] surface tension between solid phase and gas)
Examples (20 °C)
(l) C6H6 H2O H2O Hg Hg
(s) glas glas wax steel glas
 6° 0° 105° 154° 140°
LAPLACE Equation
 The pressure on the inside of a bubble (radius r)
must be higher than on the outside
r
2=p


convexconcave p-p=p
( [N/m] surface tension; p [Pa] Pressure difference; r [m]
radius of the surface curvature)
Capillarity
 Spontaneous rising of a wetting liquid in a
narrow tube to the height h
rg
)(cos2
=h


(: meniscus angle;  [kg/m³] density; g = 9,81 m/s² :
gravitattional acceleration; r [m]: radius of the capillary)

20. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 19
Two-Component Systems - Ideal Solutions
Ideal Solutions
 Mixture of component (A) = solvent and
component (B) = solute
 Ideal solution: Inter molecular attractions of
(A) for (A) and of (B) for (B) are the same as
the attraction of (A) for (B) { interaction (A 
B)  interactions (AA / BB) }
RAOULT´s Law
 Vapor pressure of solvent p is equal to its mole
fraction in the solution x multiplied by the vapor
pressure of the pure solvent p° (ideal solutions).
(p
A
[Pa] : vapor pressure of component A in sulution; p
A
*
[Pa] : vapor pressure of
pure component A; x
1
[]: mole fraction of component 1)
HENRY´s Law
 The molar fraction of a gas dissolved by a given
volume of solvent at constant temperature, is
propotional to the pressure of the gas in
equilibrium with the solution.
(pB [Pa]: vapor pressure of component B (gas) in solution; kH
[Pa] : Henry´s constant; x2 []: molare fraction of component 2)
Examples (25 °C)
Component „2“ (gas) N2 O2 CO2 H2 CH4 N2 CO2 H2 CH4
Solvent „1“ H2O H2O H2O H2O H2O C6H6 C6H6 C6H6 C6H6
kH [GPa] 8,68 4,4 0,167 7,12 0,0419 0,239 0,0114 0,367 0,0569
Vapor Pressure and Boiling Point of two Liquids obeying Raoult´s Law
 The total vapor pressure in a binary solution will be
intermediate between the vapor pressures of the
two pure components (no maximum or minimum in
p-x-diagram)
 The boiling points of all the mixtures are inter-
mediate between the boiling points of the pure
components

21. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 20
Colligative Properties
A colligative propery is a property of dilute solutions that depends on only the number of solute molecules and
not on the type of species present
Boiling Point Elevation
 Boiling point elevation is a colligative propery
 The molality b is the number of moles of solute
per kilogram of solvent in a solution
(bB [mol/kg] : molality ; i[]: VAN´T HOFF factor; Keb [K kg/mol]:
ebullioscopic constant)
Freezing Point Depression
 Freezing point depression is a colligative
property (RAOULT´s second law)
(bB [mol/kg] = nB/mA: molality ; i []: VAN´T HOFF factor; kkr [K
kg/mol]: cryoscopic constant)
Examples :
Solvent H2O C6H6 cyclohexane camphen acetic acid CS2 CCl4
keb [K kg/mol] 0,514 2,64 2,75 6,09 3,07 2,37 4,95
Kkr [K kg/mol] 1,86 5,07 20,2 40,0 3,90 3,8 30
Osmotic Pressure  [Pa] (VAN´T HOFF Equation)
 Osmosis: the flow of solvent into a solution
through a semipermeable membrane (permeable
for solvent molecules only)
 Osmotic pressure : the pressure that must be
applied to stop osmosis
 Molarity c: moles of solute / volume of solution
(i[] : van´t Hoff factor; cB [mol/m³]: molarity; R = 8,314 J/(mol
K) : gas constant)
Examples:
Solution 0,4 mol sugar in 1 kg water/ 20° human blood at 37 °C
 [bar] 10,3 bar 7,7 bar
Dissociation (VAN´T HOFF Factor i)
van´t Hoff Factor i: the number of particles in
solution formed from one molecule
( )
(+,- []: number of cations/anions formed from one molecule; z+,-
[]: charge of cation / anion;  []: degree of dissociation.)

22. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 21
Binary Phase Diagrams / Boiling and Melting
Negative Deviations from RAOULT´s
Law (example: acetone-chloroform)
 Interaction (A B) > interactions (AA /
BB)
 Solution „more stable“ than components
 Negative sign of mH and mV
 In case of large deviations:
Maximum in boiling point curve (azeotrope)
Positive Deviations from RAOULT´s law
(example: ethylene chloride - ethanol)
 Interaction (AB) < interactions (AA /
BB)
 Solution „less stable“ than components
 Positive sign of mH and mV
 In case of large deviations:
Minimum in boiling point curve (azeotrope)
Azeotrope (minimum or maximum in boiling point curve)
 Liquid and vapor are of the same composition; separation by direct distillation impossible
Examples:
boiling point of (1) boiling point of (2) boiling point of azeotrope
TS(H2O): 100 °C TS(HNO3) 87°C TS (69 % HNO3): 120 °C
TS(H2O): 100 °C TS(EtOH): 78,4°C TS (96 % ethanol): 78,2 °C
Eutectic (minimum in liquidus curve)
 Composition which has the lowest melting
point
 Mixture of eutectic composition (heterogeneous
!) will melt sharply at the eutectic temperature
to form a homogeneous liquid phase of the
same composition
 Invariant point: A(s) + B(s)  A/B (l)
 (Other invariant points:
 Peritectic / eutectoid / peritectoid)
Examples:
melting point of (1) melting point of (2) melting point of eutectic
TE (Si): 1685 °C TE(Al): 930 °C TE(xSi = 0,11): 851°C
TE (Sn): 232 °C TE(Pb): 327,5 °C TE(33% Pb): 183°C
TE (H2O): 0 °C TE(NaCl): 801 °C TE(23% NaCl): -21°C

23. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 22
Ternary Phase Diagrams / Triangle Diagram
General Remarks on Phase Diagrams
 Phase Diagrams are are descriptions of the
state of a system on a graph of temperature
versus composition
 Binodal Curve: Boundary between homogeneous
and heterogeneous regions in a phase diagram
(Examples: boiling , liquidus curve, solidus
curve)
 Conodal Curve (tie line in 2-phase regions):
connection line between equibilibrium phase
 Using the lever rule one can determine
quantitatively the relative composition of a
mixture in a two-phase region
 ln=ln
GIBBS´s Triangle Diagram
 In ternary phase diagrams the composition of
a phase containing up to three components is
represented on triangular axes.
 Within the two-phase regions only specific
compositions can be in equilibrium; the lines
joining these compositions are known as tie
lines .
Triangle Diagram and NERNST Distribution Law
 If two liquids A (raffinate R) and B
(extractant E) are partially immiscible
and if there is a third component C
present in both phases (which behaves
individually as an ideal solute), the
ratio of its concentrations is constant
K=
c
c
NernstR
GGC,
E
GGC,

24. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 23
Adsorption
 Adsorption: the collection of one substance on the surface of another
Surface Concentration a [mol/g] and
Fraction of Surface covered  [ ]
adsorbent
speciesadsorbed
m
n
=a
layermomoa
a

LANGMUIR Adsorption Isotherm
 Formation of a unimolecular layer at saturation
[ ]
[ ]
(K [Pa or M]: Langmuir constant; [A] [Pa] Pressure or [M] :
molarity)
 Surface areas of the sorbent can be calculated
from a (spec. area = a
.
NA
.
Aadsorbed molecule)
 In order to test the Langmuir isotherm it is best
to use a reciprocal plot (1/a versus 1/c or 1/p)
BET Adsorption Isotherm
 Extension of the Langmuir treatment (by
BRUNAUER, EMMETT AND TELLER) to allow for
the physisorption of additional layers of
adsorbed molecules
monad,
*
monad,ad
*
*
VK
p/p1)-(K
+
VK
1
=
V)p/p-1(
p/p
(K []: BET-constante; p* :saturation vapor pressure; Vmon:
volumen that can be adsorbed as a monolayer)
FREUNDLICH Adsorption Isotherm
[ ]
 In order to test the Freundlich isotherm it is
best to use a logarithmic plot (ln(a) versus
ln(c))
)ln()ln(ln(a) c 

25. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 24
Chemical Kinetics
Rate of Consumption and Formation ri [mol/(s m³)]
 The change in concentration of a reactant or
product per unit time
[ ]
Rate of Reaction r [mol/(s m³)]
Rate Law, Rate Constant and Half Life
 Rate law: an expression, which shows how the
rate depends on the concentrations of reactants
r = k f(c ,c ,c ...)A B C
often
( ) [ ] [ ] [ ]
 The proportionality constant k is called the rate
constant; the exponents a,b,c.. are called the
order of the reactant
 The form of the rate law (the values for k, a, b, c
...) must be determined by experiment
 The integrated rate law relates concentration
to reaction time:
cA = f(t)
 The time required for a reactant to reach half of
its original concentration is called the half life of
a reaction and is designated by the symbol t½
0st
order reaction

26. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 25
Simple-Order Reactions
First-Order Reaction (A  P)
 Doubling the concentration of A doubles the
reaction rate
 Half-life does not depend on concentration
 A plot of ln(cA) versus t is a straight line
A1
A
ck=
td
cd
-=r
 tk-expc=c 1A,0A
tk-cln=cln 1A,0A
t1
2
1
=
ln 2
k
Second-Order Reaction (A  P)
 Doubling the concentration of A quadruples the
reaction rate
 Half-life is dependent of cA,0
 A plot of 1/cA versus t is linear
2
A2
A
ck=
td
cd
-=r
c
k t
A
=
c
1+ c
A,0
A,0 2
1
c
=
1
c
+ k t
A A,0
2
t1
2
2 A,0
=
1
k c
Examples:
Reaction 2 N2O5  2NO2 + O2 Cyclopropane  Propene C2H6  2 CH3 2 NO2  2 NO + O2 H+
+ OH-
 H2O
25 °C (gas phase) 500 °C (gas phase) 700 °C (gas phase) 300°C (gas phase) 25 °C (in water)
k 3,1410-5
1/s 6,7110-4
1/s 5,46 10-4
1/s 0,54 dm³/(mol s) 1,5.
1011
dm³/(mol s)
Kinetics of simple order reactions
Reaction Rate Law Integrated Rate Law Half Life
A  P r = k0 k0  t = cA,0 – cA t½ = cA,0/(2k0)
A  P r = k1  cA k1  t = ln(cA,0) - ln(cA) t½ = ln(2)/k1
A  P r = k2  cA² k2  t = 1/cA – 1/cA,0 t½ = 1/(cA,0k2)
A + B  P
(cA,0 = cB,0)
r = k2  cA  cB k2  t = 1/cA – 1/cA,0 t½ = 1/(cA,0k2)
A + B  P
(cA,0  cB,0)
r = k2  cA  cB k2t = 1/(cA,0 – cB,0)ln(cB,0cA/cA,0cB)

27. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 26
More Complicated Mechanisms
Equilibrium Reaction ( A  P)
A reversible chemical reaction will be at dynamic
equilibrium when the rate of forward reaction is
equal to the rate of the reverse reaction.
GGA
GGp
c
c
,
,
k
k
=K 

AA EEH

R
Consecutive Reaction (A  I  P)
 The steady-state approximation (SSA)
assumes that, after an initial induction
period the rates of change of
concentrations of all unstable
intermediates are negligibly small, i.e.:
unstable intermediate
 The rate-determining step
approximation states that in a series of
consecutive elementary rections the rate
of production of the final products
depends only the rate coefficient for the
slowest step in the sequence
stable intermediate
Competitive Reaction ( P´  A  P)
Reaction 1 (-----) has a more stable transition state
and therefore a lower activation barrier. So
diamond is the kinetic product.
Reaction 2 (_____
) generates the more stable product
since graphite it is at lower energy than diamnond.
So graphite is the thermodynamic product.
Kinetic control is favoured with mild and low
temperature conditions. Thermodynamic reaction
control takes place with vigorous reaction
conditions or when the reaction is allowed to
continue over a long time

28. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 27
Influence of Temperature and Catalyst on Reaction Rates
ARRHENIUS Equation
 The rate constant k shows an exponential
increase with temperature
k = A exp
E
R T
A






(A: frequency factor; EA [J/mol] activation energy; R = 8,314 J/(mol K) gas constant)
 A plot of ln(k) against (1/T) gives a straight
line („ARRHENIUS plot“); the value of the activation
energy can be obtained from the slope of the line, which
equals -EA/R; the intercept can be used to determine A.
ln( )k = ln(A) -
E
R
1
T
A
 Activation energy EA : for a reaction , mole-
cules must come together with at least EA in order
to surmount the energy barrier (threshold energy)
 Frequency factor A (preexponential factor):
rate constant at very high temperture
Examples:
Reaction 2 N2O5 2NO2 + O2 cyclopropane propene sucrose  fructose + glucose
1. order, gas phase 1. order, gas phase 2. order; aqueous solution
EA 88 kJ/mol 272 kJ/mol 107,9 kJ/mol
A 6,311014
1/s 1,581015
1/s 1,5 1015
dm³/(mol s)
Collision Theory and
Activated Complex
 Molecules must collide to react
(reaction rate = number of successfull collisons)
 The relative orientation of the reactants
must allow formation of any new bonds
necessary to produce products (steric factor =
fraction of collisions with effective orientation)
 The collision must involve enogh energy
to form the activated complex (transition state)
Catalysis
 A catalyst is a substance that increases the rate
of reaction without being consumed itself
 A catalyst does not modify the overall
thermodynamics (H, G, S) of the reaction
 A catalyst provides a new pathway with lower
activation energy for the reaction
Reaction 2 HI H2 + I2
catalyst (none) Au(s) Pt(s)
EA [kJ/mol] 184 105 59

29. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 28
Electrochemistry - Solutions of Electrolytes
Dissociation of Electrolytes
 Strong electrolytes occur almost entirely as
ions in solution; degree of dissociation   1
 Weak electrolytes are present only partially as
ions;  << 1
K A K + A+ -
+ -
+
z
-
z
   
n = z = - ze + + - - 
( [] dissociation number of cation / anion; z [] : charge number of
cation / anion; ne [] : elektrochemical number)
Conductivity E [S/m]
 Product from conductance (G [S] = 1/R) and
cell constant (C = d/A)
A
d
R
1
=E
E
i=1=
E
( [m] : specific resistance; E [V/m]: electric field ; R [] resistance,
d[m] distance between electrodes; A[m²] area of electrode)
Molar Conductivity m and Equi-
valent Conductivity  [Sm²/mol]
m
=
c
E

 =
c n
E
e

(c [mol/L]: molarity; ne []: electrochemical number)
Examples (25 °C, unless otherwise stated):
Substance Cu Fe NaCl (l) KCl 1M KCl 0,1 M ZrO2/Y(s) H2O
850 °C 750 °C
E [S/cm] 580000 96100 3,66 0,098 0,00112 0,01 4,41.
10-8
KOHLRAUSCH´s Law of Independent Migration of Ions -
Ion Conductivities  [Sm²/mol]
 Each ion is assumed to make its own
contribution to the molar conductivity,
irrespecitve of the nature of the other ion with
which it is associated
Examples (infinite dilution):
Ion H+
Na+
K+
Ca2+
OH-
Cl-
NO3
-
SO4
2-
CH3COO-
 [cm²/( mol)] 349,7 50,1 73,5 59,5 197,0 76,4 71,5 80,0 40,9

30. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 29
DEBYE-HÜCKEL-Theory
Ionic Strength I and Ionic Cloud
 The ionic strength I of a solution is a
function of the concentration of all ions
present in a solution.
i
i
2
i cz
2
1
I 
 Solutions that contain ionic solutes do
not behave ideally even at very low
concentrations. DEBYE AND HÜCKEL
introduce the concept of an ionic cloud:
Each ion attempts to surround itself
with oppositely charged ions. The
radius of the ionic cloud depends on the
ionic strength of the solution
I
1
nm0,304=rI 
Activity a and DEBYE-HÜCKEL limiting law
 The effective concentration – the
activity a - is proportional to the
concentration by the
activity coefficient 
c= iiia
 The DEBYE-HÜCKEL limiting law
enables one to determine the activity
coefficient of an ion in a dilute solution
of known ionic strength.
Izz5091,0)log( -+


31. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 30
Electrochemistry - Conductivity
Ionic Velocity v [m/s] and Ionic Mobility u [m²/V s]
 The mobility u of an ion is defined as the speed with which the ion moves under a unit potential gradient.
 The mobility can be calculated from ion conductivities
v = u E v = u E+ + - -
= F u = F u+ -  
(E [V/m]: electric field)
Examples (infinite dilution):
Ion H+
Na+
K+
Ca2+
OH-
Cl-
NO3
-
SO4
2-
CH3COO-
u [10-4
cm²/(Vs) 36,23 5,19 7,62 6,17 20,64 7,91 7,4 8,29 4,34
Variation of Equivalent Conductivity  with Concentration
a) Strong Electrolytes
(KOHLRAUSCH´s Law)
 Electrophoretic effect: the ion and its
ionic atmosphere move in different directions
 Asymmetry effect: the ionic atmosphere
around a moving ion is not symmetrical
 = - const. c
b) Weak Electrolyte (OSTWALD´s Dilution Law)
 conductivity is proportional to the degree of
dissociation 
 =   K = c
2

( )1
 


1
c
1
=
1
2
K
( []: degree of diss.;  [Sm²/mol] : equivalent conductivity at molarity c
[M];  [Sm²/mol] : equivalent conductivity at infinite dilution)

32. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 31
Electrochemistry - Electrodes
Electron Transfer Reaction
Half-reactions occuring at the interface between an
electrode and the solution:
 Oxidation (transfer of electrons to the metal) occurs
at the anode [Ox]anode + e e-
 [Red] anode
 Reduction (transfer of electrons to the electrolyte)
occurs at the cathode [Ox]cathode + e e-
 [Red] cath
NERNST Equation - Electrode Potential at Zero Current
 The potential of a single electrode Eredox is
dependent on concentration
 
 red
ox
red
ox
e
o
redox
a
a
ln
F
TR
+E= 

redoxE
(R=8,314 J/(mol K) : gas constant; e []: number of electrons in electron
transfer reaction; F= 96 485 C/mol : Faraday constant)
Standard Electrode Potentials E°
React. Cl2+2e-
2Cl-
Ag+
+e-
Ag Fe3+
+e-
Fe2+
Cu2+
+2e-
Cu Zn2+
+2e-
Zn
E°redox 1,36 V 0,80 V 0,77 V 0,34 V - 0,76 V
Combinations of Electrodes - Cell Potential E [V] („EMF“)
 The cell potential at zero current (electromotive
force „emf“ E) is the potential difference
beween the cathode and the anode
 The galvanic cell runs spontaneously in the
direction that give a positive value for E
 The process of electrolysis involves forcing a
current throgh a cell to produce chemical
change for which the cell potential E is negative
E = E - Eredox,cathode redox, anode
 S, H and G values can be calculated, if emf
measurements are made over a range of
temperature
R
G = - F Ee

R
S = F
E
T
e









R
H = - F E - T
E
T
e









(RH [J/mol] : enthalpy of reaction; RS [J/(K mol)] : entropy of reaction; RG [J/mol]
: free enthalpy of reaction; E [V]: electromotive force emf; e []: number of electrons
transferred for every unit of reaction; F= 96 485 C/mol : Faraday constant)
Reference Electrodes and Potentials:
electrode Diagram potential
standard hydrogen electrode (SHE); Pt/H2(1 bar), H+
(a= 1mol/l) E = 0,00 V
calomel electrode, saturated; Hg/Hg2Cl2, KCl (sat.) E = 0,241 V
silver chloride electrode, saturated; Ag/AgCl, KCl (sat.) E = 0,197 V
Galvanic Cell

33. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 32
Electrochemistry - Electrolysis
FARADAY´s Law of Electrolysis
 The mass of an element produced at an electrode is
proportional to the quantitiy of electricity passed
through the liquid and proportional to the
equivalent weight of the element
m =
I t M
F e
(m [kg]: mass; I [A] : current; t [s] : time; M [kg/mol] : molar mass;
F = 96 495 C/mol: FARADAY constant; e []: number of electrons in
electron transfer reaction)
Liquid Junction (Diffusion) Potential and Membrane Potential
At the liquid junction of two different electrolytes the ions have different mobilities t+ and t-. The movement of
the ions across this boundary generates a current flow and hence a potential (junction or diffusion potential
diff; membrane potential mem, if the junction is permeable only to one kind of ion)






 
2
1
+
c
c
ln)(t
Fz
TR
-= tdiff







2
1
c
c
ln
Fz
TR
-=mem

34. Physical Chemistry / EquationS and Data / Prof. Dr. G. J. Lauth / university of applied sciences
Standard Enthalpies and
Entropies (1 bar; 25 °C)
M Cp,m HB,i S°i
g/mol J/(mol K)) kJ/mol J/(molK
Ag (s) Silver 107,87 25,351 0 42,69
Ag+
(aq) Silverion107,87 105,90 73,93
AgCl (s) Silver
chloride
143,32 50,79 - 127,03 96,10
AgBr (s) Silver
bromide
187,78 52,38 - 99,5 107,1
AgI (s) Silver
iodide
234,77 54,43 - 62,4 114,2
Ag2S (s) Silver
sulfide
247,80 76,40 - 29,3 150,2
Al (s) Aluminium26,98 24,35 0 28,31
Al3+
(aq)Aluminiumion
26,98 - 524,7 - 313,4
Al2O3 (s,) Al.
oxide
101,96 79,04 - 1675 50,94
Ba (s) Barium137,34 28,07 0 64,85
Ba2+
(aq)
Bariumion
137,34 - 538,4 11
BaSO4 (s) Barium
sulfate
233,40 101,75 - 1465 131,8
Br2 (l) Bromine159,82 75,689 0 152,3
Br2 (g) Bromine159,82 36,02 30,7 245,4
Br (g) Bromine
atom
79,91 20,786 96,44 174,9
Br-
(aq) Bromide
ion
79,91 - 120,9 80,7
Cgraphite (s) Carbon12,011 8,527 0 5,694
Cdiamond (s) Carbon12,011 6,113 1,896 2,378
C (g) Carbon atom12,011 20,838 718,38 157,99
CCl2O (g) Phosgen98,92 - 223 289
CHO3
-
(aq)
Hydrogencarbonat
2
61,02 - 691,1 95
CH2O (g)
Formaldehyde
30,03 35,40 - 116 219
CH4 (g) Methane16,04 35,31 - 74,8 186,2
CH3OH (l)
Methanol
32,04 81,6 - 238,6 126,8
CH3OH (g)
Methanol
32,04 43,89 - 201,2 237,7
CH3NH2 (g)
Methylamine
31,06 53,1 - 28 242
CO (g) Carbon
monoxide
28,011 29,14 - 110,52 197,91
CO2 (g) Carbon
dioxide
44,010 37,11 - 393,51 213,64
CO3
2-
(aq)
Carbonate Ion
60,01 - 676,3 - 53
C2Ca (s) Carbide64,10 62,3 - 62,8 70,3
C2H2 (g) Ethyne
(=acetylen)
26,04 43,93 226,7 200,8
CH3CN (g)
Acetonitril
41,05 88,91 87,7 243
C2H4 (g) Ethene (=
Ethylen)
28,05 43,56 52,30 219,5
CH3CHO (g)
Acetaldehyde
44,05 57,3 - 166,35 265,7
C2H6 (g) Ethane30,07 52,63 - 84,68 229,5
C2H5OH (l)
Ethanol
46,07 111,46 - 278 161
C2H5OH (g) 46,07 65,44 - 235 282
Ethanol
CH3OCH3 (g)
Dimethyl ether
46,07 170,7 - 185 267
CH3COOH (l)
Acetic acid
60,05 124,3 - 484,5 159,8
CH3COOH (aq)
Acetic acid
60,05 - 485,76 178,7
CH3COO-
(aq)
Acetate
59,05 - 486,01 86,6
CH3COCH3 (l)
Acetone
58,08 124,7 - 248 200
CH3COCH3 (g)
Acetone
58,08 - 216 295
C3H8 (g) Propane44,10 73,5 - 103,85 269,9
(CH3)3N (g)
Trimethylamine
59,11 - 46,0 289
M Cp,m HB,i S°i
g/mol J/(mol K) kJ/mol J/(molK)
C4H8 (g) 1-Butene56,11 85,65 1,17 301,4
C4H8 (g) cis-2-
Butene
6,11 78,91 - 5,70 300,8
C4H8 (g) trans-2-
Butene
56,11 87,82 - 10,06 296,5
C4H10 (g) n-Butane58,13 97,45 - 124,73 310,0
C4H10 (g)
Isobutane
58,13 - 131,60 294,6
C5H12 (g) n-
Pentane
72,15 120,2 - 146,4 348,4
C6H6 (l) Benzene78,12 136,1 49,03 172,8
C6H6 (g) Benzene78,12 81,67 82,93 269,2
C6H12 (g)
Cyclohexane
84,16 156,5 - 123,1 298,2
C6H12 (g) 1-
Hexene
84,16 - 41,7 386,0
C6H14 (l) Hexane86,18 - 199,2 285,8
C6H14 (g) Hexane86,18 143,1 - 167,2 386,8
C6H12O6 (s) -D-
Glucose
180,16 - 1274
C6H5COOH (s)
Benzoic acid
122,13 146,8 - 385,1 167,6
C8H18 (l) n-Octane114,23 -249,9 361,1
C10H8 (s)
Naphthalene
128,18 165,5 78,53
C12H22O11 (s)
Saccharose
342,3 - 2222 360,2
Ca (s) Calcium0,08 25,31 0 41,62
Ca2+
(aq) Calcium
ion
40,08 - 543,0 - 55
CaO (s) Calcium
oxide
56,08 42,80 - 635,5 39,7
CaCO3 (s)Calcit -
carbonat
100,09 81,88 - 1206,9 92,9
Ca(OH)2 (s) Ca-
hydroxide
74,09 84,5 - 986,2 83,4
Cl2 (g) Chlorine70,91 33,91 0 223,0
Cl (g) Chlorine
atom
35,45 21,840 121,1 165.09
Cl-
(aq) Chloride
ion
35,45 - 167,4 55,1
HCl (g) Hydrogen
chloride
6,46 29,12 - 92,31 186,7
Cu (s) Copper63,54 24,44 0 33,30
Cu2+
(aq) Copper
(II) ion
63,54 64,4 - 98,7
Cu+
(aq) Copper63,54 52 - 26

35. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 34
(I) ion
CuI (s) Copper(I)
iodide)
190,44 54,1 68,2 96,6
CuSO4 (s) Copper
sulfate
159,60 100,0 - 771,36 109
CuSO45 H2O(s) -
hydrate
249,68 280 - 2279,7 300,4
F2 (g) Fluorine38,00 31,3 0 202,7
F (g) Fluorine
atom
19,00 22,74 79,09 158,6
F-
(aq) Fluoride
ion
19,00 - 329,1 - 9,6
HF (g) Hydrogen
fluoride)
20,01 29,13 - 268,5 173,7
Fe (s) Iron 55,85 25,10 0 27,15
Fe2+
(aq) Iron(II)
ion
55,85 - 88 - 113
Fe3+
(aq) Iron(III)
ion
55,85 - 48 - 293
M Cp,m HB,i S°i
g/mol J/(mol K) kJ/mol J/(molK)
H2 (g) Hydrogen2,016 28,824 0 130,6
H (g) Hydrogen
atom
1,008 20,784 217,94 114,6
H+
(aq) Hydrogen
ion
1,008 0 0
H2O (l) Water18,015 75,291 - 285,84 69,94
H2O (g) Water18,015 33,58 - 241,83 188,72
Hg (l) Mercury200,59 27,983 0 76,09
Hg (g) Mercury200,59 20,786 60,8 174,9
Hg2
2+
(aq)
Mercury ion
401,18 169 74
Hg2Cl2 (s) Hg
chloride
472,09 102 - 264,8 195,7
I2 (s) Iodine253,81 54,44 0 116,14
I2 (g) Iodine253,81 36,90 62,24 260,6
I (g) Iodine atom126,90 20,786 106,6 180,7
I-
(aq) Iodide ion126,90 - 55,9 109,4
HI (g) Hydrogen
iodide
127,91 29,158 25,94 206,3
K (s) Potassium39,10 29,58 0 64,35
K (g) Potassium39,10 90,04 160,2
K+
(aq) Potassium
ion
39,10 - 251,2 102,5
Mg (s)
Magnesium
24,31 24,89 0 32,55
Mg2+
(aq)
Magnesium ion
24,31 - 462,0 - 118
MgO (s)
Magnesium oxide
40,31 37,15 - 601,2 26,8
Mn (s) Manganese54,938 26,32 0 31,76
Mn2+
(aq)
Manganese ion
54,938 - 219 - 83
MnO (s)
Manganese(II)oxid
e
70,94 42,97 - 348,8 59,71
Mn3O4 (s) Mn-
(II,III)oxide
228,81 139,7 - 1386 149,5
MnO2 (s) Mn-
(IV)oxide
86,94 57,2 - 519,7 53,1
MnO4
-
(aq)
Permanganate
118,94 - 518 190
N2 (g) Nitrogen28,013 29,125 0 191,5
N(g) Nitrogen14,007 20,786 470,6 153,1
atom
N2O (g) Din-
monoxide
44,01 38,45 81,55 220,0
NO (g) Nitrogen
monoxide
30,01 29,844 90,37 210,6
NO2 (g) Nitrogen
dioxide
46,01 37,20 33,32 239,8
N2O4 (g) Din-
tetroxide
92,01 77,28 9,368 304,3
NO3
-
(aq) Nitrate
ion
62,01 - 206,6 146
NH3 (g) Ammonia17,03 35,06 - 46,19 192,5
NH4
+
(aq)
Ammonium ion
18,04 - 132,8 112,8
NH4Cl (s) A-
chloride
53,49 84,1 - 315,39 94,6
HNO3 (l) Nitric
acid
63,01 109,87 - 173,0 156,1
M Cp,m HB,i S°i
g/mol J/(mol K) kJ/mol J/(molK)
Na (s) Sodium22,99 28,24 0 51,42
Na (g) Sodium
atom
22,99 108,7 153,62
Na+
(aq) Sodium
ion
22,99 - 239,7 60
NaCl (s) Sodium
chloride
58,44 49,71 - 411,1 72,12
Na2SO4 (s) Sodium
sulfate
142,04 127,82 -1384,5 149,5
O2 (g) Oxygen31,999 29,355 0 205,0
O3 (g) Ozone47,997 142,67 238,82
O (g) Oxygen atom15,999 21,912 247,52 160,9
OH-
(aq)
Hydroxide ion
17,007 -148,5 - 230 - 10,54
Pb (s) Lead 207,19 26,44 0 64,91
Pb2+
(aq) Lead ion207,19 1,6 21,4
PbO2 (s) Lead(IV)
oxide
239,19 64,64 - 276,6 76,44
PbCl2 (s) Lead(II)
chloride
278,10 76,8 - 359,1 136,4
PbI2 (s) Lead(II)
iodide
461,00 81,7 - 175,1 176,9
PbS (s) Lead(II)
sulfide
239,25 49,5 - 94,28 91,2
PbSO4 (s) Lead(II)
sulfate
303,25 104,3 - 918,1 147,2
Srhombisch (s) Sulfur32,06 22,64 0 31,8
Smonoklin (s) Sulfur32,06 23,6 0,29 32,6
S2-
(aq) Sulfide ion32,06 42 22
SO2 (g) Sulfur
dioxide
64,06 39,87 - 296,9 248,1
SO3 (g) Sulfur
trioxide
80,06 50,67 - 395,2 256,0
H2SO4 (l) Sulfuric
acid
98,08 138,9 - 811,7 156,9
HSO4
-
(aq)
Hydrogensulfate
97,07 - 885,75 126,9
SO4
2-
(aq) Sulfate
ion
96,06 - 907,5 17,2
H2S (g) Hydrogen
sulfide
34,08 34,23 - 20,15 205,6
Si (s) Silicium28,09 20,00 0 18,82
SiO (g) Silicium
monoxide
44,09 -100,42 211,47
SiO2 -Quartz(s) Si-
dioxide
60,09 44,43 -910,86 44,59
SiH4 (g) 32,12 40,67 32,64 204,13

36. Physical chemistry formulary
Dr. Lauth, University of Applied Sciences, Jülich Campus 35
Monosilane
SiF4 (g) Si-
tetrafluoride
104,08 73,6 -1614,9 282,14
SiCl4 (l) Si-
tetrachloride (
169,90 145,2 -640,15 239,32
SiCl4 (g) Si-
tetrachloride
169,90 -657,31 330,83
Snweiß (s) Tin118,69 26,99 0 51,5
Sngrau (s) Tin118,69 - 2,19 44,1
Sn2+
(aq) Tin ion118,69 - 10 - 20,5
Zn (s) Zink 65,37 25,40 0 41,59
Zn2+
(aq) Zink ion65,37 46 - 152,4 - 106,5
AVOGADRO number NA = 6,0221023
1/mol
Universal gas constant R = 8,3145 J/(mol K)
BOLTZMANN constant kB = 1,38110-23
J/K
Charge of a proton e = 1,6021810-19
C
FARADAY constant F = 96485,3 C/mol
Permittivity of vacuum 0 = 8,85410-12
C2
/(Jm)
Speed of light c = 2, 9979 108
m/s
PLANCK constant h = 6,6261 10-34
Js
Mass of an electron me = 9,10938 10-31
kg
Mass of a proton mp = 1,672610-27
kg
Acceleration of gravity g = 9,81 m/s2
Electrochemical Reduction Potentials
(p = p0
= 1 bar; c = c0
= 1 mol/L ; T = 298 K; aqueous solution)
[Ox] + e e-
 [Red] E0
redox [V]
F2 (g) + 2 e-
 2 F-
+ 2,85
S2O8
2-
+ 2 e-
 2 SO4
2-
+ 2,0
PbO2(s) + SO4
2-
+ 4 H+
+ 2 e-
 PbSO4 (s) +
2 H2O
+ 1,685
MnO4
-
+ 8 H+
+ 5 e-
 Mn2+
+ 4
H2O
+ 1,491
PbO2 (s) + 4 H+
+ 2 e-
 Pb2+
+ 2 H2O + 1,455
Ce4+
+ e-
 Ce3+
+ 1,443
Au3+
+ 3 e-
 Au (s) + 1,42
Cl2(g) + 2 e-
 2 Cl-
+ 1,358
O2 (g) + 4 H+
+ 4 e-
 2 H2O + 1,229
HCrO4
-
+ 7 H+
+ 3 e-
 Cr3+
+ 4 H2O + 1,195
Br2 (l) + 2 e-
 2 Br-
+ 1,065
AuCl4
-
+ 3 e-
 Au (s) + 4
Cl-
+ 0,994
NO3
-
+ 4 H+
+ 3 e-
 NO (g) + 2
H2O
+ 0,96
Ag+
+ e-
 Ag (s) + 0,7996
Hg2
2+
+ 2 e-
 2 Hg (l) + 0,798
Fe3+
+ e-
 Fe2+
+ 0,770
C6H4O2 + 2 H+
+ 2 e-  C6H4(OH)2 + 0,6995
I2 (s) + 2 e-
 2 I-
+ 0,535
Cu+
+ e-
 Cu (s) + 0,522
O2 (g) + 2 H2O + 4 e-
 4 OH-
+ 0,401
Cu2+
+ 2 e-
 Cu (s) + 0,340
AgCl (s) + e-
 Ag (s) + Cl-
+ 0,2223
[Ox] + e e-
 [Red] E0
redox [V]
SO4
2-
+ 4 H+
+ 2 e-
 H2SO3 (aq) +
H2O
+ 0,20
Sn4+
+ 2 e-
 Sn2+
+ 0,15
S(s) + 2 H+
+ 2 e-
 H2S (aq) + 0,141
CuI2
-
+ e-
 Cu (s) + 2 I-
+ 0,00
2 H+
+ 2 e-
 H2 (g) 0
Fe3+
+ 3 e-
 Fe (s) - 0,036
Pb2+
+ 2 e-
 Pb (s) - 0,126
Sn2+
+ 2 e-
 Sn (s) - 0,136
Ni2+
+ 2 e-
 Ni (s) - 0,23
PbSO4 (s) + 2 e-
 Pb (s) +
SO4
2-
- 0,356
Cd2+
+ 2 e-
 Cd (s) - 0,4026
Fe2+
+ 2 e-
 Fe (s) - 0,440
S(s) + 2 e-
 S2-
- 0,508
Zn2+
+ 2 e-
 Zn (s) - 0,7628
Al3+
+ 3 e-
 Al (s) - 1,66
Ce3+
+ 3 e-
 Ce (s) - 2,335
Na+
+ e-
 Na (Hg) (l) - 2,711
Li+
+ e-
 Li (Hg) (l) - 3,045
Conversion factors
Force (= mass x acceleration)
1 N = 1 kg m/s²
1 dyn = 10-5
N
1 kp = 9,806 N
Pressure (= force / area)
1 Pa = 1 N/m² = 10-5
bar
101325 Pa = 1 atm = 760 Torr
760 mmHg = 10,33 mWS
1 psi = 6 895 Pa
Energy (= force x distance; el. work
= charge x voltage)
1 J = 1 N m = 1 m³ Pa
1 erg = 10-7
J
1 eV = 1,602110-19
J
1 eV = 96 494 J/mol
1 cal = 4,184 J
Power (= work / time)
1 W = 1 J/s
1 kWh = 3600000 J/s
1 hp = 745,7 W

37. Index (D = Data, Examples)
1. Ficksches Gesetz Fick´s first Law 8
1. Hauptsatz der Thermodynamik 1. Law of Thermodyn. 16
2. Hauptsatz der Thermodynamik 2. Law of Thermodyn. 19
2. Raoultsches Gesetz Raoult´s Second Law 13
2. Virialkoeffizient 2. Virial Coefficient (D) 6
3. Hauptsatz der Thermodynamik 3. Law of Thermodyn. 19
A
Absorption Absorption 31
Adsorption Adsorption 15
Aktivierungsenergie Activation Energy EA 26
Anode Anode 29
Antoine Gleichung Antoine Equation (D) 10
Äquivalent Leitfähigkeit Equivalent Cond.  27
Arbeit Work 2
Arrhenius-Gleichung Arrhenius Equation (D) 26
Asymmetrieeffekt Asymmetry Effect 28
atom. Bildungsenthalpie Enth. of Atomization 18
Azeotrop Azeotrope 14
B
barometrische Höhenformel Barometric Distrib. Law 5
Bedeckungsgrad Fraction of Surface Cov. 15
BET-Isotherme BET Adsorption Isoth. 15
Beweglichkeit Ionic Mobility u (D) 28
Bildungsenthalpie Enth. of Formation HB 17
Bindungsenthalpie Bond Enthalpy 18
Binnendruck Internal Pressure 7
BOLTZMANN Verteilung BOLTZMANN Distribution 5
BOLTZMANNsche Entropieformel BOLTZMANN´s Equation 19
Boyle-Mariottesches Gesetz Bolye-Mariotte´s Law 3
Boyle-Temperatur Bolye-Temperature 6
Brechungsindex Refraction Index n (D) 31
C
Carnotscher Kreisprozess Carnot Cycle 20
chemische Kinetik Chemical Kinetics 24
Clausius-Clapeyronsche Gleichung Clausius-Clapeyron E. 10
Couette Viskosimeter Couette Viscosimeter 9
Daltonsches Gesetz Dalton´s Law 3
Dampfdruck Vapor Pressure 10
D
Dichte Densitry 1
Diffusion Diffusion 8
Diffusionskoeffizient Diffusion Coefficient 8
Dissoziation Dissociation 13
Driftgeschwindigkeit Ionic Velocity 28
Druck Pressure 1
Durchlässigkeit Transmittance T 31
Durchtrittsreaktion Electron Transfer Reac. 29
E
Einstein-Smoluchowski-Gleichung Einstein-Smoluchowski 8
elektrische Leitfähigkeit Electrolytic Cond.  27
Elektrochemie Electrochemistry 27
Elektroden Electrodes (D) 29
Elektrodenpotential Electrode Potential (D) 29
Elektrolyse Electrolysis 29
elektrolytische Dissoziation Dissociation of Electrol. 27
elektrolytische Lösungen Solutions of Electrolytes 27
Elektromagnetisches Spektrum Electromagnetic Sp. 31
Elektromotorische Kraft Electromotive Force E 29
elektrophoretischer Effekt Electrophoretic Effect 28
EMK EMF 29
endergonische Reaktionen Endergonic Reactions 22
Enthalpie Enthalpy H 16
Enthalpiemessungen Enthalpy Measurements 18
Entropie Entropy S 19
Eutektikum Eutectic 14
exergonsiche Reaktionen Exergonic Reactions 22
Extinktion Absorbance E 31
Extinktion Extinction E 31
F
Faradaysches Gesetz Faraday´s Law 30
Fouriersches Gesetz Fourier´s Law 8
Freie Energie Free Energy A 21
Freie Enthalpie Free Enthalpy G 21
Freiheitsgrad Degree of Freedom 1
Frequenzfaktor Frequency Factor A (D) 26
G
Galvanische Zellen Galvanic Cell 29
Gay-Lussacsches Gesetz Gay-Lussac´s Law 3
Gefrierpunktserniedrigung Freezing Point Depr. 13
Gesamtdampfdruck Total Vapor Pressure 12
Geschwindigkeitsgesetz Rate Law 24
Geschwindigkeitskonstante Rate Constant 24
Gesetz von Charles Charles´s Law 3
Gibbs Energie Gibbs Energy G 21
Gibbs-Helmholtz-Gleichung Gibbs-Helmholtz Equ. 21
Gibbssche Phasenregel Gibbs´ Phase Rule 1
Gleichgewicht Equilibrium 21
Gleichgewichtskonstante Equilibrium Constant K 21
H
Hagen-Poiseuillesches Gesetz Hagen-Poiseuille Equ. 9
Halbwertszeit Half-life 24
Helmholtz Energie Helmholtz Energy A 21
Henrysches Gesetz Henry´s Law (D) 12
Heßscher Satz Heß´s Law 17
I
ideale Lösungen Ideal Solutions 12
ideales Gas Ideal Gas 3
individuelle Reaktionsgeschw. Rate of Consumtion ri 24
individuelle Reaktionsgeschw. Rate of Formation ri 24
Innere Energie Internal Energy U 16
Inversionstemperatur Inversion Temperature 7
Ionenleitfähigkeit Ion Conductivity  (D) 27
isobare Prozesse Process at const. Press. 16
isochore Prozesse Process at const. Vol. 16
J
Joule-Thomson-Koeffizient Joule-Thomson Coef. 7
K
Kalorimetrie Calorimetry 17
Kapillarität Capillarity 11
Kapillarviskosimeter Capillary Viscosimeter 9
Katalysator Catalyst (D) 26
Katalyse Catalysis (D) 26
Kathode Cathode 29
Kelvin Gleichung Kelvin Equation 11
kinetische Energie Kinetic Energy 4
kinetische Gastheorie Kinetic-Molecular The. 4
Kirchhoffsches Gesetz Kirchhoff´s Law 18
Kohlrauschsches -Gesetz Kohlrausch´s  Law 28
Kohlrauschsches Gesetz Kohlrausch´s Law 27
Kolligative Eigenschaft Colligative Property 13
Kombination von Elektroden Comb. of Electrodes 29
Komponente Component 1
Kompressionsfaktor Compression Factor 6
Konduktion Conduction 8
Konjugierte Base Conjugate Base (D) 23
Konvektion Convection 8
Konz.-abhängigkeit der Entropie Entropy; Conc.-Dep. 20
Kovolumen Colvolume (D) 6
kritische Daten Critical Constants (D) 7
kritischer Punkt Critical Point 1
Kugelfallviskosimeter Falling-ball Viscosim. 9
L
Lambert-Beersches Gesetz Lambert-Beer Law 31
Langmuir-Isotherme Langmuir´s Ads. Isoth. 15
Laplacesche Gleichung Laplace Equation 11
Le Chateliersches Prinzip Le Chatelier Principle 22
Lichtstreuung Light Scattering 31
Liquiduslinie Liquidus Curve 14
Löslichkeit Solubility cs 23
Löslichkeitsprodukt Solubility Product KL 23
Luft Air (D) 3
M
Maxwell-Boltzmann-Verteilung Maxwell-Boltzmann D. 4
mittlere freie Weglänge Mean Free Path  (D) 5
mittlere Geschwindigkeit Average Velocity (D) 4
mittleres Geschwindigkeitsquadrat Mean-Square Velocity 4
mittleres Verschiebungsquadrat Mean Square Dist. x² 8
Molalität Molality b 13
molare Leitfähigkeit Molar Conductivity m 27
molare Wärmekapazität Molar Heat Capacity 2
neg. Abweichungen v. Raoult Neg. Deviations Raoult 14

38. N
Nernstsche Gleichung Nernst Equation 29
Nernstscher Wärmesatz Nernst´s Heat Theorem 19
Newtonsches Gesetz Newton´s Law (visc.) 9
Normalentropien Absolute Entropies S° 19
O
Oberfläche Surface Area 15
Oberflächenspannung Surface Tension 11
Osmose Osmosis 13
osmotischer Druck Osmotic Pressure  (D) 13
Ostwald Viskosimeter Ostwald Viscosimeter 9
Ostwaldsches Verdünnungsgesetz Ostwald´s Dilution Law 28
P
Partialdruck Partial Pressure 3
Phase Phase 1
Phasendiagramm Phase Diagramm 1
Phasenumwandlungen Phase Transitions (D) 16
Phasenumwandlungsentropien Entropy; Phase Trans. 20
Polarimetrie Polarimetry 31
Polarisiertes Licht Polarized Light 31
Pos. Abweichungen v. Raoult Pos. Deviations Raolt 14
Präexponentieller Faktor Preexp. Factor A (D) 26
R
Random-walk Gleichung Random-walk Equation 8
Randwinkel Meniscus Angle 11
Raoultsches Gesetz Raoult´s Law 12
Rayleighsches Gesetz Rayleigh´s Law 31
Reaktionen 1. Ordnung First-Order Reaction (D) 25
Reaktionen 2. Ordnung Second-Order Reac. (D) 25
Reaktionen einfacher Kinetik Simple-Order Reactions 25
Reaktionsenergie Energy of Reaction rU 17
Reaktionsenthalpie Enthalpy of React. rH 17
Reaktionsgeschwindigkeit Rate of Reaction r 24
Reaktionsordnung Reaction Order 24
Reaktionsquotient Reaction Ratio QR 21
Reaktionsstand Extent of Reaction  17
reale Gase Real Gas 6
reale Lösungen Real Solutions 14
Reatkionsentropie Reaction Entropy 20
Referenzpotential Reference Potentials (D) 30
S
Satz von Avogadro Avogadro´s Hypotheses 3
Säurekonstante Acid Diss. Constant 23
Schergeschwindigkeit Shear Rate 9
Schubspannung Shear Stress 9
schwache Elektrolyte Weak Electrolytes 27
Siedelinie Boiling Point Curve 14
Siedepunktserhöhung Boiling Point Elevation 13
spez. Wärmekapazität Specific Heat Capacity 2
spezifische Leitfähigkeit Specific Cond.  (D) 27
Standardzustand Standard State (°) 2
starke Elektrolyte Strong Electrolytes 27
Stefan-Boltzmannsches Gesetz Stefan-Boltzmann´ Law 8
stöchiometrische Gleichung Stoichometric Equation 17
stöchiometrische Umsatzzahlen Stoichiometric Coeff. 17
Stoffmengenkonzentration Molarity c
Stokesches Gesetz Stokes´s Law 9
Stoßfrequenz Collision Frequency (D) 5
Stoßquerschnitt Cross Section of Coll. 5
Stoßtheorie Collision Model (D) 26
Strahlung und Materie Radiation and Matter 31
System System 1
T
Temp.-abhängigkeit der Entropie Entropy; Temp.-Dep. 20
Temp.-Abhängigkeit von K Temperature Dep. of K 22
Thermochemie Thermochemistry 17
thermodyn. Wahrscheinlichkeit Thermodynamic Prob. 19
Translationsenergie Translational Energy 4
Transporteigenschaften Transport Properties 8
Tripelpunkt Triple Point (D) 1
U
Ubbelohde Viskosimeter Ubbelohde Viscosimeter 9
Ulichsche Näherung Ulich´s Approximation 22
Umgebung Surroundings 1
unabhängige Ionenwanderung Independent Migration 27
V
van´t Hoffsche Gleichung van´t Hoff´s Equation 22
van´t Hoffscher Faktor van´t Hoff´s Factor i 13
van-der-Waalssche Gleichung van-der-Waals Equ. (D) 6
Verbrennungsenthalpie Enth. of Combustion 18
Verdampfungsenthalpie Enth. of Vaporization 10
Verschiebung von Gleichgewichten Shifts of Equilibrium 22
Viralgleichung Virial Equation 6
Viskosität Viscosity (D) 9
W
Waldensche Regel Walden´s Rule 28
Wärme Heat 2
Wärmekapazität Heat Capacity 2
Wärmeleitfähigkeit Thermal Conductivity 8
Wärmestrahlung Radiation (heat transfer) 8
Wärmetransport Heat Transfer 8
Wellenlänge Wavelength 31
Wellenzahl Wave number 31
Wiensches Verschiebungsgesetz Wien´s Law 8
Wirkungsgrad Efficiency  20
Y
Young Gleichung Young Equation (D) 11
Z
Zellspannung Cell Potential E 29
Zustand Condition 1
Zustand State 1
Zustandsgröße Property 1
Rudolf Clausius
(1822 – 1888)
The energy of the universe is constant.
The entropy of the universe tends toward a
maximum.
Heat death of the universe is inevitable!