cram diffusion

Question 1

diffusion

Answer 1

change in spatial distribution of particles because of random thermal motion

Question 2

brownian motion

Answer 2

random walk of particles resulting from collision with other particles

Question 3

particle

• flow rate
• flow density

Answer 3

I = N/t (1/s)
J= I/A(1/m^2*s)

Question 4

matter

• flow rate
• flow density

Answer 4

I=v/t (mol/s)

J=I/A (mol/m^2*s)

Question 5

ficks first law

Answer 5

Diffusion occurs in response to a concentration gradient expressed as the change in concentration due to a change in position

J = -D*(c/x)

Question 6

Diffusion coefficient

Answer 6

D gives the amout of matter diffuse over unit area over unit time in case of concentration gradient.

Question 7

Einstein-Stokes

Answer 7

law for spheres

see stokes in Formula sheet

Question 8

ficks second law

Answer 8

change of the concentration gradient in time

Question 9

energy flow density/fourier law for heat conduction

Answer 9

J = E/(A*t)

Question 10

thermodiffusion -> Ludwig- Soret effect

Answer 10

J = -L * (T/x)

t-high>t low

Question 11

osmosis

Answer 11

one way diffusion of the solvent. in stead of difference in concentration of solvent there is a hydrostatic/osmotic pressure.

Question 12

osmotic concentration

Answer 12

The concentration of a solution that keeps balance with a heterogeneous solution.