Diffusion And Fick's Law

Question 1

What is diffusion?

Answer 1

The net movement of particles from an area of high concentration to an area of low concentration, down a concentration gradient

Question 2

Name the 3 factors which the rate of diffusion across a membrane.

Answer 2

1) Surface area
2) Concentration gradient
3) Diffusion distance

Question 3

What is Fick’s Law?

Answer 3

Rate of diffusion (inversely proportional) Area of diffusion surface
x diff. in concentration
———————————————-
Thickness of surface of diffusion

Question 4

Rate of diffusion and surface area are…

Answer 4

Directly proportional

If one increases, so does the other (higher rate of diffusion)

Question 5

Rate of diffusion and concentration difference are…

Answer 5

Directly proportional

Substances diffuse faster if there is a big difference between the concentration in the area they are diffusing from and to

Question 6

Rate of diffusion and thickness of membrane are…

Answer 6

Inversely proportional

Substances diffuse quicker, if they haven’t got to move as far

Question 7

What is concentration?

Answer 7

The amount of substance in a certain volume of a mixture

Question 8

What are the common units for concentration?

Answer 8

g/cm3

Question 9

What is the equation to calculate concentration?

Answer 9

Concentration= mass of solute (g) / volume of solution (dm3)

gdm-3