SB8b Factors affecting diffusion

Question 1

How do you calculate the concentration of a solution in g dm−3?

Answer 1

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

Question 2

What happens to the number of particles as you go down a concentration gradient?

Answer 2

they decrease.

Question 3

Is the rate of diffusion directly or inversely proportional to the concentration difference?

Answer 3

directly proportional.

Question 4

What happens to particles in diffusion when surface area of a membrane is increased?

Answer 4

they have more space to pass through so diffusion is faster.

Question 5

What happens to the rate of diffusion when further particles have to diffuse?

Answer 5

the rate slows down.

Question 6

Is rate of diffusion directly or inversely proportional to the thickness of the membrane?

Answer 6

inversely proportional (increasing the thickness of a membrane decreases the rate of diffusion).

Question 7

What does Fick’s law show?

Answer 7

.the relationship between the variables that affect diffusion
.rate of diffusion ∝ surface area x concentration difference/thickness of membrane