Diffusion

Question 1

When particles are left on their own what do they do?

Answer 1

They move randomly.

Question 2

What is Diffusion?

Answer 2

Diffusion is the net movement of particles form a area of higher concentration to a area of lower concentration.

Question 3

Note:

Answer 3

Diffusion only occurs in gases and liquids.

Question 4

Is Diffusion a active or passive process?

Answer 4

Diffusion is a passive process in the sense that energy is not required for it to take place.

Question 5

Note:

Answer 5

Diffusion occurs across the cell membrane.

Question 6

List three factors that affect the rate of diffusion and How they do.

Answer 6

• Concentration:
  The larger the concentration
  gradient the higher the rate of
  diffusion.
• Temperature:
  The higher the temperature,
  the higher the rate of diffusion.
• Surface Area:
  The larger the surface area the
  higher the rate of diffusion.

[Read or Elaborate further depending on the marks]

Question 7

How does diffusion happen across a cell membrane?

Answer 7

Lets say outside the cell membrane has a higher concentration than inside the cell membrane. The particles will move inside the cell membrane due to diffusion.

Note: Only tiny particles like amino acids, water, glucose etc. can pass through the cell membrane.