Diffusion

Question 1

What is diffusion?

Answer 1

Diffusion is the movement of particles from an area of high concentration to an area of low concentration.

Question 2

Why does diffusion happen in solutions and gases?

Answer 2

Because the particles in these substances are free to move about randomly.

Question 3

The ______ the difference in concentration, the ______ the diffusion rate.

Answer 3

BIGGER + FASTER

Question 4

Only very small molecules can diffuse through cell membranes, like… (give 4 examples)

Answer 4

Oxygen, Glucose, Amino acids and Water.

Question 5

What are two big molecules that cannot fit through the cell membrane?

Answer 5

Starch and Protein.