Diffusion

Question 1

Define diffusion.

Answer 1

The gradual movement of particles from places where there are lots of them to places where there are fewer of them.
IN OTHER WORDS
spreading out particles from a high concentration to a low concentration.

Question 2

Where does diffusion happen and why?

Answer 2

Solutions and gases because these substances are free to move about randomly.

Question 3

Define concentration gradient.

Answer 3

The difference in concentration.

Question 4

list 2 ways of how the diffusion rate become faster.

Answer 4

1. If it has a higher temperature it will have a faster diffusion rate because the particles have more energy so they move faster.
2. If there is a larger surface area of the membrane, there will be a faster diffusion rate as particle pass through at once.

Question 5

Dissolved substances can movie in and out of cells.

How?

Answer 5

Only very small molecules can diffuse through cell membranes, e.g. oxygen ( for respiration), glucose, amino acids and water.
However, big molecules like strach and protein cannot fit through the membranes.