L4: Diffusion.

Question 1

What is the definition of diffusion?

Answer 1

It is the movement of particles from a region where they are at a higher concentration to a region where they are at a lower concentration. This process doesn’t require energy.

Question 2

Why is diffusion important in respiration - gas exchange?

Answer 2

Because in breathing, you exchange carbon dioxide and oxygen between the lungs and the blood vessels. This is an example of diffusion.

Question 3

Why is diffusion important in photosynthesis?

Answer 3

Carbon dioxide diffuses in through the stomata. Oxygen and water diffuse out of the stomata.

Question 4

When can diffusion occur?

Answer 4

In gases, liquids and (more complicatedly) in solids.

Question 5

In terms of diffusion, what happens when a tea bag goes into boiling water?

Answer 5

The tea in the tea bag will diffuse and dissolve the boiling water as the tea bag has a high concentration of tea whereas the water has no concentration of tea, resulting in the high concentration of tea to go to the area with a low concentration of tea.

Question 6

Does diffusion occur faster in hot or cold water and why?

Answer 6

In hot water because the hot water has more kinetic energy than the cold water.