B1: Diffusion

Question 1

diffusion definition

Answer 1

the spreading out of particles from an area of high concentration to an area of a lower concentration

Question 2

where and why does diffusion happen?

Answer 2

Diffusion happens in liquids and gases because their particles move randomly from place to place.

Question 3

diffusion in the cell membrane (2)

Answer 3

• Dissolved substances can move in an out of cells by diffusion
• only very small molecules can diffuse through cell membranes such as oxygen, glucose, amino acids and water

Question 4

factors affecting diffusion (3)

Answer 4

• temperature
• surface area
• concentration gradient

Question 5

how does temperature impact diffusion of molecules

Answer 5

Higher temperatures increase the energy and movement of the molecules, increasing the rate of diffusion

Question 6

how does concentration difference impact diffusion

Answer 6

diffusion is faster if there is a big difference in concentration between the area, the substance travels to,and the area it moves to

Question 7

how does concentration gradient impact diffusion

Answer 7

diffusion is faster if there is a big difference in concentration between the area, the substance travels to. and the area it moves to