diffusion

Question 1

diffusion

Answer 1

the spreading out of particles from an area of high concentration to an area of low concentration

Question 2

what states of matter does diffusion occur in and why?

Answer 2

liquids and gases as the particles in those substances are free to move around

Question 3

give two examples of diffusion

Answer 3

1. oxygen diffuses from the lungs into the blood
2. carbon dioxide diffuses from the blood into the lungs
3. urea diffuses from kidney cells into blood plasma

Question 4

what effect does the concentration gradient have on diffusion?

Answer 4

the bigger the concentration gradient, the faster the diffusion rate

Question 5

what effect does the temperature have on diffusion and why?

Answer 5

it will increase the diffusion rate because the particles will have more energy so will move faster

Question 6

what effect does the surface area have on diffusion and why?

Answer 6

the larger the surface area of the membrane, the fast the diffusion rate as more particles can pass through at once

Question 7

give 4 examples of small molecules that can diffuse through cell membranes

Answer 7

1. oxygen
2. glucose
3. amino acids
4. water

Question 8

how do dissolved substances move in and out of cells?

Answer 8

they diffuse through the cell membrane

Question 9

3 main factors affecting diffusion

Answer 9

-concentration gradient
-temperature
-surface area

Question 10

how are single celled organisms adapted for diffusion?

Answer 10

large surface area to volume ratio which maximises diffusion rate

Question 11

what is a concentration gradient?

Answer 11

the difference in concentration between two areas

Question 12

will oxygen move out of a cell faster if it has a higher or lower concentration?

Answer 12

lower concentration