Diffusion

Question 1

What is diffusion

Answer 1

it is the spreading out of particles from an area of higher concentration to an area of lower concentration

Question 2

where does diffusion happen

Answer 2

in solutions and gases

Question 3

what is the simplest type of diffusion

Answer 3

when different gases diffuses through each other

Question 4

how is the rate of diffusion be effected

Answer 4

-the concentration gradient (the difference in concentration of the particles)
-the surface area (the larger surface area the faster the rate of diffusion because more particles can pass through
-the temperature
-the thickness of the cell membrane

Question 5

the bigger the concentration gradient…

Answer 5

the faster the diffusion
because the next movement from one side is greater

Question 6

Name four molecules that can diffuse through a cell membrane

Answer 6

glucose, amino, acids and water

Question 7

how does the increase in temperature affect the rate of diffusion

Answer 7

the higher the temperature, the faster the rate of diffusion
because the particles have more energy so move around faster

Question 8

does osmosis require energy

Answer 8

no

Question 9

explain how different factors affect the rate of diffusion

Answer 9

distance (if it’s small, the diffusion is faster, particles don’t have as far to travel)
surface area (the larger the surface area the higher the number of particles that will be able to move in a given time so the faster the rate)
concentration (diffusion is faster if there is a big difference in the concentration

Question 10

why do single celled organisms not need specialised exchange but multicellular organisms do

Answer 10

single-celled creatures have a very high surface-area-to-volume ratio, so have lots of available surface to exchange substances.