diffusion and osmosis

Question 1

what is diffusion?

Answer 1

the (random) movement of gas/liquid particles from a high concentration to a low concentration.

Question 2

which direction does diffusion happen in?

Answer 2

down a concentration gradient

Question 3

in living things, where does diffusion happen?

Answer 3

between cells

Question 4

is energy needed for diffusion?

Answer 4

this process is passive (energy is not needed)

Question 5

what is the role of a cell membrane in diffusion?

Answer 5

cell membrane is a selectively permeable membrane, it allows certain molecules to pass through, but not others

Question 6

how long does diffusion happen for?

Answer 6

till they are evenly distributed

Question 7

what is osmosis?

Answer 7

the diffusion of water molecules from a high concentration to an area of low water concentration, through a selectively permeable membrane.

Question 8

what does a low concentration of water mean?

Answer 8

a high concentration of solute