diffusion, osmosis and active transport xx

Question 1

whats diffusion?

Answer 1

the movement of particles from an area of high concentration to that of a low concentration (down the concentration gradient’)

Question 2

how can the rate of diffusion be increased?

Answer 2

-surface area
-temp
-difference in concentrations

Question 3

whats active transport?

Answer 3

the movement of particles through a membrane via carrier proteins.

Question 4

what does active transport require?

Answer 4

requires energy, so can move them against the concentration gradient

Question 5

whats osmosis?

Answer 5

the diffusion of water across a semi-permeable membrane to balance the concentrations of solution inside and outside a cell.

Question 6

why must water move in osmosis?

Answer 6

as larger molecules cannot fit. through the holes, water. move in the. concentration is higher outside

Question 7

whats the osmosis practical?

Answer 7

-weight, and place identical cylinders from the same vegetable in sugar solutions of varying concentrations
-after set time, remove excess water and reweigh. calculate % change in mass
-plot % change in mass against concentration. using the lobf, the concentration at 0% change in mass is the same as inside the vegetable

Question 8

how do you calculate change in mass?

Answer 8

(final mass - initial mass)/ initial mass x100