Question 7
(a) Define diffusion
(b) State two factors that affect the rate of diffusion
Observation
Candidates were to define diffusion but majority ended up defining osmosis to score zero.
The expected answer is
(a) Definition of diffusion
The process by which molecules of different substances move randomly among one another.
OR
Intimate mixing of molecules/atoms/particles of different substance (as a result of kinetic
energy)
(b) Factors that affect the rate of diffusion
- density of substance
- mass of substance
- temperature