(a) Define diffusion (b) State two factors that affect the rate of diffusion
Question 1 Report
(a) Define diffusion
(b) State two factors that affect the rate of diffusion
Answer Details
(a) Diffusion: Diffusion is the net movement of molecules of a substance from a region of higher concentration to a region of lower concentration, as a result of the random motion of the molecules, until the molecules are evenly distributed.
(b) Two factors that affect the rate of diffusion:
- Temperature - a higher temperature gives the molecules greater average kinetic energy, so they move faster and diffuse more rapidly.
- Relative molecular mass (density) of the substance - lighter (less dense) molecules move faster and therefore diffuse more quickly than heavier ones.
(The concentration gradient and the medium of diffusion, gas versus liquid, are also acceptable factors.)
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