Question

4. Which of the following factors increase the rate of diffusion of a substance? (Check all that apply.)!
a. decreased temperature
b. decreased viscosity of the solvent
c. increased molecular weight of the substance
d. increased permeability of the membrane

Answer 1

Factors that will increase the rate of diffusion are:

b. decreased viscosity of the solvent

d. increased permeability of the membrane

• The greater the difference in concentration, the quicker the rate of diffusion. The greater the surface area, the faster the rate of diffusion.
• The rate of diffusion or of effusion of a gas is inversely proportional to the square root of its molecular weight.
• If the medium is less dense or less viscous, then the particles will be able to move more quickly and will diffuse faster.

• Higher temperatures increase the energy and therefore the movement of the molecules, increasing the rate of diffusion.

Thus, the correct options are b and d.

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