Which of the Following Statements is Correct Regarding Diffusion

Question

Which of the following statements is correct regarding diffusion?
A) The higher the temperature, the slower the diffusion rate.
B) Temperature does not affect diffusion.
C) Molecular weight of a substance does not affect diffusion.
D) The greater the concentration gradient, the faster the rate.

Accepted Answer

The greater the concentration gradient, the faster the rate. Diffusion is the movement of particles from an area of high concentration to an area of low concentration, so the greater the difference in concentration between the two areas, the faster the diffusion rate. Temperature actually does affect diffusion, with higher temperatures increasing the rate of diffusion. Molecular weight does affect diffusion, with lighter molecules diffusing faster than heavier molecules. However, these statements are not reflected in the answer choices.