The tendency of molecules to move toward areas of lower concentration is called
a. suffusion
b. diffusion
c. suspension
d. effusion

The correct answer is B. The tendency of molecules to move toward areas of lower concentration is called diffusion. This happens when there is a concentration gradient. This is described by the Fick's laws of diffusion. Diffusion is the net movement of molecules from a higher concentration to lower concentration to achieve equilibrium.

The reaction will shift to the right