The picture shows molecules on one side of a permeable membrane.

Question

Which indicates that diffusion is complete?

There will be more molecules on the right side than the left side of the membrane.
All the molecules will be on the right side of the membrane.
There will be more molecules on the left side than the right side of the membrane.
There will be an equal number of molecules on each side of the membrane.

Answer 1

Diffusion is considered complete when the concentration of molecules is equal on both sides of the permeable membrane. Therefore, the correct indication that diffusion is complete is:

There will be an equal number of molecules on each side of the membrane.