Particle Model Quick Check

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Question
At what point, if any, does the process of diffusion stop? (1 point)
Responses

Diffusion does not stop happening because there is always an area of lower concentration.
Diffusion does not stop happening because there is always an area of lower concentration.

Diffusion does not stop happening because particles are always moving.
Diffusion does not stop happening because particles are always moving.

Diffusion stops when particles are at an equal concentration in the area they occupy.
Diffusion stops when particles are at an equal concentration in the area they occupy.

Diffusion stops when all particles have moved from one area to another.
Diffusion stops when all particles have moved from one area to another.
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Answer 1

Diffusion stops when particles are at an equal concentration in the area they occupy.

This is because, at equilibrium, there is no net movement of particles from one area to another, as their concentrations are equal. While particles continue to move, diffusion as a net process ceases when concentrations are equal.