AP BIOLOGY

Detailed explanation-1: -Diffusion stops when the concentration is evenly spread out-true or false? 100% definitely true.

Detailed explanation-2: -A principle of diffusion is that the molecules move around and will spread evenly throughout the medium if they can.

Detailed explanation-3: -Diffusion stops when the concentration of the substance is equal in both areas. This does not mean that the molecules of substance are not moving any more, just that there is no overall movement in one direction.

Detailed explanation-4: -Diffusion takes place as long as there is a difference between the concentrations of a substance across a barrier. However, diffusion stops, when the concentrations of the substance on either side of the barrier become equal. The permeability of a membrane affects the rate of diffusion.

Detailed explanation-5: -Because diffusion depends upon random particle movements, substances diffuse across membranes without requiring the cell to use energy. Even when equilibrium is reached, particles of a solution will continue to move across the membrane in both directions.