Question

how do particles behave during diffusion? particles must move with the help of transport molecules. particles are not spread out perfectly all the time because they are moving randomly. particles always spread out perfectly when given time and space. particles always move against the concentration gradient.

Explanation:

• Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration.
• Particles move randomly during diffusion. Due to this random motion, they do not spread out perfectly all the time.
• Transport molecules are involved in facilitated diffusion (a type of passive transport but a more specific process than simple diffusion).
• Particles move down the concentration gradient (from high to low) in simple diffusion, not against it.
• Saying particles "always spread out perfectly" is incorrect because of their random motion.

Answer:

Particles are not spread out perfectly all the time because they are moving randomly.