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What does the 'rate of diffusion' describe?

• How much substance is present.

• How quickly particles spread out.

• The total distance particles travel.

• The type of membrane involved.

Which of the following is NOT a factor that affects the rate of diffusion?

• Concentration gradient

• Temperature

• Surface area of the membrane

• Color of the substance

What is defined as the difference in the concentration of a substance across a membrane?

• Osmotic pressure

• Active transport

• Concentration gradient

• Membrane permeability

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How does an increase in the concentration gradient affect the rate of diffusion?

• It decreases the rate of diffusion.

• It has no effect on the rate of diffusion.

• It increases the rate of diffusion.

• It only affects diffusion in liquids, not gases.