Molecular Movement Insights: Diffusion and Osmosis Explained

The video explains diffusion and osmosis, focusing on how molecules move from high to low concentration. Diffusion is driven by Brownian motion and is influenced by concentration gradient, temperature, molecular weight, and pressure. Osmosis is similar but involves movement across a partially permeable membrane. Factors affecting osmosis include temperature, concentration gradient, and diffusion distance. Both processes are passive and energetically favorable.

What is the primary reason molecules move from a region of high concentration to low concentration in diffusion?

• They are attracted to each other.

• They are pushed by external forces.

• They are heavier in high concentration areas.

• They possess energy and move randomly.

Which factor increases the rate of diffusion when the concentration difference is larger?

• Temperature

• Pressure

• Concentration gradient

• Molecular weight

How does temperature affect the rate of diffusion?

• Higher temperature slows down diffusion.

• Temperature has no effect on diffusion.

• Higher temperature speeds up diffusion.

• Lower temperature speeds up diffusion.

What happens to diffusion when molecular weight is high?

• Diffusion stops completely.

• Diffusion is unaffected.

• Diffusion occurs slower.

• Diffusion occurs faster.

In the context of diffusion, what effect does reducing the size of the container have?

• It stops diffusion.

• It slows down diffusion.

• It speeds up diffusion.

• It has no effect on diffusion.

What is the main difference between diffusion and osmosis?

• Osmosis requires energy.

• Diffusion occurs only in liquids.

• Osmosis involves a partially permeable membrane.

• Diffusion involves a permeable membrane.

Which molecules are typically able to pass through the membrane in osmosis?

• Glucose molecules

• Salt molecules

• Water molecules

• Protein molecules

Why is diffusion considered a passive process?

• It requires energy input.

• It occurs only in non-living systems.

• It occurs only in living organisms.

• It does not require energy input.

Which factor does NOT affect osmosis?

• Temperature

• Molecular weight

• Concentration gradient

• Diffusion distance

What happens to osmosis when the diffusion distance is very short?

• Osmosis stops completely.

• Osmosis is unaffected.

• Osmosis occurs faster.

• Osmosis occurs slower.