Osmosis and Diffusion Concepts

The video tutorial explains the differences between osmosis and diffusion, focusing on how molecules move across membranes. Osmosis involves solvent molecules moving from low to high concentration through a semipermeable membrane, aiming to equalize concentrations. Diffusion, on the other hand, involves solute molecules moving to equalize concentration without a membrane. The concept of osmotic pressure is introduced, which is the pressure needed to stop solvent flow. Dialysis is briefly discussed as the movement of solute molecules from high to low concentration, commonly seen in kidney dialysis.

What is the primary difference between osmosis and diffusion?

• Diffusion requires a semipermeable membrane, while osmosis does not.

• Osmosis and diffusion are the same processes.

• Osmosis requires a semipermeable membrane, while diffusion does not.

• Osmosis involves solute molecules, while diffusion involves solvent molecules.

In osmosis, solvent molecules move from:

• Low to high concentration.

• Low to low concentration.

• High to low concentration.

• High to high concentration.

What role does a semipermeable membrane play in osmosis?

• It allows only solute molecules to pass through.

• It allows only solvent molecules to pass through.

• It blocks all molecules from passing through.

• It allows all molecules to pass through.

During diffusion, solute molecules move to:

• Create a concentration gradient.

• Equalize concentration throughout the solution.

• Increase concentration in one area.

• Decrease concentration in one area.

Which example best illustrates diffusion?

• Water moving through a semipermeable membrane.

• Food coloring spreading evenly in water.

• Oil separating from water.

• Salt dissolving in water.

What is osmotic pressure?

• The pressure needed to start the flow of solvent molecules.

• The pressure needed to decrease solute concentration.

• The pressure needed to increase solute concentration.

• The pressure needed to stop the flow of solvent molecules.

How does osmotic pressure affect osmosis?

• It has no effect on the flow of solvent molecules.

• It reverses the flow of solvent molecules.

• It stops the flow of solvent molecules.

• It accelerates the flow of solvent molecules.

What is the primary function of dialysis in medical applications?

• To decrease blood sugar levels.

• To increase oxygen levels in the blood.

• To increase blood pressure.

• To clean the bloodstream.

In dialysis, solute molecules move from:

• Low to low concentration.

• High to low concentration.

• Low to high concentration.

• High to high concentration.

Which process is most similar to osmosis?

• Diffusion

• Filtration

• Evaporation

• Dialysis