The video explains diffusion and osmosis, focusing on the movement of molecules from high to low concentration. Diffusion is described as a passive process 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. The video aims to clarify these concepts in under five minutes.

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

• They are pushed by external forces.

• They possess energy and move randomly.

• They are attracted to low concentration areas.

• They are heavier in high concentration areas.

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

• Concentration gradient

• Color of the molecules

• Temperature

• Molecular weight

How does temperature affect the rate of diffusion?

• Temperature has no effect on diffusion.

• Lower temperature speeds up diffusion.

• Higher temperature speeds up diffusion.

• Higher temperature slows down diffusion.

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NGSS.MS-PS1-4

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What happens to the rate of diffusion when the molecular weight of the molecules is high?

• Diffusion stops completely.

• Diffusion occurs faster.

• Diffusion occurs slower.

• Diffusion rate remains the same.

What is the main difference between diffusion and osmosis?

• Osmosis involves movement through a partially permeable membrane.

• Diffusion requires energy while osmosis does not.

• Diffusion occurs only in gases.

• Osmosis occurs only in liquids.

Which molecules are typically unable to pass through a partially permeable membrane in osmosis?

• Oxygen molecules

• Carbon dioxide molecules

• Glucose molecules

• Water molecules

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How does the concentration gradient affect osmosis?

• A higher concentration gradient speeds up osmosis.

• A lower concentration gradient speeds up osmosis.

• It has no effect on osmosis.

• A higher concentration gradient slows down osmosis.

What is the effect of diffusion distance on the rate of osmosis?

• Longer distance speeds up osmosis.

• Shorter distance slows down osmosis.

• Longer distance slows down osmosis.

• Distance has no effect on osmosis.

Why is diffusion considered a passive process?

• It does not require energy input.

• It only occurs in living organisms.

• It requires energy input.

• It only occurs in non-living systems.

What makes it energetically favorable for molecules to spread out in diffusion?

• They are attracted to each other.

• They are more stable when spread out.

• They are heavier when spread out.

• They are pushed by external forces.