Molecular Movement and Diffusion Concepts

The video explains diffusion as the movement of molecules from high to low concentration due to Brownian motion. It discusses the energetic benefits of molecules spreading out and identifies four factors affecting diffusion: concentration gradient, temperature, molecular weight, and pressure. Higher concentration gradients and temperatures increase diffusion rates, while higher molecular weights slow it down. Reducing container size speeds up diffusion by decreasing the distance molecules need to travel.

What is the primary concept of diffusion?

• Molecules staying in one place

• Molecules moving in a fixed pattern

• Movement of molecules from high to low concentration

• Movement of molecules from low to high concentration

What causes molecules to move randomly in diffusion?

• Brownian motion

• Gravitational pull

• Magnetic fields

• Electrical currents

Why is it energetically beneficial for molecules to spread out?

• It increases energy

• It decreases energy

• It stabilizes the system

• It destabilizes the system

What is the result of molecules bouncing off each other in diffusion?

• They stay in one place

• They form clusters

• They spread out evenly

• They move to the container walls

How does a higher concentration gradient affect diffusion?

• It reverses the direction of diffusion

• It has no effect on diffusion

• It speeds up diffusion

• It slows down diffusion

What happens to molecules when the temperature increases?

• They stop moving

• They move slower

• They move faster

• They change direction

Which type of molecules diffuse faster?

• Molecules with equal weight

• Molecules with no weight

• Lighter molecules

• Heavier molecules

What is the effect of decreasing the size of the container on diffusion?

• Diffusion occurs faster

• Diffusion occurs slower

• Diffusion stops

• Diffusion reverses

What is the role of molecular weight in diffusion?

• Heavier molecules diffuse faster

• Molecular weight has no effect

• Lighter molecules diffuse slower

• Heavier molecules diffuse slower

How does pressure affect diffusion?

• Decreased pressure speeds diffusion

• Decreased container size speeds diffusion

• Increased container size speeds diffusion

• Increased pressure slows diffusion