Particles on the move

Diffusion is the movement of molecules from an area of _____ concentration to an ______ concentration

• High, low

• Low, high

• Low, low

• High, high

The picture below is an example of _________________.

• osmosis

• isotonic

• diffusion

• active transport

The movement of particles is __________, resulting in the particles being spread throughout the container

• Structured

• In a straight line

• In curved, way motions

• Random

diffusion occurs only in gases

• true

• false

When does diffusion stop?

• When all the particles leave the system

• When the particles are evenly spread out

• When there are no particles left

What does a 'region with high concentration' mean?

• SMALL number of particles

• LARGE number of particles

• no particles

What causes diffusion?

• The constant, random motion of molecules

• Magnetic attraction between atoms

• The nuclear forces that hold atoms together

Your lungs are constantly exchanging oxygen and carbon dioxide between your body cells and your blood cells by diffusion. As you exercise intensely, your body temperature increases slightly. How does this affect the process of diffusion?

• The rate of diffusion increases due to your slightly higher body temperature.

• The rate of diffusion decreases due to your slightly higher body temperature.

• The rate of diffusion is unaffected by changes in temperature.

Which diagram best shows the end result of diffusion?

• F

• G

• H

• J

Zara's mother opens a bottle of perfume. Zara is at the other side of the room. After a few minutes, Zara can smell the perfume.

Which of these explains why Zara smells the perfume?

• All the gas particles of the perfume move in one direction

• All the gas particles of the perfume move randomly.

• All the particles in the air move in one direction.