03 Particle Model 2

What causes diffusion?

• The constant, random motion of molecules

• Magnetic attraction between atoms

• The nuclear forces that hold atoms together

• The tendency of atoms to form chemical bonds with one another

From fastest to slowest rate of diffusion, which of the following is in the correct sequence?

• Solids, liquids, gases

• Liquids, gases, solids

• Gases, liquids, solids

• Gases, solids, liquids

Which of the following will diffuse the fastest?

• A tablespoon of sugar in a glass of water

• Heat through a solid piece of steel

• A pinch of salt in a glass of water

• The smell of bacon cooking throughout a room

What happens to the coffee particles when coffee is added to hot water?

• They sink to the bottom of the cup

• They spread out

• They clump together

• They freeze

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

• High, Low

• Low, High

• Low, Low

• High, High

An increase in temperature does what to diffusion?

• Speeds it up

• Slows it down

• Nothing

• Stops it all together

Diffusion occurs only in solids

• True

• False

What happens to particles when they are heated?

• They speed up and spread out
• They slow down and compress
• They stop moving
• They move closer together and speed up

How do the particles move in diffusion?

• From a region of low concentration to a region of high concentration

• From a region of high concentration to a region of low concentration

• From a region of low concentration to a region of low concentration

• From a region of high concentration to a region of high concentration

Which diagram best shows the end result of diffusion?

• F

• G

• H

• J