Areas of low concentration to areas of high concentration

Areas of high concentration to areas of low concentration

Cold to hot environments

Gaseous to liquid environments

Sugar settling at the bottom of a water glass

A cell with lots of water in it absorbing even more water

A bottle of soda in which bubbles of carbon dioxide are evenly distributed

Warm air moving from a radiator to fill up a room

A group of molecules that have stopped moving completely

A room whose temperature is consistent throughout

Carbon dioxide bubbles escaping from a soda bottle when it's opened

A tree's roots absorbing nutrients from the soil

When equilibrium is reached

Never

When the temperature is below 0 degrees Celsius

When the substance they are part of becomes a solid

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

Solids, liquids, gases

Liquids, gases, solids

Gases, liquids, solids

Gases, solids, liquids

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

It's the basic power source for most types of cells

It allows substances to move across cell membranes

It prevents toxins from entering our bodies

Without diffusion, cell division could not take place

They sink to the bottom of the cup

They spread out

They clump together

They freeze

An area with a SMALL number of particles

An area with a LARGE number of particles

An area with an UNEVEN number of particles

An area with no particles

High, Low

Low, High

Low, Low

High, High

Spread out

Tightly packed together

Uncrowded

Spacious

Speeds it up

Slows it down

Nothing

Stops it all together

Nitrogen and Oxygen

Oxygen and Carbon Dioxide

Nitrogen and Carbon Dioxide

Argon and Nitrogen