Only one atom

Only gold atoms

Only two different atoms

A mixture of atoms

Water (H₂O)

Hydrogen (H₂)

Salt 🧂 (NaCl)

Iron (Fe)

Carbon dioxide (CO₂)

An element

A mixture

A compound

In a mixture, all the chemicals have reacted together and bonded

In a compound the elements have reacted together and bonded

To make a mixture, the chemicals must be combined in the same amounts every time

In a compound, the atoms are always combined in a specific ratio

Salt water

Water and sand

Sand and salt

Iron and sand

Salt and water

Tap water

Air

Milk

Copper

Oxygen

Coffee grinds and coffee

Salt and water

Sand and salt

Sand and water

Oil and water

To get clean water from dirty water

To separate a soluble solid (like salt or minerals) from water

To separate hydrogen from water

To separate an insoluble solid (like sand) from water