A substance that contains only one type of atom is a(n)

• compound
• element
• heterogeneous mixture
• homogeneous mixture

Which of these is a pure substance?

• bread
• table salt
• garden soil
• sea water

A mixture that appears to be evenly mixed throughout:

• an atom
• a compound
• a homogeneous mixture
• a heterogeneous mixture

A mixture that does NOT appear to be evenly mixed throughout is ______.

• an atom

• a compound

• a homogeneous mixture

• a heterogeneous mixture

Which of the following are pure substances?

• solutions
• compounds
• homogeneous mixtures
• colloids

Which of the following is NOT a pure substance?

• milk
• oxygen
• water
• carbon dioxide

Two classifications of a pure substance are

• homogeneous and heterogeneous
• atoms and elements
• elements and compounds
• solutions and colloids

Contains only one kind of atom.

• Element
• Compund
• Mixture

The air is a _________. 

• element 
• mixture 
• compound 
• energy 

Examples are milk and gasoline.

• elements
• mixtures
• compounds