Pure Substances and Mixtures

An _______________ is made up of one or more of the same kind of atom chemically combined.

• atom

• element

• molecule

• compound

A ______________ is made up of different kinds of atoms chemically combined.

• element

• compound

• mixture

• molecule

True or False: elements AND compounds are pure substances.

• True

• False

A ______________ mixture is one that does not have a uniform composition.

• heterogeneous

• homogenous

• pure substance

A _________________ mixture is one where the substances are evenly spread throughout.

• heterogeneous

• homogeneous

• pure substance

Fruit Loops, pizza, and Skittles are examples of ____________________ mixtures.

• heterogeneous

• homogeneous

• pure

Which of these is an element?

• Salt (NaCl)

• Water (H20)

• Oxygen (O)

• Carbon Dioxide (CO2)

Air is:

• An element

• A compound

• A mixture

• None of these

What is the smallest unit of matter?

• atom
• element
• molecule
• compound

A pure substance that cannot be broken down into other substances by chemical or physical means. 

• compound          
• atom
• mixture 
• element