Key Concepts:

• Anything with mass that takes up space is matter. Examples would be: this computer, the air around you, and you!
• Scientists classify matter into two groups: mixtures and pure substances.

Pure Substances

• Have a constant composition—uniform throughout
• Cannot be broken down into simpler substances by physical means
• Are either elements (composed of one type of atom) or compounds (two or more types of atoms that are chemically bonded)

Mixtures

• Can be separated by physical means (filtration, magnetism, boiling, by hand)
• Are homogeneous if uniform throughout
• Are heterogeneous if not uniform throughout

Check out this video describing how your breakfast foods are either heterogeneous or homogeneous mixtures. 

Click on the site below to read about elements, compounds and mixtures. Pay attention to the animation.
Elements, Compounds & Mixtures

Click on this website to virtually separate some mixtures.  Be sure to read the directions at the top of the screen. Answer the questions below when you finish. 
Mixtures

Click the radio button for the answer you think is correct. You will receive feedback to the right of each question.