The document provides instructions to set up Cornell notes on specific pages of a textbook. It then summarizes key concepts about elements, compounds, and mixtures from a middle school science website. Specifically, it defines pure substances as materials made of only one type of atom that cannot be broken down further. Compounds are defined as pure substances made of two or more elements bound chemically. Physical and chemical changes are also briefly discussed. Animated images are included from additional websites to illustrate atomic structure and behavior.

1. Set up Cornell Notes on pages 73, 75,Set up Cornell Notes on pages 73, 75,
77 & 7977 & 79 Summary section (about 1/3 of the page) on
page 79)
Elements, Compounds
& Mixtures
www.middleschoolscience.com 2008

2. •Anything that has a mass and a volume
•Matter can be either a pure
substance or a mixture of more than
one pure substance.

3. • A pure substance is
one in which all of
the particles are the
same.
• Examples: zinc, iron,
salt, sugar, pure
water
Pure SubstancesPure Substances

4. •Changing from one state to another is a
Physical Change.
•If a new substance is formed it is a
Chemical Change.
Images are from http://www.chem4kids.com

5. Close up view of atoms and their behavior
Animated images are from http://www.chem.purdue.edu/gchelp/
Physical Property

6. • The building blocks of Matter
• Consists of Protons (+),
Electrons (-), and Neutrons (N).
• Consists of only one kind of atom,
• Cannot be broken down into a simpler type of
matter by either physical or chemical means
• Can exist as either atoms or molecules.
Images are from http://www.chem4kids.com
Pure SubstancesPure Substances

7. Animated images and notes from http://www.chem.purdue.edu/gchelp/atoms/elements.html
• Atoms of two or more different elements
bound together.
• Can be separated into elements
chemically, but not physically.
In the animation above, water (H20) is a compound made of
Hydrogen and Oxygen.
Pure SubstancesPure Substances

8. • The symbols make up the formula. A
formula is just chemical shorthand for the
compound.
• The subscript lets us know how many
atoms are present.
• The coefficient lets us know how many
molecules are present.
• Example—2 H2O
coefficient subscript