Lesson 4: What are Chemical Changes in Matter

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Presentation transcript:

Lesson 4: What are Chemical Changes in Matter By: Mr. Leslie’s Class

The CHANGE A chemical change is a change in matter that produces new kinds of matter with different properties. Energy is always involved in a chemical change The explosion of fireworks is an example of chemical change.

Chemical Change Molecules break apart and form new combinations with other atoms and molecules. What you start with is not what you end up with. Would you eat this???

Old Matter becomes New Matter Product Reactant

Common Chemical Changes Every time you ride in a car you depend on chemical changes. The Car battery Car engine burns gasoline The exhaust includes the products of burning gasoline

Clues to seeing the CHANGE Terminals - electrical If you see: Bubbles change in color change in state Temperature Odor Light Electricity Sound Motion Thermal Energy is the most common form of energy involved in chemical changes.

How does this happen? How does a chemical change occur? Atoms in molecules are held together by forces of attraction called chemical bonds. Old bonds are broke and new ones are formed.

Compare Physical and Chemical Changes Physical Changes Chemical Changes