1. Changes in Matter
Section 3.3

2. Physical Change
a change in one or more of matter’s physical properties.
Examples: size, shape, or state of matter
the identity of the element or compound—does not change.
Examples: Melting, Boiling, Freezing, Slicing, Crushing, Glass Breaking

3. Physical Changes

4. Chemical Change
When matter changes chemically into an entirely different substance with different chemical properties.
change of one substance to another (makes something new)

5. Signs of Chemical Change
Color Change
Smoke/Odor
Heat
Light
Bubbles
Precipitate
any new physical properties that were not present before

6. Chemical Change

7. Chemical Changes

8. Physical & Chemical Changes of Matter

9. Reversing Chemical Changes
Because chemical changes produce new substances, they often cannot be undone.
Example: fried egg back to raw egg
Some can be reversed
Example: remove tarnish from pennies with vinegar

10. Conservation of Mass
Law of conservation of mass – matter cannot be created or destroyed.
Example: camp fire