1. Physical
&
Chemical
Changes

2. Physical Changes
A Physical Change is when an object changes a physical property.
A change in size, shape, texture, or state (phase).
The object still is the same thing.

3. Examples of Physical Changes
Ripped Paper
Boiling Water
Cutting Hair
Broken Brick

4. Chemical Changes
A Chemical Change is a change in the chemical make-up of the object.
The object becomes a new object.
Something new is created.

5. Keys to Identifying a Chemical Change
Color change
Temperature change
Formation of a gas, bubbles, or odor.
Formation of a precipitate.

6. Examples of Chemical Changes
Fireworks exploding
An apple rotting
Baked cookies
Photosynthesis/Respiration
Digestion
Combustion (burning)

7. Is It a Physical or Chemical Change?
Burning House
Chemical
Melting Ice
Physical
Cutting Grass

8. Chemical Reaction -- A process in which some substances change into different substances.
Ex: Magnesium + Oxygen  Magnesium Oxide + =

9. Chemical Equations: Reactants Products Reactants – starting substance
On left of arrow
Products – ending substance… what is produced.
On right of arrow
Reactants Products