March 30, 2017
What is a Physical Change?
Physical Change: When matter changes in size, shape, or state without
changing its identity.
March 30, 2017
Examples of a Physical Change?
A Physical Change has occurred when a
substance/object has:
-Melted
-Frozen
-Condensed
-Evaporated
-Crushed
-Cut
_When Salt or Sugar are dissolved in water
*Physical Changes can usually be reversed.
March 30, 2017
What is a Chemical Change?
Chemical Change: A change that results in the formation of a new
substance.
Everyday Examples of a Chemical Change:
- Rust
- Tarnish
- Baking a cake
- Engines (Cars and Rockets)
How Do You Know A Chemical Change Has Occured?
A Chemical Change has occurred when you see one of these signs:
- Color Change
- Formation of a gas
- Formation of Light or Heat