1. Changes in Matter

2. Physical Change
Alters only the form or state of a substance (freezing, breaking, melting). No new substance is created.
The chemical composition remains the same.
It is usually reversible. The substance can usually return to the way it was before.

3. Types of Physical Change
Types of Physical Change Examples:
Change of State
Dissolving
Change of Form
Ice Melting
Mixing sugar in tea
Chopping Wood

4. Changes in State

5. Changes of state
Heat added or lost
Two everyday examples (think of them as a class!)
Freezing
Lost
Condensation
Vapourization
Added
Melting
Sublimation (gas to solid)
Sublimation (solid to gas)

6. Chemical Change Reactants → Products
Changes a substance into a new substance that has different physical & chemical properties & a new chemical formula.
Chemical changes are not usually reversible. The substance cannot be changed into what it was before.
Chemical changes are the result of chemical reactions.
Reactants → Products

7. Examples of a Chemical Change
Cooking an egg
A car rusting
Burning wood
Digesting food to produce energy

8. Signs that a chemical change has happened
A permanent change in colour.
Bubbles of gas are produced.
Two solutions mix to form a solid called a precipitate.
Energy in the form of heat or light is released or absorbed.
Electricity is produced.
The change is not easily reversed. **

9. Videos Characteristics of a Physical Change Video:
Chemical Change and Baking Video:

10. To Do / Homework 1. Physical vs. Chemical Changes Worksheets
2. Textbook:
Read pages , 169
Questions: pg. 169 #3-5
3. Finish Density Column Assignment (due tomorrow!)
4. Review for Quiz – Physical and Chemical properties (including density) on Thursday!