1. Physical Change:
Any change which alter a substance without changing its composition is know as a physical change.
Ex:
Cutting a sheet of paper.
Breaking a glass.
Cutting a copper wire.
Melting & boiling.

2. Chemical Change:
When one or more substances change into new substances showing different properties (a chemical reaction).
*Formation of a gas.
*Change in color.
Formation of a solid (precipitate).
Change in odor.

3. Physical Properties: Color State at 25oC (solid, liquid, or gas)
Melting point.
Boiling point.
Density.
Conductivity (heat & electricity).

4. Chemical properties:
Is the ability of a substance to combine with or change into one or more other substances.
Ex:
Form green powder when in contact with
moist air.
Form deep blue solution when in contact
with ammonia.
Release a gas when in contact with
hydrochloric acid.

5. Practice—Decide Whether Each of the Observations About Table Salt Is a Physical or Chemical Property
Salt is a white, granular solid.
Salt melts at 801 °C.
Salt is stable at room temperature, it does not decompose.
36 g of salt will dissolve in 100 g of water.
Salt solutions and molten salt conduct electricity.
When a clear, colorless solution of silver nitrate is added to a salt solution, a white solid forms.
When electricity is passed through molten salt, a gray metal forms at one terminal and a yellow-green gas at the other.
physical.
physical.
chemical.
physical.
physical.
chemical.
chemical.

6. Extensive Property Intensive Property
Depends on the amount
of matter in a sample.
Extensive
Property
Ex: mass & volume
(It can be changed).
Depends on the type
of matter in a sample.
Intensive
Property
Ex: Color, melting point.
boiling point, density.
(It can not be changed).