Physical and Chemical Changes:
o Everything that has a mass and a volume is called matter.
o Regardless of state, matter will always undergo physical and chemical changes.
 These can be microscopic or macroscopic.
o A physical change occurs when the substance changes state, but does not change its
chemical composition.
o Examples of Physical Changes:
 Water Freezing to Ice
 Cutting a Piece of Wood
 Breaking Glass
o Characteristics of Physical Changes:
 Melting Point
 Vapor Pressure
 States of Matter
 Electrical Conductivity
 Adsorption of a Surface
 Boiling Point
 Color
 Density
 Solubility
 Hardness
o A chemical change occurs when a substance changes into something new.
o This often occurs due to heating or a chemical reaction.
o Evidence of a Chemical Change:
 Formation of a Gas

Color Change

Formation of a Precipitate

o A precipitate is a solid that forms and separates from a liquid
mixture.
Temperature Change