Physical and Chemical Changes
Grade 9 Science
Definition
A physical change does not affect the nature or the characteristic properties of the matter being altered.
Types of Physical Changes
Phase change: Liquid to solid
FREEZING
Releasesenergy
Phase change: Solid to liquid
MELTING (FUSION)
Absorbsenergy
Phase change: Liquid to gas
EVAPORATION
Absorbsenergy
Phase change: Gas to liquid
CONDENSATION
Releasesenergy
Phase change: Solid to gas
SUBLIMATION
Absorbsenergy
Phase change: Gas to solid
DEPOSITION
Releasesenergy
Creating a solution by dissolving a solute in a solvent
DISSOLUTION
OR
Tearing
Breaking
Breaking
Bending
Stretching
Heating
Chiseling
Piercing
Crushing
Change in Shape
DEFORMATION
Absorbsenergy
NOTESWorkbook p. 27
Homework:Workbook p. 28
Definition
A chemical change changes the nature and the characteristic properties of matter.
Chemical Equations
Chemical Equations
Chemical Equations
Law of conservation of mass
5 Signs of a Chemical Change
5 Signs of a chemical change
Release of a gas
5 Signs of a chemical change
Colour change
5 Signs of a chemical change
Generation of light and/or
heat
5 Signs of a chemical change
Formation of a precipitate
Types of Chemical Change
SynthesisA + B AB
Synthesis is the formation of a complex molecule from atoms or simpler molecules.
Example: Photosynthesis6CO2 + 6H2O + energy C6H12O6 + 6O2
OR
DecompositionAB A + B
Decomposition is the transformation of a complex molecule into simpler molecules or into
atoms.
Example: RespirationC6H12O6 + 6O2 6CO2 + 6H2O + energy
OR
OxidationReleasesenergy
Oxidation involving a great deal of energy = COMBUSTION
Releasesenergy
Precipitation
• Two solutions combine to form a solid that is not soluble.
VideoOR
NOTESWorkbook p. 29-30
Homework:Workbook p. 31-33