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