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