Download Physical and Chemical Changes

Physical and Chemical
Changes
Physical Changes
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Alters the characteristics of a substance
without producing a new substance
Includes:
Change in state
 Creation or separation of mixture
 Physical deformation
 Physical relocation
 Change in malleability
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Examples of physical change
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Cutting a piece of paper into smaller
pieces
Ice cube melting
Mixing sugar and water
Chemical Changes
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Produces a new substance with distinct
characteristics and properties
Caused by chemical reactions, energy
being absorbed or released
Indications:
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appearance, texture, colour, odour, density
Helpful Hints for Identifying
Chemical Changes
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Precipitate forms (lumps in milk)
Colour change (apple turning brown)
Gas forms (dissolving alka seltzer)
Creates energy in form of heat (burning)
Odour
Examples of chemical change
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Burning a piece of paper
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Bleaching your hair
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Gained new properties, chemical change
called combustion
Bleach reacts with melanin in hair removing
colour
Baking a cake
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Absorbed energy
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Both physical and chemical changes can
be reversible and irreversible
Chemical change:
Burning a piece of paper
 Carbonation in a drink
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Physical change:
Ice cube melting
 Crushing a rock
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Apply your knowledge
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Melting candle wax
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Rust on your car
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Chemical
Burning a log
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Physical
Chemical
Boiling water
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Physical