Download Physical and Chemical Changes

Physical Change
 Physical change is a change that occurs
that does not change the identity of the
substance
 A change in which matter looks different
but is still the same matter .
 A change that affects the size, shape or
color of a substance but does not affect its
composition
EXAMPLES OF PHYSICAL CHANGES
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Cutting paper
Mashing potatoes
Painting a wall
Breaking glass
Melting marshmallows
Molding clay
Water freezing
Water boiling
Thawing meat
 A physical change alters the form of a
substance, but does not change it to another
substance.
Making Orange Juice
Chemical change is a change that occurs
causing the identity of the substance to change.
Examples include:
>Burning wood
>Digesting food
>Potassium reacting with water
A chemical change can also be called a
chemical reaction.
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Examples of Chemical Changes
Wood burning to ash and smoke (a new
substance is formed)
Iron rusting
Marshmallows burning
Apple rotting
Toasting bread
.
Example:
Baking a Cake
Indicators of a
Chemical Change
Indicators of a chemical change can include:
Light is produced
Heat is either absorbed or produced
Gas is produced
There is a change in color
Formation of a precipitate
Differences between physical and chemical
changes
 With a physical change, the item can be
change back to its original form
 With a chemical change, the item cannot be
changed back to its original form
IS IT A CHEMICAL OR A PHYSICAL CHANGE
Type of Change
Physical
Chemical
Melting ice
Burning wood
Souring milk
Wadding up paper
Rusting metal
Corn Starch and
Water
Corn Plastic
Adapted from: www.dpi.state.nc.us/docs/curriculum/science/units/.../8unit2pt2.ppt
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