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Physical and Chemical
Changes
All matter has properties...
What is a property?
A property is a trait that tells you something about an object.
What would the properties of clay be?
What would the properties of gold be?
Physical Changes
A physical change happens when matter changes size, shape, or form.
Physical changes can be reversed.
The matter is still the same substance, it just looks or feels different.
Examples:
• breaking glass
• crushing a can
• breaking a pencil
• erosion/weathering
• changing state (melting, freezing, evaporating, condensing)
Chemical Changes
A change in which matter becomes something completely different.
Chemical changes CANNOT be reversed.
Chemical changes often create heat.
Cooking pancakes
frying an egg
a car rusting
leaves changing color
fireworks exploding
burning wood