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