Chemical and Physical Changes

Mrs. Lowe April 2011

Chemical changes

• Chemical change is a change that forms a new type of matter

• Chemical property is a feature of matter that can cause a chemical change

Examples of a different type of matter forming during a chemical change

Burning logs ashes

New tricycle Rusted tricycle

Changes in type of matter

Apple Rotting Apple

Shiny silver Tarnished silver

Some clues or evidence of Chemical Changes

• Changing color (food rots, metal rusts or tarnishes)

• Having an unusual smell • Changing texture • Becoming more or less acidic• Getting hot or cold without being heated or

cooled • Bubbles forming because a gas is giving off

Note

• During a physical change • bubbles form when water boils, but it is not a chemical

change • Modeling clay changes color if you mix two colors

together

Physical Change

Physical change is a feature of matter that you can recognize with your senses.

Physical change is a change in matter in which they type of matter stays the same

Texture the feel of a surface.

Some Physical Properties

shape temperature color smell hardness mass weight

length state of matter volume texture

Some Physical ChangesCuttingBendingTearing

BreakingMelting

DissolvingMagnetizing

BoilingWarmingCoolingFreezing

EvaporatingSeparating

Physical or Chemical Change

Mixing salt and water

Physical Change

Physical or Chemical

Boiling water

Physical Change

Chemical or Physical Change

Cooking an egg

Chemical Change

Chemical or Physical Change

Chewing a cracker

Chemical Change

Chemical or Physical Change

Mixing chocolate powder into milk

Physical or Chemical Change

Physical change