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