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 Changes Cutting Bending Tearing Breaking Melting Dissolving Magnetizing Boiling Warming Cooling Freezing Evaporating Separating

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