Physical Chemical Changes Page 1 Physical Changes A

Physical & Chemical Changes Page 1

Physical Changes • A Physical Change is when an object changes a physical property. – A change in size, shape, texture, or state (phase). – The object still is the same thing. Page 2

Examples of Physical Changes • Ripped Paper • Boiling Water • Cutting Hair • Broken Brick Page 3

Chemical Changes • A Chemical Change is a change in the chemical make-up of the object. – The object becomes a new object. – Something new is created. Page 4

Keys to Identifying a Chemical Change 1. 2. 3. 4. 5. Color change Temperature change Heat, Light or Sound is given off. Formation of a gas, bubbles, or odor. Formation of a precipitate. Page 5

Examples of Chemical Changes • • • Fireworks exploding An apple rotting Baked cookies Photosynthesis/Respiration Digestion Combustion (burning) Page 6

Is It a Physical or Chemical Change? 1. Burning House 1. Chemical 2. Melting Ice 1. Physical 3. Cutting Grass 1. Physical Page 7

• Chemical Reaction -- A process in which some substances change into different substances. • Ex: Magnesium + Oxygen Magnesium Oxide + = Page 8

Chemical Equations: • Reactants – starting substance • On left of arrow • Products – ending substance… what is produced. • On right of arrow Reactants Products Page 9