Physical Property Can be observed with the senses or measured without changing the substance Examples: Melting point Boiling point Color/shape Density Mass

Physical Change A change that does not involve altering the identity of the substance Examples: Freezing Melting Boiling Cutting Grinding

Chemical Property Relates to a substance’s ability to undergo a change into a different substance Examples: Ability to rust Flammable Ability to react with an acid Decomposes in light

Chemical Change A change where one or more substances is converted into different substances (a chemical reaction) Examples: Rotting Burning Fermenting Cooking

So how do I recognize a chemical change??

So how do I recognize a chemical change?? Bubbling – production of a gas Heat Light Precipitate – a solid formed during a reaction Unexpected color change

Chemical change = chemical reaction and is written as Reactants  Products This is what you make This is what you start with