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Chemical Changes!!! What is a Physical Property? • A property that can be observed or measured without changing the chemical makeup of the substance What is a Chemical Property? • Properties that can be observed or measured BUT the chemical makeup of the substance is changed, usually into a totally new substance - They CANNOT be determined just by viewing or touching the substance - The chemical makeup of the substance must be changed which often leads to new substances being formed Chemical Changes Changes in matter that produce new substances with properties that are different from the original substances How do we know when chemical changes have occurred? 4 indicators that tell us when: 1. Gas or bubbles are produced 2. Temperature changes 3. Color changes * Be careful with temperature and color changes because they do not always indicate a chemical change!!! 4. Precipitate is produced What is a Precipitate? • It is the solid that is formed during a chemical reaction Oxidize • A chemical reaction with Oxygen • Sometimes referred to as Oxidation or Rust Tarnish • The dullness or discoloration that is caused by oxidation Key Words To Look For: _______Physical________ • Tearing/Ripping • Melting/Freezing • Boiling/Evaporating • Breaking/Combining • Mixing/Slicing _______Chemical_______ • Oxidize/Rusting • Burning/Cooking • Tarnish/Rotting • Digest/Break Down • Creating/New