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Properties & Changes of Matter

Properties & Changes of Matter. What is a property of matter?. Characteristic of that type of matter Can be physical or chemical property. Cannot be observed with senses- must be tested or reacted with something. Can be observed using your senses. Physical Properties.

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Properties & Changes of Matter

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  1. Properties & Changes of Matter

  2. What is a property of matter? • Characteristic of that type of matter • Can be physical or chemical property Cannot be observed with senses- must be tested or reacted with something Can be observed using your senses

  3. Physical Properties • Examples: mass, color, shape, smell, volume, density, melting point, boiling point, and hardness.

  4. Chemical Properties • Examples: ability to burn, ability to decompose (food), ability to rust, how it reacts with other substances

  5. Changing Matter • Matter can be changed two ways: • Physically • Chemically

  6. Physical Changes • Do NOT CHANGE THE IDENTITY OF MATTER on a chemical level • Nothing new or different is formed • Could be a change in: • state • shape • color • size Volume, Density, Mass

  7. Examples of Physical Changes • Boiling • Freezing • Evaporation • Dissolving • Breaking • Cutting • Painting • Making a mixture • 2 or more substances physically mixedtogether. Can be separatedphysically

  8. Chemical Changes • A chemical reaction MUST take place! • Matter changes at the atomiclevel (atoms separate and recombine in different ways!). • NEW SUBSTANCES are created!!!

  9. Chemical Changes • Rusting • Burning • Molding • Cooking • Mixing acids & bases • Food being metabolized in body (*where??) • Baking • Explosion of fireworks

  10. Law of Conservation of Mass • Atoms are just rearranged, NOT created or destroyed Mass is conserved  total amount of atoms cannot change • Nothing is ever createdor destroyed!

  11. Practice Problem • Susie adds 10g of sodium to 15g of chlorine. How much NaCl should be present after the reaction, according to the Law of Conservation of Mass?

  12. REMEMBER! • Compounds- made of up DIFFERENT types of atoms only. (ex: H2O, CO2 but not H2!)

  13. Law of Conservation of Mass…?!!?!

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