Properties & Changes of Matter

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

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

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

Changing Matter Matter can be changed two ways: Physically Chemically

Physical Changes Nothing new or different is formed Do NOT CHANGE THE IDENTITY OF MATTER on a chemical level Nothing new or different is formed Could be a change in: Change in state Shape Color Size Volume Density Mass

Examples of Physical Changes Boiling Freezing Evaporation Dissolving Breaking Cutting Painting Making a mixture 2 or more substances physically mixed together Can be separated physically

Chemical Changes **A chemical reaction MUST take place! Matter changes at the atomic level (atoms separate and recombine in different ways!) and NEW SUBSTANCES are created!!!

(New Substances!! A chemical change took place!) Chemical Changes Molecules are bonding and “unbonding” Atoms are re-arranged into different combinations For example: CaCO3 + heat  CaO + CO2 (New Substances!! A chemical change took place!) **Did you lose any atoms?

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

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