1. Think of your favorite food. 2. How would you describe your food? 3. What does it look like? Smell like? Think of descriptive words.

 There are two basic types of properties that we can associate with matter.  Physical Properties: Properties that do not change the chemical nature of matter  Chemical Properties: Properties that do change the chemical nature of matter

 Some ways to detect physical properties  Color  Shape  Size  Texture  Volume  Mass  Physical properties do not change the substance  Example – stretching a rubber band

 Is a change in any physical property of a substance, not in the substance itself.  Examples  Breaking a piece of clay in half  Changes size and shape only  Change in a substances state of matter  Example – water and ice – liquid to solid

 Characteristic of a Substance that describes how it can form a new substance  Examples  Wood burns and turns into ashes  iron rusts when left outdoors  Silver develops tarnish on the surface

 The change of one substance into another substance  Affects the substances involved in the change  During change combinations of atoms in the original substance is rearranged to make new substance

 Odor  Produce new smell – i.e. rotten egg – produces sulfur smell  Temperature  Increase or decrease – i.e. Logs burning on campfire  Color  Change in color – i.e. fruit changes color as it ripens  Bubbles  Formation of gas bubbles – i.e. antacid tablet in water  Solid  Forms a solid – two liquids combined called precipitate  i.e. – clams shells – seawater combining with creature

 Changes in Matter Changes in Matter

 Matter will change phases when heat is added or lost.  Melting: process where a solid becomes a liquid (heat is added)  Melting point – lowest temperature at which a substance begins to melt  Freezing: process which a liquid becomes a solid (heat is lost)  Freezing point – temperature that a liquid becomes a solid  Evaporation: process that a liquid becomes a gas (heat is added)  Occurs at the surface of the liquid

 Matter will change phases when heat is added or lost.  Sublimation: when a solid changes to a gas (heat is added)  Dry ice  Boiling: Process that a liquid becomes a gas (heat is added)  Boiling Point – liquid reaches a certain temperature. Different substances have different boiling points  Condensation: process by which a gas changes to a liquid (heat is added)  Beads of water on glass

Gas Liquid Solid Condensation Boiling - Evaporation MeltingFreezing

 Density  Compare density to other substances  Heating properties  Substances respond to heat differently  Solubility  How much does the substance dissolve  Electric properties  Does it conduct electricity  Magnetic properties  Is substance attracted to magnet