1.  1. What is the difference between chemical and physical properties?  2. How do you know when a physical change has taken place?  3. How do you know when a chemical change has taken place? Essential Questions:

2. Chemical and Physical Properties Cornell Notes Physical Properties: any characteristics of matter that can be observed without changing the identity of the material. Color, shape, smell, taste, mass, volume, what state of matter it is (freezing point,melting point, etc…), and density (mass/volume) are all physical properties. Physical properties of bases: slippery, taste bitter, and have a Ph level above 7. Properties of acids: taste sour, Ph below 7, burns.

3.  Chemical Properties: characteristics of matter that allow it to change to a different type of matter. These properties have characteristics that cannot be observed without altering the identity of the substance (chemical bond has taken place).  Examples of chemical properties:  1. Is it combustible (will it react with air and accelerant to create heat?)  2. Is it flammable (will it burn?)6. Is there a temp.  3. Will it rust (is it reactive?) change (up or  4. Did a color change take place? Down?)  5. Did it create a gas (bubbles?) Chemical and Physical Properties (Cont’d):

4. Chemical properties of acids and bases. Chemical properties of acids and bases: Strong acids react with and corrode metals. Strong acids and bases are equally dangerous. An acid and a base will combine to form salt.

5. Examples of Physical and Chemical change: Physical Change:  crushing a can  melting an ice cube  boiling water  mixing sand and water  breaking a glass  dissolving sugar and water  shredding paper  chopping wood  mixing red and green marbles  sublimating dry ice Chemical Change:  rusting of iron  combustion (burning) of wood  metabolism of food in the body  mixing an acid and a base, such as hydrochloric acid (HCl) and sodium hydroxide (NaOH)  cooking an egg (burning any food).  digesting sugar with the amylase in saliva  mixing baking soda and vinegar to produce carbon dioxide gas  baking a cake  electroplating a metal  using a chemical battery