1. What’s the MATTER: Classify Changes of Matter

2. Matter, Classify Changes of Matter At the conclusion of our time together, you should be able to: 1. Characterize various changes of matter 2. Recognize that a change of state in matter is a physical change

3. Interesting Signs:

4. Physical Physical Change  A change in matter from one form to another without changing its chemical properties  (most can be reversed)  No change in atoms/molecules

5. Physical Change  Examples = Change in state or phase change Dissolving Compressing Light emission/absorption Electrons passing through metals

6. Physical Change More Examples =  boiling of a liquid  melting of a solid  dissolving a solid in a liquid to give a homogeneous mixture  making a solution

7. Chemical Chemical Change Bonds are made / broken Change in oxidation states Bonds are made / broken Change in oxidation states Cl -1 2121 Li +1

8. Examples of Chemical Change  Chemical change or chemical reaction — transformation of one or more atoms or molecules into one or more different molecules. Burning hydrogen (H 2 ) in oxygen (O 2 ) gives H 2 O.Burning hydrogen (H 2 ) in oxygen (O 2 ) gives H 2 O.

9. Sure Signs of a Chemical Change “Chemists Get Practice Trying Labs”  Color Change  Gas Produced (not from boiling!)  Precipitate – a solid formed by mixing two liquids together  Temperature Change  Light

10. Will This be on the Test????

11. Remember the Law of Conservation of Mass  In a physical change or a chemical reaction, mass is neither created or destroyed (Antoine Lavoisier)

12. Matter, Classify Changes of Matter Let’s see if you can: 1. Characterize various changes of matter 2. Recognize that a change of state in matter is a physical change

13. Physical vs. Chemical Change  Examples: melting flame produced paper cut dissolving salt in water tarnishes in air physical chemical physical chemical

14.  Examples: rusting iron mixing mud and water burning a log freezing water grinding spices Physical vs. Chemical Change chemical physical chemical physical

15.  A difference between physical change and chemical change is that 1. chemical change involves energy while physical change does not. 2. physical change involves energy while chemical change does not. 3. different kinds of molecules are present after a physical change but not after a chemical change. 4. different kinds of molecules are present after a chemical change but not after a physical change

16. In making a pizza, which process involves a chemical change? 1.Mixing spices for the sauce 2.Slicing pepperoni for the topping 3.Spreading cheese on the pizza 4.Baking the dough to form the crust In making a pizza, which process involves a chemical change? 1.Mixing spices for the sauce 2.Slicing pepperoni for the topping 3.Spreading cheese on the pizza 4.Baking the dough to form the crust

17. All You Really Need To Know You Can Learn From Noah's Ark 11.Remember that the ark was built by amateurs; the Titanic was built by professionals. 12.Remember that woodpeckers inside are a larger threat than the storm outside.