1. PS5: Changes in Matter & Energy Investigate and understand changes in matter and the relationship of these changes to the Law of Conservation of Matter, including: A. Physical changes B. Chemical changes C. Nuclear reactions

2. Learning Objectives: I will… 1. Compare and contrast chemical and physical changes Language Objectives: I will… 1. Read about chemical and physical changes and write notes and definitions to vocabulary 2. Discuss with a partner the difference between chemical and physical changes

3. Key Vocabulary  Chemical Change  Physical Change  Chemical Reaction  Endothermic  Exothermic  Mass  Chemical Equation  Reactants  Products  Fission  Fusion

4. Changes… p. 251  Matter can undergo changes.  2 types:  Physical changes  Chemical changes

5. Physical Changes  Any change that alters the form or appearance of a substance but does NOT change it into another substance  THE COMPOSITION OF THE SUBSTANCE DOES NOT CHANGE  Examples: cutting paper, crushing can, melting, freezing, boiling

6. Think Pair Share: Even#: What is a physical change? Odd #: Give as many examples of a physical change as you can.

7. Chemical Changes  A change in matter that produces one or more new substances  The atoms rearrange to form a new substance  Chemical bonds break and new ones formed  It results in different physical properties than the original substances  Substances that undergo the chemical changes are called reactants.  The new substances formed are products.

8. SUHUPU: Taller person: What is a chemical change? Vertically challenged person: Give as many examples of a chemical change as you can.

9. Chemical & Physical Changes Sort Activity  Sort the cards into appropriate categories. Once you have all the cards placed, copy down your results in your notes.

10. Evidence of a Chemical Reaction  Formation of a Precipitate  A solid that forms from liquids during a chemical reaction  Ex: lemon juice & milk  Gas is Produced  Often seen as bubbles  Example: vinegar and baking soda

11. Evidence, cont.  Color Change  Often signals a new substance has formed  Ex: apple or avocado turning brown

12. Think-Write-Round Robin  In your notes, write down two times you have observed a chemical reaction. Explain how you know a chemical reaction took place.  When told to, share with your table in a round- robin fashion.

13. Changes in Energy  When bonds are broken, energy is required.  When bonds are formed, energy is released.  Exothermic Reaction: energy is released  Usually felt as heat  Think: Exo – Heat EXITS  Endothermic Reaction: energy is absorbed from nearby matter  Usually felt as cold  Think: Endo – Heat IN