1. Bell Ringer
Is it possible for an object or substance to have both a physical and a chemical property? Explain.

2. Changes in Matter (Page 77)
Essential Question
How can you tell that a physical or chemical change in matter has taken place?

3. 1 - Physical Changes of Matter
*A change that affects one or more physical properties of matter **Doesn’t change what it is

6. **Its all water, just in different physical states/phases/forms

7. 2 - Chemical Changes of Matter
*A change that occurs when matter reacts with other matter and changes into different matter

10. Evidence of a chemical change
*Change in odor
*Change in color (sometimes)
*Change in temperature
*A precipitate forms (solid)
*Light or heat given off
*Formation of gases (bubbles, smoke)
*Impossible or hard to reverse

11. Topic: Changes of Matter
Essential Question
How can you tell that a physical or chemical change in matter has taken place?

12. Law of Conservation of Mass
*When matter changes (physical or chemical), mass is not created or destroyed.

13. Law of Conservation of Mass
Physical Change

14. Law of Conservation of Mass
*In chemical changes, the mass of the old substances equals the mass of the new substances.

15. Review
*What is a physical change? Examples
*What is a chemical change? Examples
*How can we tell a chemical change has taken place? Examples
*What is the law of conservation of mass? Examples

16. Conclusion Quick Write
1 - How can you tell that a physical change has taken place?
2 – How can you tell a chemical change has taken place?