1. Physical and Chemical Changes

2. Physical and Chemical Properties Everything around us has physical and chemical properties.

3. Physical Properties Characteristics you can observe without changing the substance into something new. –Use your senses to describe –state of matter –measurement

4. Use your senses… How does it look, smell, sound, feel, taste (don’t taste it unless the teacher says it’s ok)

5. What state of matter is it? (solid, liquid, or gas)

6. Measure it….mass, weight, volume, length, width, height, density, temperature, magnetic?

7. Physical Properties List as many physical properties as you can Color Temperature Feel Smell State Weight Length Density

8. Chemical Properties Will it burn, explode, react with other elements? Characteristics that you can only observe by changing the substance into something new. –You can’t always tell chemical properties just by looking

9. Chemical Properties List as many chemical properties as you can Will it burn Will it explode Can it react with other things

10. Physical and Chemical Changes Matter around us can undergo changes. Physical Changes Chemical Changes

11. Physical Change A change in which the state or energy level of something changes but not its chemical composition –Change of state –Change of shape –Dissolving

12. Physical Changes changing state melting – solid to liquid condensation – gas to liquid freezing – liquid to solid sublimation – solid to gas vaporization – liquid to gas deposition – gas to solid

13. Changes in States

14. Physical Changes change of shape Matter can change shape cutting chewing grinding crumpling bending

15. Physical Changes dissolving When you mix or dissolve one thing into another, it is a physical change

16. Chemical Change A change in which the composition of matter changes and new substances are formed. Chemical bonds are formed and broken. –It cannot be turned back into the original substance

17. Chemical Change Signs that a chemical change may have taken place –Color change –Absorption or release of energy –Odor –Formation of gases or solids –Can’t be reversed

18. Chemical Changes Iron + oxygen and water = rust silver + oxygen and water = tarnish

19. Chemical Changes Burned wood Cooked food

20. Chemical Changes Digestion Spoiled food

21. Chemical Changes Lightning bug Antacid tablet

22. Physical or Chemical Copper jewelry Statue of Liberty orangeOrange juiceOrange cake copper Physical Chemical PhysicalChemical