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

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 form or appearance of matter changes but not its 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
tearing
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
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
Leaves turning in fall
Spoiled food

21. Chemical Changes
Lightning bug
Antacid tablet

22. Physical or Chemical orange Orange juice Orange cake Copper jewelry
Statue of Liberty
copper
Physical
Chemical

23. Law of Conservation of Mass
The total mass of matter before and after a physical or chemical change is the same.
Matter cannot be created or destroyed
The particles inside the matter rearrange to form new substances

24. Law of Conservation of Mass
Even though it appears that part of the candle disappears, it is just turned into a gas.
proven by
Antoine Lavoisier

25. Directions: Take out all of the laminated cards
Directions: Take out all of the laminated cards. Find the “Physical Change” and “Chemical Change” cards.
As a table, look at the picture and read the description on the back. Decide whether your group thinks each one is a physical change or a chemical change.
Physical Change
Chemical Change