1. Physical and Chemical Properties

2. All substances have properties… Including people!
Example:
People can be identified by their …
Face (shape, expressions)
Voice
Height
Finger prints
Eye color
Hair color
Teeth
DNA

3. Physical Properties
Physical properties are used to identify, describe and classify matter.
Characteristic of a substance that can be observed (using your senses) without changing the substance into something else.
Phase
Texture
Color
Odor
Taste
Temperature

4. Creating a new chemical product
Chemical Properties
Chemical properties are characteristics involved when a substance interacts with another substance to change its chemical make-up.
Flammability
Rusting
Creating gas bubbles
Creating a new chemical product
Reactivity with water pH

5. Show Me the Answer!
Use your hand to make a “P” if you think the picture is showing a physical property and a “C” if you think its showing a chemical property.

6. Phase change
Physical

7. Boiling Point Physical Rubbing Alcohol boils at 90 degrees Celsius
Water boils at 100 degrees Celsius

8. Flammability (ability to burn)
Chemical

9. Rusting
Chemical

10. Odor
Physical

11. Carbon Dioxide
CO2
Chemical

12. Physical Changes vs. Chemical Changes..
Now lets talk about
Physical Changes vs. Chemical Changes..
BACK TO THE NOTE SHEET!!!!!

13. Physical Changes
Physical Change: a change in matter that does not change the identity of a substance or produce a new substance—it keeps the same chemical composition.

14. Examples of Physical Changes: Phase changes (solid to liquid to gas)
After: H20 (gas)
Before: H20 (liquid)

15. Examples of Physical Changes:
Breaking, tearing, ripping, cutting, crushing
Homework before
The object’s appearance has changed but the object is still made of the same particles
Still homework after…

16. (still the same chemical makeup.)
Examples of Physical Changes:
Dissolving (A sugar cube is still sugar after it dissolves in water.)
Sucrose (C12H22O11)
Sugar
Water
(still the same chemical makeup.)
Water (H2O)

17. Examples of Physical Changes: Changing size, shape, or amount
Cookie dough AFTER….(just a different shape)
Cookie dough BEFORE….

18. A snowman melting is an example of a physical change
A snowman melting is an example of a physical change. The puddle of water and the snowman are made of the same matter—H20!
H2O molecules as a gas. Particles move fast and are farther apart.
H2O molecules as a solid. Particles are close and vibrate in place.
H2O molecules as a liquid. Particles slide past one another.

19. Chemical Changes
Chemical Change: a change in which a new substance is formed, or when one substance is changed into another (i.e., it changes the chemical composition).

20. Clues of a Chemical Change: A new substance is produced
Iron (Fe)
Rust(Fe2O3)
Oxygen (O2)

21. Clues of a Chemical Change:
Bubbles are produced (indicates presence of a gas)

22. Clues of a Chemical Change:
Change in color or new odor (smell) produced.
Aluminum and Iodine

23. Clues of a Chemical Change:
Energy (heat/light) is given off (substance feels) or taken away (substance feels cool) during the chemical reaction.
Ammonium Experiment

24. Wood will never go back to original form
Clues of a Chemical Change
Irreversible (can’t change it back)*
When you cook something, it can never go back to the original composition.
Wood will never go back to original form

25. During a chemical change, matter with a new chemical composition and new properties is formed. Examples of chemical changes include: the burning of wood, cooking of food, rusting of iron, tarnishing of silver, digestion of food, and souring of milk. All of these are examples of chemical changes because the matter created has new chemical compositions and different properties than the matter from which it was formed.