1. Chemical and Physical Properties and Changes

2. Physical Properties and Changes
Physical Properties are used to observe or describe matter.
How do you observe or describe someone?
Height
Hair Color
Eye Color
Weight
Age
Clothing Color
Let’s describe
Dwight Schrute

3. Physical Properties and Changes
When we observe or describe something or someone we use “drivers license” descriptions.
When we observe or describe MATTER we use some of the same descriptions.

4. List as many physical properties as you can…

5. Physical Properties and Changes
Things you observe and can describe about matter:
Color
Size
Smell
Freezing Point
Melting Point
Mass
Shape
Volume
Density

6. Physical Changes
Do NOT change the structure of matter when it is observed or described.
What does “structure” mean?
How the atoms are stuck together!
Each letter is a different atom, and the lines that connect the letters show the STRUCTURE of the substance.
And here each color represents a different atom and this picture shows the STRUCTURE of the substance.

7. Physical Changes
A physical change involves a change in which the particles/atoms are not rearranged – it is the same substance before and after.
Before Change
After Change

8. Examples of Physical Changes
Shape
The shape of the wood changed. But is it still a piece of wood?

9. Physical Changes
Shape

10. The tip of the nail changed color. But is it still a fingernail?
Physical Changes
Color
The tip of the nail changed color. But is it still a fingernail?

11. The ice cream melted. But does it still taste like ice cream?
Physical Changes
Melting Point
The ice cream melted. But does it still taste like ice cream?

12. What is the “structure” of water?
What is the “structure” of ice?
What is the “structure” of steam?

13. We just observed one of the physical properties of H2O!
PHASE CHANGE: how a substance changes between solid, liquid, and gas
We observed of how H2O is different in each phase, but the structure of H2O never changed!

14. You can think of Physical Changes like changing the font of a word…
Science Class
Science class
The “structure” of the words is still the same, even though the physical appearance changed.

15. Chemical Properties and Changes
And you can think of Chemical Changes like rearranging the letters of the words…
Science Class
Classic Scene
Scenic Scales
Nice Class Sec
Cans Slice Sec
Sacs Licenses

16. Chemical Changes
The letters are the same, but we’ve rearranged the structure and made new words! This is what happens in a chemical change!

17. Chemical Change
A chemical change is when the particles of a substance are broken apart and rearranged.

18. Chemical Changes What are some examples of Chemical Changes?
Flammability
Oxidation
Toxicity
Radioactivity
Sensitivity to Light

19. Chemical Properties and Changes
Flammability:
The ability to catch fire!

20. Chemical Properties and Changes
Oxidation
The ability to react with Oxygen

21. Chemical Properties and Changes
Toxicity
The ability to be poisonous

22. Chemical Properties and Changes
Sensitivity to Light
The ability to change when exposed to light