1. Physical and Chemical Changes

2. Matter has properties
Two basic types of properties that we can associate with matter.
Physical properties
Chemical properties

3. Matter Matter is everywhere.
Matter is anything that takes up space and has mass.
Matter is constantly experiencing both chemical and physical changes.

4. Physical Change
Physical changes occur when matter changes its property but not its chemical nature.
Physical property changes could include a change in: texture, shape, size, color, volume, mass, weight, and density.

5. Examples of Physical Changes
Boiling
Freezing
Dissolving
Breaking
Making a mixture
2 or more types of matter (substances) mixed together
Not in specific amounts
Can be separated physically

6. Chemical Change
Chemical changes are changes matter undergoes when it becomes new or different matter.
To identify a chemical change look for signs such as color change, bubbling and fizzing, light production, smoke, and presence of heat.

7. Evidence of a Chemical Change
Evidence of a chemical reaction
Formation of gas
Formation of precipitate
Change in color
Change in energy
Endothermic Absorbs heat energy (gets cold)
Exothermic Releases heat energy (gets hot)

8. Chemical Changes The composition of the substance changes.
The substances present at the beginning of the change are not present at the end; new substances are formed. The change cannot be “undone.”

9. Is it a chemical or physical change?
Sugar dissolving in tea
Chemical Change
Physical Change

10. Physical Change Correct!

11. Is it a chemical or physical change?
Logs burning
Chemical Change
Physical Change

12. Chemical Change Correct!

13. Is it a chemical or physical change?
Breaking water up by separating it into hydrogen and oxygen
Chemical Change
Physical Change

14. Chemical Change Correct!

15. Is it a chemical or physical change?
Cutting paper
Chemical Change
Physical Change

16. Physical Change Correct!

17. Is it a chemical or physical change?
Crushing an aspirin
Chemical Change
Physical Change

18. Physical Change Correct!

19. Is it a chemical or physical change?
Metal rusting
Chemical Change
Physical Change

20. Chemical Change Correct!

21. Is it a chemical or physical change?
Lighter fluid burning
Chemical Change
Physical Change

22. Chemical Change Correct!

23. Is it a chemical or physical change?
An egg rotting
Chemical Change
Physical Change

24. Chemical Change Correct!

25. Is it a chemical or physical change?
An egg breaking
Chemical Change
Physical Change

26. Physical Change Correct!

27. Writing Activity
Write a paragraph about the difference between a chemical and physical change. Give examples of each.