1. Physical and Chemical Changes
Review from Sec 1: - 3 phases of matter changes in phase

3. Physical changes
If we are able to reverse the change, then it is a physical change.
For a physical change, no new substances are created

4. 3 ways to recognize Physical changes
Changing the phase of a substance

5. 3 ways to recognize Physical changes
Changing the phase of a substance
Change the shape of an object

6. 3 ways to recognize Physical changes
Changing the phase of a substance
Change the shape of an object
Prepare or separation of a mixture

7. Chemical changes In a chemical change, the molecules are rearranged.
A chemical change is not reversible.
A chemical change creates a new substance.

8. 5 ways to recognize a chemical change
Change in temperature

9. 5 ways to recognize a chemical change
Change in temperature
Release of light

10. 5 ways to recognize a chemical change
Change in temperature
Release of light
Residue forms

11. 5 ways to recognize a chemical change
Change in temperature
Release of light
Residue forms
Colour change

12. 5 ways to recognize a chemical change
Change in temperature
Release of light
Residue forms
Colour change
Release of gas

13. Did you make or separate a mixture? Colour change
Physical Change Chemical change (3 ways to recognize) (5 ways to recognize)
Did the shape change?
Did the phase change?
Did you make or separate a mixture?
Colour change
Change in temperature
Light released
Gas released
Residue formed

14. Demo 1:
Lead nitrate and sodium iodide

15. Demo 2
Water and phenolphthalein

16. Demo 3
Calcium and water

17. Demo 4
Iodine and heat

18. Demo 5
Cellulose and energy

19. Demo 6
Cellulose and energy

20. The Law of Conservation of mass
Mass can neither be created nor destroyed. It can only be transformed.