Physical changes alter the state or form of a substance without changing its chemical identity, and are reversible. Chemical changes transform one or more substances into new substances with different properties, are indicated by color changes, formation of precipitates or gas bubbles, production of heat or light, and are not easily reversible. Physical and chemical changes can be distinguished by whether the identity of the substance is conserved and if the change is reversible.

1. Changes in Matter

2. Physical change = a change in the state or form of a substance without changing the identity of the substance

3. Clue #1: change in size, shape or form PHYSICAL CHANGE

4. PHYSICAL CHANGE

5. Clue #2: change in state PHYSICAL CHANGE

7. Clue #3: the change is reversible PHYSICAL CHANGE

8. Chemical change = the alteration of a substance into one or more new substances with different properties

9. a chemical change is the transformation of one or more substances into new substances with new properties

10. CHEMICAL CHANGE Clue #1: colour change

11. Clue #2: a precipitate forms

12. Clue #3: bubbles of gas are produced

13. Clue #4: heat or light are produced

14. Clue #5: the change is difficult to reverse CHEMICAL CHANGE