1. Indications of Chemical Reaction

2. Chemical Reaction A process by which one or more substances change to produce one or more different substances. A process by which one or more substances change to produce one or more different substances.

3. In a Chemical reaction, the reactants are changed into products. In a Chemical reaction, the reactants are changed into products. Products and reactants have different chemical and physical properties. Products and reactants have different chemical and physical properties. Sometimes the chemical and physical properties in product and reactant are difficult to observe Sometimes the chemical and physical properties in product and reactant are difficult to observe

4. Observations that Indicate a Chemical Reaction

5. 1. Formation of a Precipitate Precipitate: A solid that settles out of a solution Precipitate: A solid that settles out of a solution

6. 2. Formation of a gas (Effervescence)

7. 3. Color Change

8. 4. Energy Changes Heat Heat Light Light Sound Sound

9. 2 Types of Energy Change A. Endothermic A. Endothermic Heat into system Heat into system Gets Cold Gets Cold

10. B. Exothermic B. Exothermic Heat out of system Heat out of system Gets Hot! Gets Hot!

11. The End The End