1. Chemical Reactions
8th 5.1 Chemical Reactions

2. Chemical Reactions
Physical changes- same substance changing form (solid, liquid, gas)
Chemical changes-formation of a new substance
Chemical reaction-a process where chemical changes occur
Chemical equations-symbols used to describe a reaction

3. 1. Color change
2. Bubbles form
3. Light is emitted
4. Temperature change
5. Precipitate forms

4. Chemical Reactions Reactants-substances that react.
Product-new substances created.
Chemical formula
H2 + O2  H2O + O
C2H4O2+NaHCO3 (Reactants) 
NaC2H3O2+H2O+CO2 (Product)
6 CO2 + 6 H2O  C6H12O6 + 6 O2

5. Chemical Reactions
Conservation of Mass-the mass of the reactants always equals the mass of the products
Endothermic reaction-energy is absorbed (cold)
Exothermic reaction-energy is released (warm)

8. Physical or Chemical Change
1. Making a cake
2. Rotting fruit
3. Water evaporating
4. Soil erosion
5. Boiling an egg
6. Butter melting
7. Soda freezing
8. Making bread
9. Chopping wood
10. Burning wood
11. Chewing food
12. Silver tarnishing
13. Metal rusting
14. Popcorn popping