Chemical Reactions 8th 5.1 Chemical Reactions.

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Presentation transcript:

Chemical Reactions 8th 5.1 Chemical Reactions

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

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

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

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)

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