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Conservation of Mass

Conservation of Mass. Chapter 16.2 page 660-665. What does this say?. “U Wn2 gt pza 2nite?”. What about this: “No. MaB TPM. CUL8R.”. Chemical Equation. Like texting, chemical equations are a shorter, easier way to describe a chemical reaction.

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Conservation of Mass

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  1. Conservation of Mass Chapter 16.2 page 660-665

  2. What does this say? “U Wn2 gt pza 2nite?” What about this: “No. MaB TPM. CUL8R.”

  3. Chemical Equation • Like texting, chemical equations are a shorter, easier way to describe a chemical reaction. • Chemical equationsuse chemical formulas and other symbols instead of words to summarize a reaction.

  4. Products and Reactants • A chemical formula shows what you start with and what you get from a chemical reaction. • The substances you have at the beginning are called reactants. • After the reaction, the substances you have left are the products.

  5. The reactants are what you have at the ________ of a chemical reaction. • Start • End • Equal • Look like

  6. The products are what you have at the ________ of a chemical reaction. • Start • End • Middle

  7. What are the reactants in this chemical equation? • H2 • Cl2 • 2HCl • H2 + Cl2 H2 + Cl22HCl

  8. What are the reactants in this chemical equation? • Methane and Oxygen • Methane • Carbon dioxide • Carbon dioxide and water Methane + Oxygen Carbon Dioxide + Water CH4 + 2O2 CO2 + 2H2O

  9. What are the reactants in this equation? • 2H2 • 2H2 + O2 • 2H2O • O2 2H2 + O2 2H2O

  10. What are the products in this chemical equation? • H2 • Cl2 • 2HCl • H2 + Cl2 H2 + Cl22HCl

  11. What are the products in this chemical equation? • Methane and Oxygen • Methane • Carbon dioxide • Carbon dioxide and water Methane + Oxygen Carbon Dioxide + Water CH4 + 2O2 CO2 + 2H2O

  12. What are the products in this equation? • 2H2 • 2H2 + O2 • 2H2O • O2 2H2 + O2 2H2O

  13. Conservation of Mass • Matter is not created or destroyed during a chemical reaction.

  14. Conservation of Mass • The total mass of the reactants equals the total mass of the products.

  15. In the demonstration with vinegar and baking soda, what are the reactants?CH3CO2H + NaHCO3 ---> CH3CO2Na + H2O + CO2 • Vinegar • Baking soda • Vinegar and Baking Soda • Carbon Dioxide

  16. In the demonstration with ice melting, what is the product? • Ice • Water • Ice and water • Carbon dioxide

  17. The law of conservation of mass states: “Matter is neither created or ______ in a chemical reaction.” • Seen • Destroyed • Consumed • Used

  18. If the mass of the reactants in a chemical reactions is 156 g, what is the mass of the products? • 156 g • 200 g • 0 g • 78 g

  19. If I start with ice water that has a mass of 22 g and the ice melts, what should be the mass of the water that is left? • 18 g • 94 g • 88 g • 22 g

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