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Law of Conservation of Mass: Definition, Examples, and Chemical Equations

Learn about the law of conservation of mass, which states that mass cannot be created or destroyed in a chemical reaction. Explore chemical symbols, formulas, and equations that demonstrate this law.

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Law of Conservation of Mass: Definition, Examples, and Chemical Equations

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  1. SPI 0807.9.11 Law of Conservation of Mass Notes Science Bellwork: Write the definition for “law of conservation of mass” in your notebook Law of conservation of mass-the law states that mass cannot be created or destroyed in a chemical reaction

  2. SPI 0807.9.11 Law of Conservation of Mass Notes Science Tennessee SPI Objective: Recognize that in a chemical reaction the mass of the reactants is equal to the mass of the products. (Law of Conservation of Mass: LOCOM) Learning Target I know that the reactants and products have to be equal on both sides of a chemical equation. Success Criteria I can correctly judge if an equation follows the law of conservation of mass.

  3. SPI 0807.9.11 Law of Conservation of Mass Notes Science D3 I’ll roll the dice-you follow the directions! 1-2 Draw It 3-4 Demonstrate It 5-6 Describe It Words to choose from: Atom Element Compound Chemical Symbol Chemical formula

  4. SPI 0807.9.11 Law of Conservation of Mass Notes Science

  5. SPI 0807.9.11 Law of Conservation of Mass Notes Science Dr. Ralston has been found in violation of the law of conservation of mass!!!!! Discuss with your partner the ways she violated the law of conservation of mass.

  6. SPI 0807.9.11 Law of Conservation of Mass Science Notes Key Points About All Chemical Reactions • You start with reactants…you end up with products • Reactants are the "ingredients" and products are what are formed during the reaction. • No atoms are created or destroyed during chemical reactions So no mass is created or destroyed This is called the Law of Conservation of Mass LOCOM

  7. SPI 0807.9.11 Law of Conservation of Mass Science Notes Key Topic Chemical symbols • These are the symbols (letters) that represent the elements from the periodic table. • Each element's chemical symbol starts with one capital letter • H is a chemical symbol (for the element hydrogen) • O is a chemical symbol (for the element oxygen) • Fe is a chemical symbol (for the element iron) • Nais a chemical symbol (for the element sodium) Examples:

  8. SPI 0807.9.11 Law of Conservation of Mass Science Notes Key Topic Chemical Formulas chemical formulas Chemical symbols combined together = Example: Put the symbols H (hydrogen) and O (oxygen) together… …and you get the formula for water… H2O Example: Put the symbols Na (sodium) and Cl (chlorine) together… …you get the formula for sodium chloride… NaCl

  9. SPI 0807.9.11 Law of Conservation of Mass Science Notes Key Topic Chemical Equations Chemical formulas combined together = chemical equations Examples: Equation:2H2 + O2 2H2O Equation:2Na + Cl2 2 NaCl

  10. Quick Review SPI 0807.9.11 Law of Conservation of Mass Science Key Topics To follow the law of conservation of mass, a chemical equation MUST have the same chemical symbols (elements) on both sides of the equation. C+O CO₂

  11. Quick Review SPI 0807.9.11 Law of Conservation of Mass Science Key Topics 2H2 + O2 2H2O Does it follow the law of conservation of mass?

  12. Quick Review SPI 0807.9.11 Law of Conservation of Mass Science Key Topics O2 + He2 2H2O Does it follow the law of conservation of mass?

  13. Quick Review SPI 0807.9.11 Law of Conservation of Mass Science Exit Ticket • Do these formulas follow the law of conservation of mass? How do you know? • H + O OH • PbNa+HOHPbOH+NaH • COHe COH • NeAr+MgAr • NaCl CHO

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