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SPI 0807.9.10 Reactants & Products SPI 0807.9.11 Law of Conservation of Mass

Bellwork. SPI 0807.9.10 Reactants & Products SPI 0807.9.11 Law of Conservation of Mass. Turn to page 340, and read the 3 rd paragraph about reactants and products. 1) Contrast reactants and products (how are they different?)

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SPI 0807.9.10 Reactants & Products SPI 0807.9.11 Law of Conservation of Mass

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  1. Bellwork SPI 0807.9.10 Reactants & Products SPI 0807.9.11 Law of Conservation of Mass • Turn to page 340, and read the 3rd paragraph about reactants and products. • 1) Contrast reactants and products (how are they different?) • 2) Look at the formula below. Identify the reactants and products C + O2 CO2 1

  2. Bellwork SPI 0807.9.10 Reactants & Products SPI 0807.9.11 Law of Conservation of Mass • Contrast reactants and products (how are they different?) • Reactants-starting materials in a chemical reactions • Always written before the arrow C + O2 CO2 1

  3. Bellwork SPI 0807.9.10 Reactants & Products SPI 0807.9.11 Law of Conservation of Mass • Contrast reactants and products (how are they different?) • Reactants-starting materials in a chemical reactions • Products-substances formed in a chemical reaction • Always written after the arrow C + O2 CO2 1

  4. Notes SPI 0807.9.10 Reactants & Products SPI 0807.9.11 Law of Conservation of Mass • 3 key Topics • Chemical symbols • Chemical Formulas • Chemical Equations

  5. Notes SPI 0807.9.10 Reactants & Products SPI 0807.9.11 Law of Conservation of Mass Key Topics Chemical symbols Examples: H is just a chemical symbol (for the element hydrogen) O is just a chemical symbol (for the element oxygen)

  6. Notes SPI 0807.9.10 Reactants & Products SPI 0807.9.11 Law of Conservation of Mass Key Topics Chemical formulas Chemical symbols combined together = chemical formulas Examples: Put the symbols H and O together… And you get the formula for water… H2O

  7. Notes SPI 0807.9.10 Reactants & Products SPI 08079.11 Law of Conservation of Mass Key Topics Chemical symbols & Chemical Formulas • Very Important!!! • symbols & formulas must be written correctly. • CO2= one carbon atom, two oxygen atoms • CO= one carbon atom, one oxygen atom • Co=one cobalt atom • 2CO= two carbon atoms, two oxygen atoms • 2CO2= two carbon atoms, four oxygen atoms

  8. Notes SPI 0807.9.10 Reactants & Products SPI 08079.11 Law of Conservation of Mass Key Topics Chemical symbols & Chemical Formulas QUICK REVIEW! CO2 Is this a chem symbol or chem formula? Is this a mixture or a compound? How many total atoms does it contain? Identify the individual atoms.

  9. Notes Nov 5, 2012 SPI 0807.9.10 Reactants & Products SPI 08079.11 Law of Conservation of Mass Key Topics Chemical symbols & Chemical Formulas QUICK REVIEW! CO2 Is this a chem symbol or chem formula? It is a chemical formula

  10. Notes SPI 0807.9.10 Reactants & Products SPI 0807.9.11 Law of Conservation of Mass Key Topics Chemical symbols & Chemical Formulas QUICK REVIEW! CO2 Is this a mixture or a compound? It is a compound

  11. Notes SPI 0807.9.10 Reactants & Products SPI 08079.11 Law of Conservation of Mass Key Topics Chemical symbols & Chemical Formulas QUICK REVIEW! CO2 How many total atoms does it contain? Three

  12. Notes SPI 0807.9.10 Reactants & Products SPI 0807.9.11 Law of Conservation of Mass Key Topics Chemical symbols & Chemical Formulas QUICK REVIEW! CO2 Identify the individual atoms. = one carbon atom, two oxygen atoms

  13. Notes SPI 0807.9.10 Reactants & Products SPI 0807.9.11 Law of Conservation of Mass Key Topics Chemical Equations Chemical formulas combined together = chemical equations Examples: Equation: 2H2 + O2 2H2O Equation:2Na + Cl2 2 NaCl

  14. Notes SPI 0807.9.10 Reactants & Products SPI 08079.11 Law of Conservation of Mass • 2 parts of chemical equations • (1) reactants • (2) products • Reactants:are the things you are combing together…the things you start with in a chemical reaction • Products: are the things that you produce in a chemical reaction… the things you end up with • Example: 2H2 + 02 2H20 • Reactants (H & O) Products (water)

  15. Notes SPI 0807.9.10 Reactants & Products SPI 08079.11 Law of Conservation of Mass • Chemical Equations show how chemical reactions occur, and the must obey the law of conservation of mass • The law of conservation of mass: Atoms are never lost or gained in a chemical reaction, they are just rearranged. • Example: Look at the following equation. It does not obey the law of conservation of mass and is called unbalanced • (count the atoms on each side!) • H2 + O2 H2O • 2 & 2 2 & 1 • Four is not equal to three!

  16. Notes SPI 0807.9.10 Reactants & Products SPI 08079.11 Law of Conservation of Mass • Balancing Equations: make sure the number of reactants atoms equals the number of products atoms. If they are not equal, you must balance the equation • (See below for an example) • Same equation, but now I have balanced it • (count the atoms on each side) • 2H2 + O2 2H2O • Coefficient=number in front of a chemical symbol or formula (tells you to multiply) • Subscript=small number below and to the right of a chemical symbol (tells you the number of atoms) 4 Hyd + 2 Oxy yields 4 Hyd and 2 Oxy 6 reactant atoms is equal to 6 product atoms!

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