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5-1 Describing Reactions
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5-1 Describing Reactions

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Transcript

  • 1. Warm-up
    • 1. Draw Bohr’s Model for each of the following:
    • a. Mg b. P c. O d. Ar
  • 2. 5-1 Describing Reactions
    • Objectives:
      • Interpret chemical equations in terms of reactants, products and conservation of mass.
      • Balance chemical equations by manipulating coefficients.
  • 3. Chemical Reactions
    • Chemical reactions are combinations of elements or compound(s) that combine to produce new compound(s).
    • In reactions, compounds change to become other compounds.
    • Reactants
      • Substances that change
    • Products
      • New substances created
    • Coal(carbon) burns in the presence of oxygen to produce carbon dioxide gas
  • 4. Chemical Equations
    • Reactions can be written in short hand.
    • Reactants  Products
    • Carbon + Oxygen  Carbon dioxide
    • C + O 2  CO 2
    • Chemical reactions can be written in sentence or equation form.
  • 5. Conservation of Mass
    • Mass cannot be created or destroyed.
    • Mass can be transferred from one type of matter to another.
    • In a chemical reaction the mass before must equal the mass after the reaction.
    • The mass of the reactants must equal the mass of the products.
  • 6. Conservation of Mass
  • 7. Counting Atoms
    • H 2 O
      • H – 2
      • O – 1
    • CO 2
      • C – 1
      • O – 2
    • Pb(CO 3 ) 2
      • Pb – 1
      • C – 1 x 2 = 2
      • O – 3 x 2 = 6
    • 4 Ga 2 (SO 4 ) 3
      • Ga – 2 x 4 = 8
      • S – 1 x 3 x 4 = 12
      • O – 4 x 3 x 4 = 48
    • Subscripts apply only to the the atom directly before it.
    • Subscripts out side parenthesis distribute inside.
    • Coefficients distribute to both.

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