Chemical Equation

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Chemical Equation

• Uses symbols and formulas to represent the
  products and reactants in a chemical reaction
• Equation must contain correct formulas of the
  reactants and the products

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Word Equation

• Reactants and products represented by words
• Methane Oxygen ? Carbon dioxide water
• ? is read as yields

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Formula Equation

• Formulas are substituted for words
• The equation below is the same as the last word
  equation with formulas instead
• CH4 O2 ? CO2 H2O

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Phases On Equations

• Phases of reactants and products can also be
  indicated in the equations
• (s) solid
• (l) liquid
• (g) gas
• (aq) aqueous
• (?) gas product
• (?) precipitate solid product

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Example

• HCl(aq) Zn(s) ? ZnCl2(aq) H2(?)

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Law of Conservation of Matter

• Must always be satisfied in chemical reactions
• Number of each type of atom must be the same on
  both sides of the equation
• Atoms are neither created nor destroyed

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Balancing

• Making the number of each type of atom the same
  on both sides of an equation
• Coefficient whole numbers placed in front of
  the formulas
• You can only change coefficients when balancing
  you can never change subscripts

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Balance The Following

• CH4 O2 ? CO2 H2O
• Fe H2O ? Fe3O4 H2