Chemical Equations

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ChemicalEquations
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Chemical Reactions

• Evidence of a Chem Rxn
• Precipitate
• Gas
• Energy Change
• Bonds broken or new bonds formed

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Chemical Equation

• Is a method of describing a chemical reaction

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Word Equation

• names of reactants and products

Calcium oxygen Calcium oxide
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Formula Equation

• Formulas of reactants and products

Ca (s) O2 (g) CaO (s)
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Chemical Equations are made up of

• Reactants are on the Left side of the equation
  and Products are on the Right side

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• The Arrow symbol used in equations represents
  yields or produces.

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solid (s)liquid (l)gas (g)aqueous (aq)
Phases
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aqueous(aq)

• a substance dissolved in water to make a water
  solution.

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Balanced Equation

• number of atoms on the reactant side is equal to
  the number of atoms on the product side.

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Balanced Equation

• Coefficients are the only thing that may be
  altered in the process of balancing an equation.

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Balanced Equation

• You can never add or change subscripts of a
  formula!!

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Law of Conservation of Matter

• During a chemical reaction atoms are neither
  created nor destroyed.
• Atoms are rearranged only.

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Exothermic

• Reactions that release heat.
• Energy term is on the right

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Endothermic

• Reactions that absorb heat. Energy term is on
  the left

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