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Chemical Equation

Chemical Equation. A shorthand way of reporting details of a chemical reaction Reactants The starting substances in a reaction Placed on the left side of the equation Products The substances formed during a chemical reaction Placed on the right side of the equation

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Chemical Equation

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  1. Chemical Equation • A shorthand way of reporting details of a chemical reaction • Reactants • The starting substances in a reaction • Placed on the left side of the equation • Products • The substances formed during a chemical reaction • Placed on the right side of the equation • Arrow is read as yields Episode 604

  2. Coefficients • Used to balance equation • Represent the number of molecules, formula units, or atoms of the substances. • Law of Conservation of Mass • Mass cannot be created or destroyed. Zn + HCl → ZnCl2 + H2 http://www.youtube.com/watch?v=x9iZq3ZxbO8&feature=related 2 Episode 604

  3. 2 2 2 H2 + O2 → H2O • Cannot add or change subscripts • Draw boxes C3H8 + O2 → CO2 + H2O 5 3 4 C = 3 C = 1 3 H = 8 H = 2 8 O = 2 10 O = 3 7 10 Episode 604

  4. Guidelines for Balancing Equations • Start by making an element inventory • Draw boxes around each formula in the equation • Begin with one molecule or formula unit of the substance containing the most atoms • Balance polyatomic ions that appear on both sides of the equation as a single unit • Appears in a reactant and a product • Balance hydrogen and oxygen atoms last Episode 604

  5. Polyatomic Ions? 2 2 Cu + AgNO3 → Cu(NO3)2 + Ag KNO3 → KNO2 + O2 Cu = 1 Cu = 1 Ag = 1 2 Ag = 1 2 NO3 = 1 2 NO3 = 2 2 2 2 K = 1 2 K = 1 N = 1 2 N = 1 2 O = 3 6 O = 4 6 Episode 604

  6. Hydrogen and oxygen combine to produce water H + O → H2O • Reasonable…? • But, wrong H2 + O2 → H2O • 7 Diatomic Elements • Diatomic: two elements • Hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine, iodine Balance it ! 2 2 Episode 604

  7. CS2 O2 CO2 Carbon disulfide reacts with oxygen to produce carbon dioxide and sulfur dioxide. SO2 Balance it ! CS2 + O2→ CO2 + SO2 3 2 C = 1 C = 1 S = 2 S = 1 2 O = 2 6 O = 4 6 Episode 604

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