The Chemical Equation

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An introduction to chemical reactions and balancing equations.

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The Chemical Equation

  1. 1. The Chemical Equation J. Hervol
  2. 2. The Chemical Equation <ul><li>The chemical equation is a written representation of what happens during a chemical reaction. </li></ul><ul><li>It includes chemical formulas and symbols . </li></ul>J. Hervol
  3. 3. Parts of the Chemical Equation <ul><li>2 H 2 (g) + O 2 (g)  2 H 2 O(g) </li></ul><ul><li>Reactants Products </li></ul><ul><li>“ Yields” </li></ul><ul><li>Coefficient Physical State Symbols </li></ul><ul><li>(g) = gas, (l) = liquid </li></ul><ul><li>(s) = solid, (aq) = aqueous </li></ul>J. Hervol
  4. 4. Representation <ul><li>2 H 2 (g) + O 2 (g)  2 H 2 O(g) </li></ul><ul><li>2 molecules + 1 molecule = 2 molecules </li></ul><ul><li>of hydrogen of oxygen of water </li></ul><ul><li>OR </li></ul><ul><li>2 moles + 1 mole = 2 moles </li></ul><ul><li>of hydrogen of oxygen of water </li></ul><ul><li>OR </li></ul>J. Hervol 4.04 g H 2 + 32.00 g O 2 = 36.04 g H 2 O
  5. 5. Law of Conservation of Mass <ul><li>Notice that the total number of grams of the product produced was equal to the total number of grams of reactants used. </li></ul><ul><li>This is called the Law of Conservation of Mass – </li></ul><ul><li>In a chemical reaction, the total mass of the reactants must equal the total mass of the products. </li></ul>J. Hervol
  6. 6. Law of Conservation of Matter <ul><li>In addition to the masses being equal, the number of times each atom appears in the reactant and product side must be equal. </li></ul><ul><li>This is called the Law of Conservation of Matter – </li></ul><ul><li>In a chemical equation, matter (atoms) can not be created nor destroyed. </li></ul>J. Hervol
  7. 7. Example: <ul><li>2 H 2 (g) + O 2 (g)  2 H 2 O(g) </li></ul><ul><li>Reactants : Products : </li></ul>J. Hervol H - O - H - O - 4 2 4 2
  8. 8. Balance this unbalanced equation: <ul><li>Zn + HCl  ZnCl 2 + H 2 </li></ul>J. Hervol Cl H Zn Reactants 1 1 1 2 Cl 2 H 1 Zn Products 2 X X 2 2
  9. 9. Balance this unbalanced equation: <ul><li>Al 2 O 3 + Pb  PbO + Al </li></ul>J. Hervol Pb O Al Reactants 1 3 2 1 Pb O 1 Al Products 1 2 X 2 3 X 3 X 3 X 3 3
  10. 10. Reactions containing polyatomic ions: <ul><li>Hint: Polyatomic ions can be balanced as a group as long as the groups remains on the product side. </li></ul>J. Hervol
  11. 11. Balance this unbalanced equation: <ul><li>AgNO 3 + BaCl 2  AgCl +Ba(NO 3 ) 2 </li></ul>J. Hervol Ba NO 3 Ag Reactants 1 1 1 1 Ba NO 3 1 Ag Products 2 Cl Cl 2 1 2 X 2 X 2 2 X 2 X 2

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