Balancing Chemical Equations
Law of Conservation of Matter <ul><li>“ Matter is neither created nor destroyed, only changed from one form to another.” <...
LCM continued <ul><li>Every reaction that takes place in nature or in the laboratory must have the same number of atoms on...
ANATOMY OF AN EQUATION <ul><li>Letter in parenthesis tells state of matter </li></ul><ul><li>notice H and O with their sub...
DIATOMIC ELEMENTS <ul><li>In nature, diatomic elements contain two atoms bonded together, hence di- prefix. </li></ul><ul>...
these are the diatomics
BALANCING EQUATIONS <ul><li>Atom inventory of the whole equation </li></ul><ul><li>Balance atoms by adding  coefficients! ...
Sample Problems
Cu(s)  +  O 2 (g)  Cu 2 O(s) Cu O 1 2 2 1 2 1 2 1 2 2 balanced!!! 4 4 4
K(s)  +  N 2 (g) K 3 N(s) K N 1 2 3 1 3 1 3 2 1 2 6 6 6 BALANCED
Al(s)  +  HCl(aq) AlCl 3 (aq)  +  H 2 (g) Al H Cl 1 1 1 1 2 3 3 1 3 3 6 3 6 6 6 2 6 2 2 2 BALANCED
Co(s)  +  O 2 (g) Co 2 O 3 (s) Co O 1 2 2 3 2 1 2 3 2 6 6 4 4 4 BALANCED
Al 2 O 3 (s)  +  C(s) Al(s)  +  CO 2 (g) Al O C 2 3 1 1 2 1 2 2 2 3 6 6 4 3 3 3 4 BALANCED 4
AgNO 3 (aq)  +  H 2 S(aq) Ag 2 S(s)  +  HNO 3 (aq) Ag N O H S 1 1 3 2 1 2 1 3 1 1 2 2 2 6 2 2 2 6 1 1 BALANCED
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Balancing equations

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Balancing equations

  1. 1. Balancing Chemical Equations
  2. 2. Law of Conservation of Matter <ul><li>“ Matter is neither created nor destroyed, only changed from one form to another.” </li></ul>
  3. 3. LCM continued <ul><li>Every reaction that takes place in nature or in the laboratory must have the same number of atoms on both sides of the equation, or is BALANCED! </li></ul>
  4. 4. ANATOMY OF AN EQUATION <ul><li>Letter in parenthesis tells state of matter </li></ul><ul><li>notice H and O with their subscripts… </li></ul><ul><li>why??? </li></ul>H 2 (g) + O 2 (g) H 2 O(l) reactants yield products
  5. 5. DIATOMIC ELEMENTS <ul><li>In nature, diatomic elements contain two atoms bonded together, hence di- prefix. </li></ul><ul><li>When written by themselves , always get a subscript 2. </li></ul><ul><li>Which ones are diatomic??? </li></ul>
  6. 6. these are the diatomics
  7. 7. BALANCING EQUATIONS <ul><li>Atom inventory of the whole equation </li></ul><ul><li>Balance atoms by adding coefficients! </li></ul><ul><li>You cannot add or change subscripts!!! </li></ul>RULES: (1) save O and H till the end (2) use least common multiple to get numbers equal (3) start with oddest combination or biggest difference
  8. 8. Sample Problems
  9. 9. Cu(s) + O 2 (g) Cu 2 O(s) Cu O 1 2 2 1 2 1 2 1 2 2 balanced!!! 4 4 4
  10. 10. K(s) + N 2 (g) K 3 N(s) K N 1 2 3 1 3 1 3 2 1 2 6 6 6 BALANCED
  11. 11. Al(s) + HCl(aq) AlCl 3 (aq) + H 2 (g) Al H Cl 1 1 1 1 2 3 3 1 3 3 6 3 6 6 6 2 6 2 2 2 BALANCED
  12. 12. Co(s) + O 2 (g) Co 2 O 3 (s) Co O 1 2 2 3 2 1 2 3 2 6 6 4 4 4 BALANCED
  13. 13. Al 2 O 3 (s) + C(s) Al(s) + CO 2 (g) Al O C 2 3 1 1 2 1 2 2 2 3 6 6 4 3 3 3 4 BALANCED 4
  14. 14. AgNO 3 (aq) + H 2 S(aq) Ag 2 S(s) + HNO 3 (aq) Ag N O H S 1 1 3 2 1 2 1 3 1 1 2 2 2 6 2 2 2 6 1 1 BALANCED

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