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Balancing Chemical Equations
Law of Conservation of Matter ,[object Object]
LCM continued ,[object Object]
ANATOMY OF AN EQUATION ,[object Object],[object Object],[object Object],H 2 (g)  +  O 2 (g) H 2 O(l) reactants yield products
DIATOMIC ELEMENTS ,[object Object],[object Object],[object Object]
these are the diatomics
BALANCING EQUATIONS ,[object Object],[object Object],[object Object],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
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

  • 2.
  • 3.
  • 4.
  • 5.
  • 6. these are the diatomics
  • 7.
  • 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. 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. 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. 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. 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. 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