5-2 Balancing Reactions
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  • Fe + O2 Fe2O3

Transcript

  • 1. 5-2 Balancing Chemical Eq.
    • Objectives:
      • Balance chemical equations by manipulating coefficients.
  • 2. Steps to balancing equations
    • Count the number of atoms or groups of atoms on each side of arrow.
    • Change one or more coefficients until the equation is balanced.
    • N 2 H 4 + O 2  N 2 + H 2 O
  • 3. H 2 + O 2  H 2 O
    • Only 1 oxygen atom “out” (2 “in”)
    H - 2 Only 2 hydrogen “in” (4 “out”) Recount total number of each type of atom 2 2 * Only add coefficients, NEVER Δ subscripts Can you ever make just 1 molecule of water? O - 2 H – 2 O – 1 H – 2 4 O – 1 2 2 ( ) coefficient subscript
  • 4. NaOH  Na 2 O + H 2 O
    • Only 1 sodium atom “in” (2 “out”)
    Recount total number of each type of atom 2 Na – 1 O – 1 H – 1 Na – 2 O – 1 H – 2 O – 1 2 ( ) Na – 1 2 O – 1 2 H – 1 2
  • 5. Order of balancing
    • Polyatomic
    • Metals
    • Nonmetals
    • Hydrogen
    • Oxygen
  • 6. Balancing equation
    • To show mass is conserved, chemical equation must be balanced.
    • Na + H 2 O  NaOH + H 2
  • 7. Balancing equation
    • To show mass is conserved, chemical equation must be balanced.
    • 2 Na + 2 H 2 O  2 NaOH + H 2
  • 8. Balancing equation
    • To show mass is conserved, chemical equation must be balanced.
    • 2 Na + 2 H 2 O  2 NaOH + H 2
    • HCl + CaCO 3  CaCl 2 + CO 2 + H 2 0
  • 9. Balancing equation
    • To show mass is conserved, chemical equation must be balanced.
    • 2 Na + 2 H 2 O  2 NaOH + H 2
    • 2 HCl + CaCO 3  CaCl 2 + CO 2 + H 2 0
  • 10. Balancing equation
    • To show mass is conserved, chemical equation must be balanced.
    • 2 Na + 2 H 2 O  2 NaOH + H 2
    • 2 HCl + CaCO 3  CaCl 2 + CO 2 + H 2 0
    • Al + Cl 2  AlCl 3
  • 11. Balancing equation
    • To show mass is conserved, chemical equation must be balanced.
    • 2 Na + 2 H 2 O  2 NaOH + H 2
    • 2 HCl + CaCO 3  CaCl 2 + CO 2 + H 2 0
    • 2 Al + 3 Cl 2  2 AlCl 3
  • 12. Balancing equation
    • To show mass is conserved, chemical equation must be balanced.
    • 2 Na + 2 H 2 O  2 NaOH + H 2
    • 2 HCl + CaCO 3  CaCl 2 + CO 2 + H 2 0
    • 2 Al + 3 Cl 2  2 AlCl 3
    • K 2 CrO 4 + Pb(NO 3 ) 2  PbCrO 4 + KNO 3
  • 13. Balancing equation
    • To show mass is conserved, chemical equation must be balanced.
    • 2 Na + 2 H 2 O  2 NaOH + H 2
    • 2 HCl + CaCO 3  CaCl 2 + CO 2 + H 2 0
    • 2 Al + 3 Cl 2  2 AlCl 3
    • K 2 CrO 4 + Pb(NO 3 ) 2  PbCrO 4 + 2 KNO 3