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The Joy of

The Joy of. Balancing Equations. What we already know…. Coefficient  2 CaCl 2 The 2 tells you that there are 2Ca and 4Cl CaCl 2  Subscript The little two tells you that there are 2 Cl. A + B = Not chemically bonded , so its not a compound!

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The Joy of

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  1. The Joy of Balancing Equations

  2. What we already know… • Coefficient 2CaCl2 The 2 tells you that there are 2Ca and 4Cl • CaCl2 Subscript The little two tells you that there are 2 Cl. A+ B = Not chemically bonded, so its not a compound! AB= This is a compound which is chemically bonded. NEVER ADD SUBSCRIPTS! So…Let’s practice some more!

  3. Helpful hints to be successful with Balancing Equations • Remember to… • Draw your line separating the “reactants” from the “products”. • Make a list of the elements on each side. • “Attack” the compounds first! • Save the “Elements” for last. • If you hit a “Dead End” remember to go back and double your coefficients. Try it! • Double check your work so that it is equal on both sides of the equation.

  4. Balancing Equations Warm up Git-R-Done! 1.H2 + O2 H2O 2. HgO  Hg + O2 3. CO2 + H2O  C6H12O6 + O2 4. Zn + HCl  ZnCl2 + H2

  5. Balancing Equations Warm up Answers 1.2H2 + O2 2H2O 2. 2HgO  2Hg + O2 3. 6CO2 + 6H2O  C6H12O6 + 6O2 4. Zn + 2HCl  ZnCl2 + H2

  6. Balancing Equations Classwork 5. SiCl4 + H2O  H4SiO4 + HCl 6. Na + H2O  NaOH + H2 7. H3PO4 H4P2O7 + H2O *8. C7H6O2 + O2 CO2 + H2O

  7. Balancing Equations Classwork 5. SiCl4 + 4H2O  H4SiO4 + 4HCl 6. 2Na + 2H2O  2NaOH + H2 7. 2H3PO4 H4P2O7 + H2O 8. 2C7H6O2 + 15O2 14CO2 + 6H2O

  8. Balancing Equations Classwork 9. H2SO4 + HI  H2S + I2 + H2O 10. Al + HCl  AlCl3 + H2 11. PCl5 + H2O  HCl + H3PO4

  9. Balancing Equations Classwork Answers 9. H2SO4 + 8HI  H2S + 4I2 + 4H2O 10. 2Al + 6HCl  2AlCl3 + 3H2 11. PCl5 + 4H2O  5HCl + H3PO4

  10. Balancing Equations Homework 12. Mg + N2 Mg3N2 13. Fe + H2O  Fe3O4 + H2 14. NaOH + Cl2 NaCl + NaClO + H2O 15. N2 + H2 NH3 16. C3H6 + O2 H2O + CO2 17. N2 + O2 N2O

  11. Balancing Equations Homework Answers 12. 3Mg + N2 Mg3N2 13. 3Fe + 4H2O  Fe3O4 + 4H2 14. 2NaOH + Cl2 NaCl + NaClO + H2O 15. N2 + 3H2 2NH3 16. 2C3H6 + 9O2 6H2O + 6CO2 17. 2N2 + O2 2N2O

  12. Balancing Equations Warm up 18. Al + FeO  Al2O3 + Fe 19. Fe2O3 + H2 Fe + H2O 20. K2O + H2O  KOH 21. H2O2 H2O + O2

  13. Balancing Equations Warm up Answers 18. 2Al + 3FeO  Al2O3 + 3Fe 19. Fe2O3 + 3H2 2Fe + 3H2O 20. K2O + H2O  2KOH 21. 2H2O2 2H2O + O2

  14. Balancing Equations Classwork 22. Al + O2 Al2O3 23. C7H16 + O2 CO2 + H2O 24. Na2O2 + H2O  NaOH + O2 25. SiO2 + HF  SiF4 + H2O 26. N2 + H2 NH3 27. KClO3 KCl + O2 28. H3AsO4 As2O5 + H2O

  15. Balancing Equations Classwork Answers 22. 4Al + 3O2 2Al2O3 23. C7H16 + 11O2 7CO2 + 8H2O 24. 2Na2O2 + 2H2O  4NaOH + O2 25. SiO2 + 4HF  SiF4 + 2H2O 26. N2 + 3H2 2NH3 27. 2KClO3 2KCl + 3O2 28. 2H3AsO4 As2O5 + 3H2O

  16. Balancing Equations Homework 29. KClO3 KClO4 + KCl 30. P4O10 + H2O  H3PO4 31. Na2CO3 + HCl  NaCl + H2O + CO2 32. K + Br2 KBr 33. P4 + O2 P2O5 34. N2O5 + H2O  HNO3 35. Fe2O3 + CO  Fe + CO2

  17. Balancing Equations Homework Answers 29. 4KClO3 3KClO4 + KCl 30. P4O10 + 6H2O  4H3PO4 31. Na2CO3 + 2HCl  2NaCl + H2O + CO2 32. 2K + Br2 2KBr 33. P4 + 5O2 2P2O5 34. N2O5 + H2O  2HNO3 35. Fe2O3 + 3CO  2Fe + 3CO2

  18. Challenging Equations 36. H3BO3  H4B6O11 + H2O 37. H2S + Cl2 S8 + HCl 38. S8 + O2  SO3 39. C3H8 + O2 CO2 + H2O 40. FeS2 + O2 Fe2O3 + SO2

  19. Challenging Equations Answers 36.6H3BO3  H4B6O11 + 7H2O 37.8H2S +8Cl2 S8 + 16HCl 38. S8 + 12O2  8SO3 39. C3H8 + 5O2 3CO2 + 4H2O 40.4FeS2 + 11O2 2Fe2O3 + 8SO2

  20. More Challenging Equations 41. C2H6 + O2  CO2 + H2O 42. H3PO4 + KOH  K3PO4 + H2O 43. CaCO3+H3PO4 Ca3(PO4)2+H2CO3 44. Pb(OH)4+Cu2O  PbO2+CuOH 45. Sn(NO2)4+Pt3N4  Sn3N4+Pt(NO2)4

  21. More Challenging Equations Answers 41. 2C2H6 +7O2  4CO2 + 6H20 42. H3PO4 + 3KOH  K3PO4 + 3H2O 43.3CaCo3+2H3PO4 Ca3(PO4)2+3H2CO3 44. Pb(OH)4+2Cu2O  PbO2+4CuOH 45.3Sn(NO2)4+Pt3N4  Sn3N4+3Pt(NO2)4

  22. Vinegar Reacting With Baking Soda CH3COOH + NaHCO3 H2O + NaOCOCH3 + CO2

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