The Joy of Balancing Equations

So…Let’s practice some more! 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!

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.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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