1. The Joy of
Balancing Equations

2. 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!

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. C7H O2  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