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The Joy of
Balancing Equations
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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!
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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.
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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
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Balancing Equations Warm up Answers
1.2H2 + O2 2H2O
2. 2HgO 2Hg + O2
3. 6CO2 + 6H2O C6H12O6 + 6O2
4. Zn + 2HCl ZnCl2 + H2
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Balancing Equations Classwork
5. SiCl4 + H2O H4SiO4 + HCl
6. Na + H2O NaOH + H2
7. H3PO4 H4P2O7 + H2O
*8. C7H6O2 + O2 CO2 + H2O
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Balancing Equations Classwork
5. SiCl4 + 4H2O H4SiO4 + 4HCl
6. 2Na + 2H2O 2NaOH + H2
7. 2H3PO4 H4P2O7 + H2O
8. 2C7H6O2 + 15O2 14CO2 + 6H2O
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Balancing Equations Classwork
9. H2SO4 + HI H2S + I2 + H2O
10. Al + HCl AlCl3 + H2
11. PCl5 + H2O HCl + H3PO4
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Balancing Equations Classwork Answers
9. H2SO4 + 8HI H2S + 4I2 + 4H2O
10. 2Al + 6HCl 2AlCl3 + 3H2
11. PCl5 + 4H2O 5HCl + H3PO4
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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
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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
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Balancing Equations Warm up
18. Al + FeO Al2O3 + Fe
19. Fe2O3 + H2 Fe + H2O
20. K2O + H2O KOH
21. H2O2 H2O + O2
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Balancing Equations Warm up Answers
18. 2Al + 3FeO Al2O3 + 3Fe
19. Fe2O3 + 3H2 2Fe + 3H2O
20. K2O + H2O 2KOH
21. 2H2O2 2H2O + O2
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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
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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
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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
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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
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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
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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
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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
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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
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Vinegar Reacting With Baking Soda
CH3COOH + NaHCO3 H2O + NaOCOCH3 + CO2