1. Balancing, Writing, and Naming Equations
Balancing Equations
Balancing, Writing, and Naming Equations

2. Balancing Equations
Balancing equations is based on the Law of Conservation of Matter:
In a chemical reaction, matter can be neither created nor destroyed.

3. Balancing Equations Paraphrase: Law of Conservation of Atoms:
The number of atoms of each type of element must be the same on each side of the equation.
In a chemical reaction, the amount of reactants equal the amount of products.

4. Rule 1: The subscripts cannot be changed
Hydrogen + oxygen  water
H2 + O2  H2O
If the subscripts are changed, the compound wouldn’t be the same.
Ex. H20 = water
Ex. H2O2 = hydrogen peroxide

5. Deciding If It’s Balanced
H2 + O2  H2O
Draw a table.
Count the atoms on each side.
Are the reactant and product totals the same?

6. Deciding If It’s Balanced
Nitrogen + hydrogen  ammonia
N H2  2 NH3
Draw a table.
Count the atoms on each side.
Are the reactant and product totals the same?

7. Deciding If It’s Balanced
Ca3(PO4)2 + 3 H2SO4  2 CaSO4 + 2 H3PO4

8. Deciding If It’s Balanced
2 Cu + 2 H2SO4  CuSO4 + 2 H2O +SO2

9. Deciding If It’s Balanced
Nickel + hydrochloric acid 
Nickel(II) chloride + hydrogen
2 Ni + 3 HCl  NiCl2 + H2

10. STOP DAY 1

11. Review On what law is balancing equations based?
What is rule number one when it comes to balancing equations? Why?

12. Review
Decide if the following equation is balanced.
2 C6H O2  6 H2O + 12 CO2

13. Target: I can balance a simple chemical equation

14. Balancing Equations H2 + O2 H2O
If the subscripts cannot be altered, how can the atoms be made equal?
Adjust the number of molecules by changing the coefficients.

15. Balancing Equations H2 + O2  H2O
Count the atoms in the initial equation.
Add coefficients and recount.

16. Balancing Equations Balancing hints: Balance the metals first.
Balance the other atoms.
Save the oxygen and hydrogen until the end.

17. Balancing Equations H2 + O2  H2O
Count the atoms in the initial equation.
Add coefficients and recount.

18. Balancing Equations N2 + H2  NH3
Count the atoms in the initial equation.
Add coefficients and recount.

19. Balancing Equations Ca3(PO4)2 + H2SO4  CaSO4 + H3PO4
Count the atoms in the initial equation.
Add coefficients and recount.

20. Balancing Equations Cu + H2SO4  CuSO4 + H2O + SO2
Count the atoms in the initial equation.
Add coefficients and recount.

21. Balancing Equations Balancing hints: Balance the metals first.
Balance the other atoms.
Save the oxygen and hydrogen until the end.

22. Balancing Equations
This method of balancing equations is the inspection method.
The method is trial and error.
You must know if an equation is not balanced.
Practice.
Section 1: #2, 4, 5, 7, 8, 11, 12, 13

23. STOP Day 2

24. Nickel + hydrochloric acid  Nickel(II) chloride + hydrogen
Do Now
Nickel + hydrochloric acid 
Nickel(II) chloride + hydrogen
Write the corresponding formula equation and then balance the equation.

25. Predict the products and balance the following equation
Predict the products and balance the following equation. __ C4H8 + __ O2 
Do Now
04/12/2013

26. 1) Na3PO4 + KOH  NaOH + K3PO4

27. 2) MgCl2 + Li2CO3  MgCO3 + LiCl

28. 3) C6H12 + O2  CO2 + H2O  

29. 4) Pb + FeSO4  PbSO Fe

30. 5) CaCO3  CaO + CO2

31. 6) P4 + O2  P2O3

32. 7) RbNO3 + BeF2  Be(NO3)2 + RbF  

33. 8) AgNO3 + Cu  Cu(NO3)2 + Ag

34. 9) C3H6O + O2  CO2 + H2O

35. 10) C5H5 + Fe  Fe(C5H5)2

36. 11) SeCl6 + O2  SeO2 + Cl2

37. 12) MgI2 + Mn(SO3)2  MgSO3 + MnI4

38. 13) ___ NO2  ___ O2 + ___N2

39. Section 2
1) __ C6H6 + __ O2  __ H2O + __ CO2

40. Section 2
2) __ NaI + __ Pb(SO4)2  __ PbI4 + __ Na2SO4

41. Section 2
3) __ NH3 + __ O2 __ NO + __ H2O

42. Section 2
4) __ Fe(OH)3  __ Fe2O3 + __ H2O

43. Section 2
5) HNO3 + Mg(OH)2  H2O + Mg(NO3)2

44. Section 2
6) H3PO4 + NaBr  HBr + Na3PO4

45. Section 2
7) C + H2  C3H8

46. Section 2
8) CaO + MnI4  MnO CaI2

47. Section 2
9) __ Fe2O3 + __ H2O  __ Fe(OH)3

48. Section 2
10) __ C2H2 + __ H2  __ C2H6

49. Section 2
11) __ VF5 + __ HI  __ V2I10 + __ HF

50. Section 2
12) OsO4 + PtCl4  PtO2 + OsCl8

51. Section 2
13) __ CF4 + __ Br2  __ CBr4 + __ F2

52. Section 2
14) __ Hg2I2 + __ O2  __ Hg2O + __ I2

53. Section 2
15) __ Y(NO3)2 + __ GaPO4  __ YPO4 + __ Ga(NO­3)2

54. Section 2
__ C6H6 + __ O2  __ H2O + __ CO2

55. Section 2
__ C6H6 + __ O2  __ H2O + __ CO2