1. Balancing Equations

2. Law of Conservation of Matter
A natural law describing the fact that matter is neither created nor destroyed in any process
Simply means that:
The amount of matter that you start with has to equal to the amount of matter that you end with

3. Important rules to follow
1. Make sure all compounds are correct.
Important in high school. (diatomics/polyatomics)
2. Go for the largest molecule, and pick the front element of that molecule.
3. Place elements under the arrow and amounts in same order underneath the reactants side and underneath the products side.
4. Leave Oxygen and Hydrogen last.
**5 If one side must be an even number and the other side has an odd number, then multiply the odd number with an even coefficient to make even.

4. ___Mg + ___O __MgO

5. Go to the largest compound List the elements and amount
___Mg + ___O __MgO
1 Mg
2 O

6. __2_Mg + ___O _2_MgO

7. 2 N 1 2 H 3 Go to largest molecule Balance first element
__N2 + __H ____NH3
2 N 1
2 H 3
Go to largest molecule
Balance first element

8. __N2 + _3_H __2__NH3

9. ___Na + ___Cl ____NaCl

10. _2_Na + ___Cl _2__NaCl

11. __Na + __H2O __NaOH + __H2

12. __Na + __H2O __NaOH + __H2
1 Na 1
1 O 1
2 H 3

13. _2_Na + _2_H2O _2_NaOH + __H2

14. __Ca + __H2O __Ca(OH)2 +__H2

15. __Ca + _2_H2O __Ca(OH)2 +__H2

16. Warmups # 1 and 2 Try to balance this one.
Al2O3  Al O2

17. # 2
BaO2  BaO O2

18. #3
Fe CuCl2  FeCl Cu

19. #4
CuCl H2S  CuS HCl

20. 5.
P H2  PH3

21. 6.
O Sb2S3  Sb2O SO2

22. 7.
PaI5  Pa I2

23. 8.
Hf N2  Hf3N4

24. 9.
C12H22O11  C H2O

25. 10.
Fe O2  Fe3O4