1. Chapter 6 – 3 Warm - Up
1. What are the 6 different types of chemical reactions we talked about in class?
2. What type of reaction is:
2 Na + Cl2  2 NaCl
3. What type of reaction is:
2Al + 3CuCl2  2AlCl3 + 3Cu
4. What type of reaction is:
2H20  2H2 + 02

2. Chapter 6 – 3 Chemical Reactions
Balancing Chemical Reactions

3. Balancing Equations
Chemical Equation – representation of a chemical reaction that uses symbols to show the relationship between reactants and products
Account for conservation of mass

4. Balancing Equations Methane + oxygen  carbon dioxide + water
CH4 + O2  CO2 + H2O

5. 1. H2 + O2  H2O H2 + O2  H2O H2 + O2  2H2O 2H2 + O2  2H2O
Reactants Products
H H 2
O O 1
H2 + O2  H2O
H2 + O2  2H2O
2H2 + O2  2H2O
Reactants Products
H H 4
O O 2
Reactants Products
H H 4
O O 2

6. 2. HgO  Hg + O2 HgO  Hg + O2 2HgO  Hg + O2 2HgO  2Hg + O2
Reactants Products
Hg Hg 1
O O 2
HgO  Hg + O2
2HgO  Hg + O2
2HgO  2Hg + O2
Reactants Products
Hg Hg 1
O O 2
Reactants Products
Hg Hg 2
O O 2

7. 3. CO2 + H2O  C6H12O6 + O2 CO2 + H2O  C6H12O6 + O2
Reactants Products
C C 6
H H 12
O O 8
CO2 + H2O  C6H12O6 + O2
CO2 + 6H2O  C6H12O6 + O2
6CO2 + 6H2O  C6H12O6 + O2
6CO2 + 6H2O  C6H12O6 + 6O2
Reactants Products
C C 6
H H 12
O O 8
Reactants Products
C C 6
H H 12
O O 8
Reactants Products
C C 6
H H 12
O O 18

8. 4. Na + H2O  NaOH + H2 Na + H2O  NaOH + H2 Na + 2H2O  NaOH + H2
Reactants Products
Na Na 1
H H 3
O O 1
Na + H2O  NaOH + H2
Na + 2H2O  NaOH + H2
Na + 2H2O  2NaOH + H2
2Na + 2H2O  2NaOH + H2
Reactants Products
Na Na 1
H H 3
O O 1
Reactants Products
Na Na 2
H H 4
O O 2
Reactants Products
Na Na 2
H H 4
O O 2

9. 5. H3PO4  H4P2O7 + H2O H3PO4  H4P2O7 + H2O 2H3PO4  H4P2O7 + H2O
Reactants Products
H H 6
P P 2
O O 8
H3PO4  H4P2O7 + H2O
2H3PO4  H4P2O7 + H2O
Reactants Products
H H 6
P P 2
O O 8

10. Determining Mole Ratios
Mole Ratio – relative number of moles of the substance required to produce a given amount of product in a chemical reaction
2H2O  2H2 + O2
2 : 2 : 1