1. CLASSIFYING CHEMICAL REACTIONS

2. FIVE BASIC WAYS TO CLASSIFY CHEMICAL REACTIONS:
Synthesis
Decomposition
Single-Replacement
Double-Replacement
Combustion

3. Synthesis Reactions: Generic Reaction X + Y-->XY
Definition-In this equation, X and Y can be compounds or elements. The result XY is a compound.
Analogy- Like a marriage
2 Reactants and 1 Product

4. Examples of Real Synthesis Reactions:
2Ba + O2 -->2BaO
4Cu + O2 -->2Cu2O
2Cu + O2 -->2CuO
2H2 + O2 -->2H2O
C + O2 -->CO2
2Na + Cl2 -->2NaCl 2

5. Decomposition Reactions:
In a decomposition reaction, an compound is broken down into two simpler substances. The generic formula of a decomposition reaction is:
XY --> X + Y
Decomposition reactions are the opposite of synthesis reactions.
Analogy-Like divorce
1 Reactant and 2 Products

6. Examples of Real Decomposition Reactions:
2HgO --> 2Hg + O2
2H2O --> 2H2 + O2
CaCO3 --> CaO + CO2
Cu(OH)2 --> CuO + H2O
2KClO3 --> 2KCl + 3O2 H2SO4 --> SO3 + H2O

7. Single Replacement Reactions:
In this type of reaction, one element replaces a similar element in a compound.
A + XY --> AY + X
In this equation, A, X, and Y are the elements and XY, AY, and XA are the compounds.
Aggressive metal wins
1 free element + compound  compound + 1 free element
Like finding a new girl friend

8. Li Rb K Ca Na Mg Al Mn Zn Fe Ni Sn Pb
Cu Ag PtAu
Metal Reactivity Chart
Most aggressive metal (woman) wins out H

9. Examples of Single Replacement Reactions:
2Al + 3Fe(NO3)2  3Fe + 2Al(NO3)3
Zn + CuCl2 
Mg + Pb(NO3)2 
Fe + Na3PO4 
2K + ZnCl2 

10. Examples of Real Single Replacement Reactions:
2Al + 3Fe(NO3)2  3Fe + 2Al(NO3)3
Zn + CuCl2  Cu + ZnCl2
Mg + Pb(NO3)2  Pb + Mg (NO3)2
Fe + Na3PO4  N.R.
2K + ZnCl2  2 KCl + Zn
Cl2 + 2KBr  2KCl + Br2

11. Double-Replacement Reactions:
In a double-replacement reaction, the two compounds exchange places in a solution to form two new compounds. The general equation of a double-replacement reaction is:
AB + XY --> AY + XB
Like switching partners in square dancing
2 compounds  2 compounds

12. Examples of Real Double-Replacement Reactions:
Pb(NO3)2 + 2KI --> PbI2 + 2KNO3
FeS + 2HCl --> H2S + FeCl2
HCl + NaOH --> NaCl + H2O
“lets take turns dancing with these two beautiful ladies”

13. Combustion Reactions:
When a substance combines with oxygen releasing a large amount of energy in the form of light and heat, it is a combustion reaction.
Oxygen is needed to Burn things.
Generic
C + O2  CO2 + heat

14. Examples of Real Combustion Reactions:
examples of combustion reactions
C3H8 + 5O2 --> 3CO2 + 4H2O + heat
2CH4 + 4O2  2CO2 + 4H2O + heat

15. FIVE BASIC WAYS TO CLASSIFY CHEMICAL REACTIONS:
Synthesis 2 reactants1 product (like marriage)
Decomposition 1 reactant 2 products(like divorce)
Single-Replacement(most aggressive element wins)
Double-Replacement (switch partners)
Combustion=Burning (need oxygen to burn things)