1. Types of Reactions

2. Five Types of Reactions
There are five different types of reactions
Synthesis/Combination Reaction
Combustion Reaction
Decomposition Reaction
Single-replacement Reaction
Double-replacement Reaction

4. Synthesis/Combination Reaction
Two or more substances react to produce a single product

5. CaO(s) + H2O(l)  Ca(OH)2(s)
A+B AB
2Fe(s) + 3Cl2(g)  2FeCl3(s)
CaO(s) + H2O(l)  Ca(OH)2(s)
To tell if it is a synthesis/combination reaction, one product is formed from two or more reactants
Soda: carbon dioxide plus water produce carbonic acid

6. Combustion Reaction
In a combustion reaction oxygen combines with a substance and releases energy.
Oxygen (O2) is a reactant in a combustion reaction
2H2(g) + O2(g)  2H2O(g)

7. Using a Bunsen burner—Combustion of methane
In the combustion of a hydrocarbon (molecule with just hydrogen and carbon) water and carbon dioxide are produced
Using a Bunsen burner—Combustion of methane
CH4(g) + O2(g)  CO2(g) + H2O(g)
Lighting an outdoor gas grill—Combustion of propane
C3H8 + 5O2 → 3CO2 + 4H20
Using a disposable lighter—Combustion of butane
2C4H O2 → 8CO2 + 10H2O

9. Decomposition Reaction
In a decomposition reaction a single compound breaks down into two or more new elements or compounds + 

10. AB  A + B
2NaN3(s)  2Na(s) + 3N2(g)
One reactant breaks up into two or more products.
To tell if it is a decomposition reaction, there is only one reactant forming two or more products

12. Single Replacement Reactions
Single replacement reactions are when atoms of one element replace the atoms of another element in a compound +  +
Like a “girlfriend thief”

13. A + BX  AX + B
2Li(s) + 2H2O(l)  2LiOH(aq) + H2(g)
To tell if it is a single replacement reaction, a metal, H2 or a halogen is by itself.

15. Double Replacement Reactions
A double replacement reaction is when there is an exchange of ions between two compounds. 
Like “Wife Swap”

16. AX + BY  AY + BX
Ca(OH)2(aq) +2HCl(aq)  CaCl2(aq) + 2H2O(l)
To tell if it is a double replacement reaction, there are two compounds reacting with each other forming two different compounds