1. The document describes 5 main types of chemical reactions: synthesis, decomposition, single displacement, double displacement, and combustion. 2. Synthesis reactions involve combining two or more reactants to form a single new product. Decomposition reactions involve breaking down a single reactant into simpler products. 3. Single displacement reactions involve one element replacing another in a compound. Double displacement reactions involve the exchange of ions between two reactants to form two new products. 4. Combustion reactions involve hydrocarbons reacting with oxygen to produce carbon dioxide and water.

1. Types of Reactions
1. Synthesis reactions
2. Decomposition reactions
3. Single displacement reactions
4. Double displacement reactions
5. Combustion reactions
You need to be able to identify each type.

2. 1. Synthesis
Example C + O2
O
O
C +  O O
C
General: A + B  AB

3. Ex. Synthesis Reaction

4. Practice
• Predict the products.
Na(s) + Cl2(g) 
Mg(s) + F2(g) 
Al(s) + F2(g) 
NaCl(s)
MgF2(s)
AlF3(s)
2
2
2 3 2
• Now, balance them.

5. 2. Decomposition
Example: NaCl
General: AB  A + B

Cl Na Cl + Na

6. Ex. Decomposition Reaction

7. 3. Single Displacement
Example: Zn + CuCl2

Zn
Cl
Cl
Cu +
General: AB + C  AC + B
Cl
Cl
Zn Cu
+
Zn was oxidized
Went from neutral (0) to (+2)
Cu was reduced
Went from (+2) to Neutral (0)

8. Ex. Single Replacement Reaction

9. Single Replacement Reactions
• Write and balance the following single
replacement reaction equation:
• Zn(s) + HCl(aq)  ZnCl2 + H2(g)
2
• NaCl(s) + F2(g)  NaF(s) + Cl2(g)
• Al(s)+ Cu(NO3)2(aq)
2 2
Cu(s)+ Al(NO3)3(aq)
3 2
3
2

10. 4. Double displacement
Example: MgO + CaS
General: AB + CD  AD + CB
S
O

Mg Ca
+
O
S
Mg Ca
+

11. Double Replacement Reactions
• Think about it like “foil”ing in algebra, first and
last ions go together + inside ions go together
• Example:
AgNO3(aq) + NaCl(s)  AgCl(s) + NaNO3(aq)
• Another example:
K2SO4(aq) + Ba(NO3)2(aq)  KNO3(aq) + BaSO4(s)
2

12. Practice
• Predict the products.
1. HCl(aq) + AgNO3(aq) 
2. CaCl2(aq) + Na3PO4(aq) 
3. Pb(NO3)2(aq) + BaCl2(aq) 
4. FeCl3(aq) + NaOH(aq) 
5. H2SO4(aq) + NaOH(aq) 
6. KOH(aq) + CuSO4(aq) 

13. 5. Combustion Reactions
• Combustion reactions - a
hydrocarbon reacts with
oxygen gas.
• This is also called
burning!!!
• In order to burn something
you need the 3 things in
the “fire triangle”:
• 1) Fuel (hydrocarbon)
2) Oxygen
3) Something to ignite the
reaction (spark)

14. Combustion Reactions
• In general:
CxHy + O2  CO2 + H2O
• Products are ALWAYS
carbon dioxide and water.
(although incomplete burning
does cause some by-products
like carbon monoxide)
• Combustion is used to heat
homes and run automobiles
(octane, as in gasoline, is
C8H18)

15. Combustion
• Example
• C5H12 + O2  CO2 + H2O
• Write the products and balance the
following combustion reaction:
• C10H22 + O2 
5 6
8

16. Mixed Practice
• State the type & predict the products.
1. BaCl2 + H2SO4 
2. C6H12 + O2 
3. Zn + CuSO4 
4. Cs + Br2 
5. FeCO3 