1. Types of Reactions

2. Classifying Reactions
How can you predict the products if you are given the reactants?
Must know the types of reactions

3. Types of Reactions Synthesis or Composition Decomposition
Single Displacement (Replacement)
Double Displacement (Replacement)
Combustion
Acid Base

4. Composition (Synthesis)
Two or more reactants combine to form a new product
A + B  AB
Example: Rust formation:
Fe(s) + O2(g)  Fe2O3

5. Decomposition
Compounds are broken down into two or more smaller compounds
AB  A + B
SiCl4  Si + Cl2

6. Single Displacement One element replaces another in a compound
AX + B  BX + A
Ca + HCl  CaCl2 + H2

7. Double Displacement Ions switch places; two elements switch places
AB + CD  AD + CB
AgNO3 + NaCl 
AgCl + NaNO3

8. Combustion
Carbon compound combines with oxygen to release carbon dioxide and water and energy
Carbon cmpd + O2 
CO H2O + energy!
C2H6 + O2  CO2 + H2O

9. Acid Base Reactions
The reactants will always be an acid and a base producing 2 specific products; Water and a Salt.
Acids always start with an H-
Bases always end in an –OH
Water is H2O
HCl + NaOH  H2O + NaCl

10. Predicting Products Identify the type of reaction
Use the general formula and label the parts of the equation
Predict the products using the general equation

11. Energy in Reactions
When reactions take place, chemical bonds are broken and new ones are formed
Breaking bonds require energy
New bonds forming release energy