1. Chemical Reactions

2. What is a Chemical Reaction?
A chemical reaction is the process by which one or more substances are changed into one or more different substances.

3. Indications of a chemical reaction:
Production of heat or light
Production of a gas
Formation of a precipitate
A precipitate is a solid that forms when two or more liquids are combined.
Unexpected Color Change

4. Types of Chemical Reactions:
Synthesis
Decomposition
Single Replacement
Double Replacement
Combustion
Oxidation and Reduction
Neutralization of Acids and Bases

5. Type of Reaction Definition
 Equation
Synthesis
Decomposition
Single Replacement
Double Replacement
Two or more elements or compounds combine to make a more complex substance
A + B → AB
AB → A + B
Compounds break down
into simpler substances
Occurs when one element replaces another one in a compound
AB + C → AC + B
Occurs when different atoms in two different compounds trade places
AB + CD → AD + CB
A = Red B = Blue C = Green D = Yellow

6. Combustion reactions
Combustion –when oxygen combines with a hydrocarbon to form water and carbon dioxide. This will produce heat and light.
ALWAYS includes O2 as a reactant
ALWAYS has CO2 and as H2O
products.
Ex: Combustion of napthalene:
C10H O2 ---> 10 CO2 + 4 H2O