Types of Chemical Reactions

Audrey Bowling

Synthesis

Definition: reaction in which two or more substances react to form a single substance.


Equation: 2Na + Cl2 ----> 2NaCl


Ex: hydrogen and oxygen react to make water.

Decomposition

Definition: reaction in which a compound is broken down into two or more substances.


Equation: 2H2O ----> 2H2 + O2


Ex: When electricity passes through water and turns into hydrogen.

Single Replacement

Definition: reaction in which one substance is traded for another substance.


Equation: Cu + 2AgNO3 ---> 2Ag + Cu(NO3)2


Ex: Copper replaces silver in silver nitrate to create copper nitrate.

Double Replacement

Definition: Two different compounds exchange positive ions and form two new compounds.


Equation: Pb(NO3)2 + 2KI ---> PbI2 + 2KNO3


Ex: When Potassium Iodide solution is poured into a Lead Nitrate solution.

Combustion

Definition: Reaction in which a substance reacts with oxygen and creates heat or light.


Equation: CH4 + 2O2 ---> CO2 + 2H2O


Ex: When methane burns in an unlimited supply of oxygen.