Types of Chemical Reactions

SYNTHESIS Reaction 3H2 + N2  2NH3 2 or more reactants combine to build a single product 3H2 + N2  2NH3

2H2O  2H2 + O2 DECOMPOSITION Rxn A compound is broken down into 2 or more simpler substances 2H2O  2H2 + O2

SINGLE REPLACEMENT Rxn One of the reactants is a single element. It becomes part of a compound as a product. Mg + CaBr2  Ca + MgBr2

DOUBLE REPLACEMENT LiCl + KBr  LiBr + KCl TWO elements switch places during the process of the reaction. LiCl + KBr  LiBr + KCl

Combustion Oxygen is always a reactant CO2 and H2O are always products _______ + O2  CO2 + H2O

Practice 2Al + 3CuSO4  Al2(SO4)3 + 3Cu C12H22O11  11H2O + 12C KCl + AgNO3  KNO3 + AgCl CH4 + 2O2  CO2 + 2H2O

Practice 2Al + 3CuSO4  Al2(SO4)3 + 3Cu Single Replacement Reaction C12H22O11  11H2O + 12C decomposition KCl + AgNO3  KNO3 + AgCl Double replacement reaction CH4 + 2O2  CO2 + 2H2O combustion

The LOCOM states Balancing Equations atoms are not created or destroyed during a chemical reaction atoms are rearranged to form new substances

# atoms on reactant = # atoms on products 

Practice Balancing Mg + Al(SO4)3  MgSO4 + Al HINT if the SAME polyatomic ion is present on both sides of the equation, count it together

ANSWER 3Mg + Al(SO4)3  3MgSO4 + Al

Step 3 take inventory of atoms add atoms to the side that need them & immediately recount your inventory Step 3 repeat Steps 1 & 2 until the equation is balanced with reduced coefficients

Practice CH4 + O2  CO2 + H2O ANSWER CH4 + 2O2  CO2 + 2H2O

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