Types of Chemical Reactions

121.Synthesis when two or more elements combine to form a compound. A + B → AB Example: 8 Fe + S8 → 8 FeS

122. Decomposition a compound breaks down to make simpler ones. AB → A + B Example: 2 H2O → 2 H2 + O2

123. Single replacement An element trades places with another element in a compound. A + BC → AC + B Example: Mg +2 HCl→ MgCl2 + H2

124. Double replacement two elements switch places, forming two new compounds. AB + CD → AD + CB Example: PbBr2 + 2 KCl → PbCl2 + 2 KBr

125. Combustion when oxygen combines with another compound to form water and carbon dioxide. These reactions require oxygen. CH + O2 → CO2 + H2O Example: C10H8 + 12 O2 → 10 CO2 + 4 H2O

126. Neutralization or acid/base when an acid and base react with each other causing the formation of water. H A + B OH ---> H2O + BA Example: HBr + NaOH ---> NaBr + H2O

Identify the following chemical equations by type. C4H8 + 6O2 ---> 4CO2 + 4H2O _______ HCl + NaOH ---> H2O + NaCl _______ 2KNO3 ---> 2KNO2 + O2 _______ AgNO3 + NaCl ---> NaNO3 + AgCl _______ 2Mg + O2 ---> 2MgO _______ MgCO3 ---> MgO + CO2 _______ Cl2 + 2KBr ---> 2KCl + Br2 _______ 2Ag + S ---> Ag2S _______ Double replacement Combustion Single replacement Synthesis Neutralization Decomposition