A. synthesis reaction

Synthesis reaction: A reaction in which two or more reactants combine to produce a single product; think about what it means to synthesize – to combine
Decomposition reaction: A reaction that produces two or more products from a single reactant; breaking something down
2 NaOH –> Na2O + H2O
Combustion reaction: A reaction in which an atom or molecule reacts with oxygen to produce energy in the form of light & heat; there is always H2O as a byproduct
CH4 + 2O2 –> CO2 + 2H2O + Energy
Single displacement reaction: A reaction where one atom or molecule that is replaced by another element in a compound
2 HCl + Zn –> ZnCl2 + H2