Types of Reactions

Types of Reactions

Synthesis (or Combination) Reaction

• Two or more reactants (simple) to one product (complex)
• General Equation: A + X --> AX
• eg: 3H₂(g) + N₂(g) --> 2NH₃

Decomposition Reaction

• One reactant (complex) to two or more products (simple)
• General Equation: AX --> A + X
• eg: PbCO₃(s) --> PbO(s) + CO₂(g)

Single-Replacement (Exchange) Reaction

• One element replaces another of the same type charge
• General Equation: A⁺ + B⁺X⁻ --> AX + B 
• eg: Cl₂(g) + KBr(aq) --> KCl(aq) + Br₂(g)

Double Replacement (Exchange) Reaction

• Exchange cations and anions
• An acid and base react to form water
• General Equation: A⁺X⁻ + B⁺Y⁻ --> AY + BX
• eg: 2AgNO₃(aq) + MgCl₂(aq) --> 2AgCl(s) + Mg(NO₃)₂(aq)

Combustion Reaction

• Substances combine with O₂-- must release heat or light
• Balance in order of C, H, then O
• General Equation: X + O₂--> CO₂ + H₂O
• eg: 2C₅H₁₀(g) +15O₂(g) → 10CO₂(g) + 10 H₂O(l)