types of chemical reactions

• Synthesis/Combination reaction


  Two or more reactants and only one product
• Combination reaction


  Reactants combine to form a product
• General form of combination reaction

  A + B → AB
• Combination reaction examples


  • Sodium + Chlorine gas → Sodium chloride

  Ammonia + Hydrochloric acid → Ammonium chloride
• Decomposition reaction


  A single compound breaks down into two or more simpler products
• Decomposition reaction


  One reactant decomposes into two or more products
• General form of decomposition reaction

  AB → A + B
• Decomposition reaction examples


  • Hydrogen peroxide → Hydrogen + Oxygen

  Zinc carbonate → Zinc oxide + Carbon dioxide
• Single displacement/replacement reaction


  One element replaces another element in a compound
• Single displacement/replacement reaction


  Compound + Element → New compound + Element
• General form of single displacement/replacement reaction

  AB + X → AX + B
• Single displacement/replacement reaction examples

  • 2 Hydrochloric acid + Zinc → Zinc chloride + Hydrogen

  Bromine + Potassium iodide → Potassium bromide + Iodine
• Double displacement/replacement reaction

  Exchanging of ions to form new compounds
• Double displacement/replacement reaction

  Compound A + Compound B → Compound C + Compound D
• General form of double displacement/replacement reaction

  AB + XY → AX + BY
• Double displacement/replacement reaction examples

  • Barium chloride + Sodium sulfate → Barium sulfate + Sodium chloride

  Potassium bromide + Silver nitrate → Potassium nitrate + Silver bromide
• Practice activity: Classify the following reactions