Chemical Reactions

• When the Hydrogen (H2) gas burns, it reacts with oxygen (O2) in the air to form water (H2O).
• Methane (CH4), the principal component of natural gas, burns in air to produce carbon dioxide gas (CO2) and water vapor (H2O)
• Combination


  A + B → AB
• Decomposition


  AB → A + B
• Single Replacement


  A + BC → AB + C

  A + BC → AC + B
• Double Replacement

  AB + CD → AD + BC
• Combustion

  Complete Combustion = CO2

  Incomplete Combustion = CO (toxic gas)