Reversible reaction: thermal decomposition of NH4Cl

• What is the name of the symbol NH4Cl?


  Ammonium chloride
• What happens to ammonium chloride when it is heated?


  It decomposes into ammonia gas and hydrogen chloride gas
• What is the physical state of ammonium chloride?


  It is a white solid
• What occurs under cool conditions after heating ammonium chloride?


  Ammonia and hydrogen chloride react to reform ammonium chloride
• What type of reaction is the forward reaction of ammonium chloride decomposition?


  It is endothermic
• What type of reaction is the reverse reaction of ammonium chloride decomposition?


  It is exothermic
• What are the products of the thermal decomposition of ammonium chloride?


  • Ammonia gas (NH₃)
  • Hydrogen chloride gas (HCl)
• Describe the reversible reaction involving ammonium chloride.


  • Heating ammonium chloride leads to decomposition into NH₃ and HCl (endothermic).
  • Cooling allows NH₃ and HCl to react and reform ammonium chloride (exothermic).
• What reforms?

  NH4Cl

  
• What decomposes?

  Ammonium chloride

  
• What type of temperature is this part of the test tube like ?

  Cooler

  
• What does ammonium chloride decompose into?

  NH3 and HCl

  
• What is this mixture?

  HCl and NH3

  
• What is happening? (1)

  Bunsen burner is heating the solution up

  
• What is happening? (2)

  The ammonium chloride is heated up

  
• What is happening? (3)

  The ammonium chloride is cooled down