Module 3

• Group 2 with oxygen

  2Ca + O2 = 2CaO
• Group 2 with Water

  Ca + 2H2O = Ca(OH)2 +H2
• Colour of Cl2 in water

  Pale green
• Colour of Cl2 in cyclohexane


  Pale green
• Colour of Br2 in water

  Orange
• Colour of Br2 in cyclohexane

  Orange
• Colour of I2 in water

  Brown
• Colour of I2 in cyclohexane

  Violet
• Colour of Cl in silver nitrate

  White precipitate
• Colour of Br in silver nitrate

  Cream precipitate
• Colour of I in silver nitrate

  Yellow precipitate
• Observation of Cl in NH3

  Dissolves in dilute NH3
• Observation of Br in NH3

  Dissolves in concentrated NH3
• Observations of I in NH3

  Does not dissolve in concentrated NH3