Group 1 - The alkali Metals

  • Created by: HRichmond
  • Created on: 01-03-18 20:20
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  • Group 1 - The Alkali Metals
    • These are called Lithium, Sodium, and Potassium
    • They all react vigorously with air and water
    • The reactivity of the alkali metals increases down the group
    • They must be stored under oil to keep air and water
    • They produce an alkaline, metal hydroxide and hydrogen gas
    • Metal + Water = Metal hydroxide + hydrogen
    • Equation for the reaction of sodium and water:              Sodium + Water  = Sodium hydroxide + hydrogen
    • The word equation for Sodium and Water:             2Na + 2H20 + H2
    • Lithium is the least reactive and potassium is the most reactive of the three
    • The reaction of potassium with water gives off a lilac flame
    • Group 1 elements with the reaction of water
      • Lithium - Fizzes steadily, gradually disappears
      • Sodium - Fizzes rapidly, melts into a ball and disappears quickly
      • Potassium - Ignites with sparks and a lilac flame, disappears very quickly
      • Rubidium - Explodes with sparks
      • Caesium - Violent explosion due to rapid production of heat and hydrogen
    • The reactivity of group 1 becomes more reactive as you go down the group
    • The melting points of group 1 elements
      • Lithium - 181 degrees
      • Sodium - 98 degrees
      • Potassium - 63 degrees
      • Caesium - 29 degrees
    • The flame test is to test a compound to detect the presence of an alkali metal ion
      • The flame colour indicates which alkali metal ion is present in the compound
      • A cleaned, moistened flame test wire is dipped into a solid sample of the compound and then put into a blue Bunsen flame
      • Flame colour and the alkali metal ion they represent:      Red - Lithium Orange - Sodium Lilac- Potassium


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