Group 2 and 7

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  • Topic 4
    • Group 2
      • Physical properties
        • Atomic radius increases going down
        • Ionic radius increases going down
        • Melting points decrease going down
      • Chemical properties
        • Reactivity increases going down
        • ionisation energy decreases going down
      • Reaction with oxygen
        • Increasing vigour down the group
        • oxygen is reduced and the metal is oxidized
      • Reaction with water
        • Increase vigour going down the group
        • Magnesium can only react with water if it is steam
        • Metal hydroxide + hydrogen gas
      • Reaction with Dilute acid
        • Increase vigour going down
        • A salt + hydrogen gas formed
      • Group 2 oxides
        • With water to make metal hydroxide
        • Charge density decreases
        • Increase in solubility
      • Group 2 Carbonate
        • Insoluble in water
        • Thermal decompose to make metal oxide and carbon dioxide
      • Group 2 sulphates
        • White crystaline solid
        • Solubility in water decreases going down
    • Group 7
      • Physical properties
        • Boiling points increase going down
        • Electronegativity decreases going down
        • Atomic size increases going down
        • Ionic size increases going down
        • Oxidising power decreases going down
        • Reducing power increases going down
      • Halogens and water
        • Acid + halogen oxide
      • Halogen + sodium hydroxide
        • Sodium halogen + sodium halogen oxide + water
      • Test for halides
        • Add silver nitrate
          • Chloride = white
          • Bromide = cream
          • Iodide = yellow
        • Add dilute ammonia
          • Chloride is soluble by iodide and bromide are not
        • Add strong ammonia
          • Chloride and Bromide is soluble but iodide isn't
      • Halogen with hydrogen
        • Boiling point decreases going down
        • Reducing ability increases going down

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