GROUP 2

    Cards (17)

    • what is the trend of the solubility of Group 2 Hydroxides?
      solubility increases down the group
    • what is the trend of the solubility of Group 2 Sulphates?
      solubility decreases down the group
    • Soluble salts
      • Sr(OH)₂ + Ba(OH)₂
      • K₂CO₃ + NaCO₃
      • most SO₄²⁻
      • most Cl⁻ Br⁻ I⁻
      • All NO₃
    • Insoluble Salts
      • most OH⁻
      • most CO32-
      • SrSO4 + BaSO4
      • AgCl AgBr AgI
    • Why does Mg react with steam not water?

      The reaction with water is really so slow so we assume there was no reaction.
    • Equation for group 2 reacting with water:
      M(s) + 2H₂O(l) → M(OH)2(?) + H2(g)
    • What does the reaction with water depend on?
      • how easily the outer 2 electrons are removed from the metal to form a 2+ ion
      • how soluble the hydroxide is
      • Mg is an exception
    • Equation for Mg reacting with steam:
      Mg(s) + H2O(g) → MgO(s) + H2(g)
    • What observations are made when reacting Mg with steam?
      a white bright light and white powder
    • What is Mg(OH)2 used in?
      laxatives and antacids (neutralise excess acid in stomach)
    • What is Barium Sulphate used as in medicine?
      a contrast agent to see internal organs more clearly in a CT scan or X-ray examination
    • What is Calcium Sulphate used in?
      used in agriculture to neutralise acid
    • What gases are used to remove Sulphur dioxide from flue gases?
      Calcium oxide or calcium carbonate.
    • Equations for removing Sulphur dioxide using Calcium Oxide
      CaO + SO2 → CaSO3
      CaSO3 + 1/2O2 → CaSO4
    • removing Sulphur dioxide using Calcium Carbonate
      CaCO3 + SO2 → CaSO3 + CO2
      CaSO3 + 1/2O2 → CaSO4
    • What are acidified bases used for?
      To test for sulphate ions
    • Equation for extracting Titanium
      TiCl4(g) + 2Mg(l) → Ti(s) + 2MgCl2(l)