Group 2

    Cards (19)

    • Bonding in group 2
      Metallic
    • How does Metallic bonding arise in G2 metals?
      strong attraction between positive ions and delocalised electrons
    • Why does NaCl have a high melting point?
      Ionic lattice, strong electrostatic attraction between oppositely charged ions Na+ and Cl-
    • Atomic radius down G2
      Increases, atom gets larger, more shells and shielding
    • MP down G2
      Decreases down the group, atom gets larger, more shielding so weaker attraction between nucleus and delocalised electrons
    • IE down G2
      Decreases down the group, ions get bigger, more shielding, weaker attraction between lost electrons
    • Solubility of hydroxides in G2
      increases down the group
    • What colour are ppt of G2 hydroxides?
      white
    • What is magnesium hydroxide used for?
      antacids
    • What is Calcium hydroxides used for?
      neutralising acidic soil
    • How would Mg react if there was a coating of MgO on its surface?
      react at different rates in a given tome
    • Solubility of G2 sulphates
      Solubility decreases down the group
    • What is Barium sulphate used for?
      Barium meals
    • How can BaSO4 be ingested and is not toxic?
      insoluble
    • Reagent to test for sulphate ions in G2
      BaCl2
    • Why can't H2SO4 be used to test for sulphates?
      contain sulphide ions, would react to give white ppt
    • Reaction of Mg vs Ca with H2SO
      MgSO4 fastest because more soluble in sulphuric acid. CaSO4 slows down because CaSO4 forms on the surface of Ca, coating prevent contact with acid
    • How to measure the solubility of a substance in solution?
      -evaporate filtrate till dryness
      -weigh the residue
      -take known volume of solution
    • Barium hydroxide dissolves easily in water, makes water very alkali because of hydroxide present
      Ba(OH)2 + aq -> Ba2+ + 2OH-
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