Reactions of period 2 and 3 with oxygen

• What do elements in periods 2 and 3 react with to form oxides?

  Oxygen
• How do period 2 elements typically form oxides?

  By being burnt in pure oxygen
• What are the properties of some oxides formed by period 2 elements?

  • BeO: Solid, Giant Ionic Lattice, Alkaline
  • B₂O₃: Solid, Giant Ionic Lattice, Acidic
  • CO₂: Gas, Simple Molecular, Acidic
  • NO₂: Gas, Simple Molecular, Acidic
  • N₂O: Gas, Simple Molecular, Neutral
• What is the formula for the oxide formed by magnesium in period 3?

  MgO
• What are the properties of some oxides formed by period 3 elements?

  • Na₂O: Solid, Giant Ionic Lattice, Alkaline
  • MgO: Solid, Giant Ionic Lattice, Alkaline
  • Al₂O₃: Solid, Giant Ionic Lattice, Amphoteric
  • SiO₂: Solid, Giant Covalent Lattice, Neutral
  • P₄O₁₀: Solid, Simple Molecular, Acidic
  • SO₂: Gas, Simple Molecular, Acidic
  • Cl₂O₇: Gas, Simple Molecular, Acidic
• What happens when metal oxides dissolve in water?

  They form alkaline solutions
• What is the reaction of sodium oxide with water?

  Na₂O(s) + H₂O(l) → 2NaOH(aq)
• What do non-metal oxides form when they dissolve in water?

  Acidic solutions
• What is the reaction of sulfur dioxide with water?

  SO₂(g) + H₂O(l) → H₂SO₃(aq)
• What are the structural differences between metal and non-metal oxides?

  • Metal oxides:
  • Solid
  • High melting point
  • Giant ionic lattice structure
  • Non-metal oxides:
  • Gaseous
  • Low melting point
  • Simple molecular structures