period 3 oxides

• reaction of Na with water

  2Na + 2H20 → 2NaOH + H2

  • vigorous reaction
  • effervescence/fizzing
• reaction of Mg with cold water

  Mg + 2H2O → Mg(OH)2 + H2

  • slow reaction
  • Mg(OH)2 - sparingly soluble
• reaction of Mg with steam (hot water)

  Mg + H20 → MgO + H2

  • faster reaction
  • produces MgO - burns with white flame
• sodium +oxygen:

  4Na (s) +O2(g) → 2Na2O(s)
• reaction of sodium with oxygen

  • sodium burns with a yellow flame
  • produces a white solid
• magnesium + oxygen

  2Mg (s) +O2 (g) → 2MgO (s)
• reactions of Mg - P with oxygen

  • burns with a white flame
  • produces a white powder/solid