8.4 REACTIONS OF METALS AND WATER

• Reactions of Sodium and Potassium With Water


  some metals are too reactive to test in water eg. sodium and potassium. (which are soft unlike most metals)

  they must be stored under oil to prevent from reacting with the water vapour in the air.

  metal + water -> metal hydroxide + hydrogen
• Reactions of Other Metals With Water


  other metals react less vigorously eg. calcium and magnesium.
• Other Metals


  some metals that don't react with water may react with steam, eg. magnesium.

  
  

  magnesium + water (g) -> magnesium oxide + hydrogen

  (g) indicates its in a form of gas

  
  

  other metals eg. gold do not react with water at all.
• Reactivity


  how reactive something is.
• Experimenting the Reactions of Metals with Water


  A piece of the metal is placed at the bottom of a beaker and covered in water. A filter funnel has been placed upside down over the metal. The gas given off is collected in a test tube by the displacement of water.
• Zinc + Nitrate


  -> zinc nitrate + ammonium nitrate