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A Magnesium ribbon was cleaned with steel wool and used in the following set up. Wet sand was heated before Magnesium ribbon.

  1. Explain the following:
    • Sand was heated first before heating Magnesium ribbon
    • Magnesium ribbon was cleaned with steel wool 
  2. Name gas R
  3. Write an equation for the reaction taking place in the combustion tube
  4. Name the method used to collect gas R

1 Answer

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    • to generate steam for – driving air from apparatus; react with Magnesium
    • Remove layer of Magnesium oxide to allow Magnesium to combine with steam
  2. Hydrogen
  3. Mg(s) + H2O(g)→MgO(s) + H2(g)
  4. Over water method 
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