Question

(a) Copper is a metal in high demand that is now often recycled.
      To recycle copper, it must be melted down into a liquid.
      (i) Suggest one reason other than cost why copper and other metals are recycled.
     (ii) Describe two differences between the arrangement and motion of atoms in molten
            copper and the arrangement and motion of atoms in solid copper.

(b) A metal coin is covered with a layer of copper by electroplating.
       (i) The coin is used as one of the electrodes.
             State for which electrode the coin is used.
       (ii) Suggest a suitable solution to be used as the electrolyte for electroplating the coin.
      (iii) Electroplating uses the process of electrolysis; a definition is provided.
             Electrolysis is the breakdown of a covalent compound when solid or in aqueous solution by the passage of electricity.
             This definition of electrolysis is not correct.
             Circle the two words in the definition that are not correct.