(a(i))[1]
Describe how zinc sulfide is changed into zinc oxide in this industrial process.
(a(ii))[2]
Write down the chemical equation for this reaction.
(b(i))[1]
Name the substance that is added to the furnace so that zinc oxide is reduced.
(b(ii))[2]
Describe how the pure zinc leaves the furnace and is collected.
(c(i–iii))[6]
(i) Write the ionic half-equation for the reaction occurring at the zinc rod. (ii) Write the ionic half-equation for the reaction occurring at the copper rod. (iii) The copper rod was changed to an iron rod. Suggest the change, if any, in the brightness of the bulb and explain your answer.