–(iii) Complete the equation for the reaction.
•AlCl3
+ .......................
→ ...................................... +
–
– ........................................ [2]
7. N01/3/4. (a) Zinc is
made by reducing zinc oxide. In 1695 Homberg obtained zinc from
calamine, zinc carbonate. At present zinc is extracted from the
ore, zinc blende.
–(i) Suggest a way of changing calamine into zinc oxide. [1]
–
–(b) Zinc oxide is used to make aqueous
zinc chloride. This can be used to preserve wood. Describe how
this solution could be made. [3]