b)
A teacher uses displacement reactions to demonstrate the reactivities of some halogens.
She adds solutions of chlorine, bromine and iodine separately to three different sodium halide solutions.
The table shows some of the teacher’s results.
|
sodium chloride |
sodium bromide |
sodium iodide |
chlorine solution |
not done |
solution turns orange |
|
bromine solution |
solution stays orange |
not done |
solution turns brown |
iodine solution |
|
solution stays brown |
not done |
A change in colour of the solution indicates that a reaction has occurred.
i)
Complete the table by predicting the missing results.
[2]
ii)
State why the teacher does not add bromine solution to sodium bromide solution.
[1]
iii)
The word equation for the reaction of bromine with sodium iodide is
bromine + sodium iodide → iodine + sodium bromide
Write a chemical equation for this reaction.
[1]