When iodine reacts with bromine, a compound forms.
The percentage composition by mass of this compound is:
I=34.6%Br=65.4% \text{I} = 34.6\% \quad \text{Br} = 65.4\% I=34.6%Br=65.4%Show, by calculation, that the empirical formula of this compound is IBr3\text{IBr}_3IBr3.
The molecular formula of this compound is I2Br6\text{I}_2\text{Br}_6I2Br6. I2Br6\text{I}_2\text{Br}_6I2Br6 is a dark red crystalline solid at room temperature and forms a liquid when heated. A dynamic equilibrium exists in this liquid, represented by this equation:
I2Br6(l)⇌IBr2+(l)+IBr4−(l) \text{I}_2\text{Br}_6(\text{l}) \rightleftharpoons \text{IBr}_2^+(\text{l}) + \text{IBr}_4^-(\text{l}) I2Br6(l)⇌IBr2+(l)+IBr4−(l)(i) When a reaction is in dynamic equilibrium, the forward and backward reactions occur at the same time. State two other features of a reaction that is in dynamic equilibrium.
Suggest why liquid I2Br6\text{I}_2\text{Br}_6I2Br6 conducts electricity, but solid I2Br6\text{I}_2\text{Br}_6I2Br6 does not.
28 exam-style questions on Edexcel IGCSE Chemistry Reversible reactions and equilibria. Each one has a worked solution and a mark scheme showing where the marks go.