When iodine reacts with chlorine, a compound forms.
The percentage composition by mass of this compound is:
I=54.4%Cl=45.6% \text{I} = 54.4\% \quad \text{Cl} = 45.6\% I=54.4%Cl=45.6%Show, by calculation, that the empirical formula of this compound is ICl3\text{ICl}_3ICl3.
The molecular formula of this compound is I2Cl6\text{I}_2\text{Cl}_6I2Cl6. I2Cl6\text{I}_2\text{Cl}_6I2Cl6 is a bright yellow crystalline solid at room temperature and forms a liquid when heated. A dynamic equilibrium exists in this liquid, represented by this equation:
I2Cl6(l)⇌ICl2+(l)+ICl4−(l) \text{I}_2\text{Cl}_6(\text{l}) \rightleftharpoons \text{ICl}_2^+(\text{l}) + \text{ICl}_4^-(\text{l}) I2Cl6(l)⇌ICl2+(l)+ICl4−(l)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 I2Cl6\text{I}_2\text{Cl}_6I2Cl6 conducts electricity, but solid I2Cl6\text{I}_2\text{Cl}_6I2Cl6 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.