If bromine water is added to potassium iodide solution, a reaction occurs.
bromine+potassium iodide→potassium bromide+iodine \text{bromine} + \text{potassium iodide} \rightarrow \text{potassium bromide} + \text{iodine} bromine+potassium iodide→potassium bromide+iodineGive one reason why this reaction occurs.
106 exam-style questions on Edexcel GCSE Chemistry 7.2 Group 7, covering 7.2.1 Physical properties of the halogens, 7.2.2 Reactions of the halogens, 7.2.3 Relative reactivity and displacement reactions of the halogens, and 7.2.4 Halogen displacement as a redox reaction. Each one has a worked solution and a mark scheme showing where the marks go.