Fluorine displaces all other halogens. Chlorine displaces bromine from bromides and iodine from iodides. Br 2 Uses of the Halogens Chlorine in water is useful as a strong bleach as a sterilising agent in swimming pools and for water treatment. Large amounts of chlorine are used in the manufacture of insecticides. Iodine used to be a common antiseptic.
Modern antiseptics are more effective and less damaging to the skin.
The uses of halides required by exam boards varies. Hydrochloric Acid Hydrogen chloride is a covalent molecule. Hydrogen chloride in water becomes hydrochloric acid. Hydrochloric acid is completely ionised in water. The tutorial introduces the reactivity series by building on work from earlier tutorials.