1. Group 7 – The Halogens F Cl Br I At

2. Properties of the Halogens F Cl Br I At Colour Green Orange Grey/black State Gas Liquid Solid Yellow BlackSolid Gas INCREASING MOLECULAR SIZE INCREASING DENSITY DECREASING REACTIVITY

3. Uses of the Halogens FluorineIodineBromineChlorine Toothpaste Water treatment Extraction of Aluminium Non stick coatings Enrichment of Uranium Water disinfection Hydrochloric acid Plastics Bleaches Photographic film Tear gas Flame retardants Pharmaceuticals Disinfectant Halogen lamps X ray diagnosis Salt additive Thyroid treatment Cancer treatment

4. Reactions of the Halogens (1) All of the halogens will react with Alkali metals to produce ionic compounds ALKALI METAL + HALOGEN METAL HALIDE Sodium + Chlorine Sodium Chloride 2Na + Cl 2 2NaCl Complete these equations Lithium + Bromine Potassium + Iodine Lithium Bromide Potassium Iodide Follow the pattern to write the balanced chemical equations

5. Reactions of the Halogens (2) All of the halogens will react with Hydrogen to produce gasas HYDROGEN + HALOGEN HYDROGEN HALIDE Hydrogen + Chlorine Hydrogen Chloride H 2 + Cl 2 2HCl Complete these equations Hydrogen + Bromine Hydrogen + Iodine Hydrogen Bromide Hydrogen Iodide Follow the pattern to write the balanced chemical equations

6. Reactions of the Halogens (3) All of the halogens will react with water to produce 2 acids WATER + HALOGEN ACID 1 + ACID 2 Water + Chlorine Hydrochloric + Hydrochlorus Acid H 2 O + Cl 2 HCl + HOCl This also happens with Bromine and Iodine and the acids formed are much stronger!

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