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Group 7 – The Halogens

Group 7 – The Halogens. DECREASING REACTIVITY. INCREASING DENSITY. INCREASING MOLECULAR SIZE. Properties of the Halogens. Colour. State. Yellow. Gas. Green Orange Grey/black. Gas Liquid Solid. Black. Solid. Uses of the Halogens. Fluorine. Chlorine. Bromine. Iodine.

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Group 7 – The Halogens

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  1. Group 7 – The Halogens

  2. DECREASING REACTIVITY INCREASING DENSITY INCREASING MOLECULAR SIZE Properties of the Halogens Colour State Yellow Gas Green Orange Grey/black Gas Liquid Solid Black Solid

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

  4. ALKALI METAL + HALOGEN METAL HALIDE Sodium + Chlorine Sodium Chloride 2Na + Cl2 2NaCl Complete these equations Lithium + Bromine Potassium + Iodine Reactions of the Halogens (1) All of the halogens will react with Alkali metals to produce ioniccompounds Lithium Bromide Potassium Iodide Follow the pattern to write the balanced chemical equations

  5. HYDROGEN + HALOGEN HYDROGEN HALIDE Hydrogen + Chlorine Hydrogen Chloride H2 + Cl2 2HCl Complete these equations Hydrogen + Bromine Hydrogen + Iodine Reactions of the Halogens (2) All of the halogens will react with Hydrogen to produce gasas Hydrogen Bromide Hydrogen Iodide Follow the pattern to write the balanced chemical equations

  6. WATER + HALOGEN ACID 1 + ACID 2 Water + Chlorine Hydrochloric + Hydrochlorus Acid Acid H2O + Cl2 HCl + HOCl Reactions of the Halogens (3) All of the halogens will react with water to produce 2 acids This also happens with Bromine and Iodine and the acids formed are much stronger!

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