1. The Halogens

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

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

4. Uses of the Halogens Fluorine Chlorine Bromine Iodine Disinfectant
Halogen lamps
X ray diagnosis
Salt additive
Thyroid treatment
Cancer treatment
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

5. 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 NaCl
Complete these equations
Lithium + Bromine
Potassium + Iodine
Lithium Bromide
Potassium Iodide
Follow the pattern to write the balanced chemical equations

6. 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 Cl HCl
Complete these equations
Hydrogen + Bromine
Hydrogen + Iodine
Hydrogen Bromide
Hydrogen Iodide
Follow the pattern to write the balanced chemical equations

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

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