Halogens

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  • Created by: xxSonia
  • Created on: 06-05-15 23:45

Properties of halogens

Halogen

formula

Colour

Physical state

Fluorine

F2

Pale yellow

Gas

Chlorine

Cl2

Green

Gas

Bromine

Br2

Red-brown

Liquid

Iodine

I2

Grey

Solid

Boiling point - The boiling point increses as you gp down groop, this is because of increasing vander vaals forces as the relative mass of atoms icreases. this is seen in the trend of physical state of atoms.

Electronegativity - larger atoms share electrons less than smaller ones so electronegativity decreases.

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Displacement Reactions

a halogen will displace a halide from solution if it is below it in the periodic table. 

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Chlorine

Add chlorine gas with sodium hydoxide at room temperature you get sodium chlorate solution. NaClO(aq) also known as common household bleach. Some of the chlorine is oxided and reduced. This is known as disproportionation reaction.

Chlorine and Water

Another dispropportionation reaction

End up with a mixture of hydrochloric acide and chloric(I) acid 

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Water Treatment

Chlorate(I) ions kills bacteria, therefore makes water safe to drink 

kills disease causing micro organisms 

prevents growth of algae

removes dis colouration caused by organic compunds

However harmful when breathed in. 

irritates the respiratory system

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