Group 7 the halogens

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by Gmalin97
Last updated 6 years ago

Discipline:
Science
Subject:
Chemistry

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Group 7 the halogens

1) As you move down the group atomic radius increases meaning there is a larger "surface area" for the vdW forces to occur between, the more vdw forces there are the stronger the bonds, leading to a higher boiling point... therefore more intermolecular bonds between each molecule.2) Halogens are strong oxidising agents - oxidising power of a halogen is a measure of the strength with which a halogen atom is able to attract and hold an electron to form a halide ion.It is a redox reaction in which each halogen atom gains one electron into a p sub shell forming a negative halide ion.It is harder for Group 7 elements to form negative ions as you go down the group because reactivity decreases leading too.... - atomic radius increasing- electron shielding increasing- increased nuclear charge is outweighed by electron shielding.3)Halogens are elements in group 7 of the periodic table, their ions are called halide ions.You can test to see if a solution contains chloride, bromide or iodide ions by using silver nitrate. If silver nitrate solution is added to a sample of water containing halide ions the silver halide is precipitated. This is because the silver halides are all insoluble in water.

1) Trends in boiling points using van der Waals (vdW)2)Trend in reactivity down the Group 7 elements 3) Precipitation reactions and there uses

Ionic equations for prectipitation reactions

Melting and Boiling points of Halogens

Group 7

Explained...

Group 7 aka The Halogens

Chemical Test for Halides

- Dissolve the unknown halide substane in water- Add an aqueous solution of silver Nitrate AgNo3.- Silver ions from the silver ntirate react with halide ions present forming a silver halide precipitate.- the silver halide precipitate is coloured - this colour tells us which halide is present.


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