3.1.3 - The Halogens Flashcards
What is the colour and state of fluorine?
Pale yellow gas.
Colour and state of chlorine?
Green gas
Colour and state of bromine?
Red/brown liquid
Colour and state of iodine?
Grey solid.
What do Halogens exist as?
Diatomic molecules.
What happens to their boiling and melting points down the group?
They increase due to increased strength of London forces as the size and relative mass of the atoms increase.
Are halogens oxidised or reduced?
Reduces therefore oxidising agents.
What do halogen form when they react?
1- ions.
Why are atoms less reactive as you go down the group?
Atomic radii increases which means outer electrons are more shielded from the attraction of the positive nuclei, as there are more inner electrons. This makes it harder for larger atoms to attract the electron needed to form an ion……
What happens during a displacement reaction?
There is a colour change.
Example of organic solvent?
Hexane
How can you see a displacement reaction?
Shake the mixture with an organic solvent. The halogen present will dissolve readily in the organic solvent which settles out as a distinct layer above the aqueous solution.
What colour is chlorine water?
Colourless.
What colour is bromine water?
Yellow
What colour is iodine solution?
Orange / brown.
