F332 Halogens

In the specification it is also important that you can 

-explain and compare the relative reactivity of the halogens in terms of their oxidising ability

-describe and write half-equations for the redox changes which take place:

-when Cl, Br, and I react with the other halide ions

-the change at the electrodes on electrolysis of aqueous halide solutions

?
Down the group halogens become
less reactive
1 of 20
Halogen atoms are oxidising agents because...
they gain one electron in their outershell and are reduced so they oxidise other substances
2 of 20
The pattern in reactivity is due to
an increase in atomic size and sheilding
3 of 20
The sheilding makes it...
harder for larger atoms to attract the electron needed to form an ion
4 of 20
Hence if they are less reactive down the group they are...
less oxidizing
5 of 20
A way to see the strength of the halogens is through...
their displacement reactions
6 of 20
Due to oxidising strength which halogen can displace the other....
bromine can displace ioding
7 of 20
An organic solvent will...
make the changes easier to see as it dissolves in the solvent
8 of 20
A violet pink colour in the hexane layer shows the presence of
iodine
9 of 20
An orange/red colour shows the presence of
bromine
10 of 20
A very pale yellow/green colour shows the presence of
chlorine
11 of 20
A halogen will displace a halide if...
the halide is below it in the periodic table
12 of 20
Silver nitrate is used to
test for halides
13 of 20
In the test dilute nitric acid is used in order to...
remove ions that might interfere with the test
14 of 20
After adding silver nitrate (AgNO3 (aq))....
a precipitate is formed (formation of a solid) of the silver halide
15 of 20
The formula for this reaction is... (X is Cl, Br or I)
Ag+ (aq) + X- (aq) -> AgX (s)
16 of 20
If the colour of the precipitate is white the halide is
Cl-
17 of 20
If the colour of the precipitate is cream the halide is
Br-
18 of 20
If the colour of the precipitate is yellow the halide is
I-
19 of 20
To double check you can add
ammonia solution NH3
20 of 20

Other cards in this set

Card 2

Front

Halogen atoms are oxidising agents because...

Back

they gain one electron in their outershell and are reduced so they oxidise other substances

Card 3

Front

The pattern in reactivity is due to

Back

Preview of the front of card 3

Card 4

Front

The sheilding makes it...

Back

Preview of the front of card 4

Card 5

Front

Hence if they are less reactive down the group they are...

Back

Preview of the front of card 5
View more cards

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