Summary
Summary Topic 3 - inorganic - group 7
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A summary of topic 15 from AQA A Level Chemistry Specification
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7Group
-
, halogens
PROPERTIES DISPLACEMENT BLEACH
REA / ON
> Fluorine / F.) chlorine with cold, dilute
gas
pale yellow They gain sodium
hydroxide solution
-
an
-
gas electron so are an
-
15252ps oxidising agent . 2NaOH+Ch→NaC1O+NaCHHz0
They get less oxidation
state
0 +1 -1
Chlorine (Ch)
> reactive as
they go
-
down the The Bleach is the sodium
green group .
chlorate (1) solution
-
gas
15252ps 353ps Chlorine water
-
+ KBR -
solution
orange CHLORINE AND WATER
> Bromine 43rd formed
red brown KI Brown solution
-
-
+ -
liquid formed Clitthi≥ 21-1++0-+40
-
-
-
15252ps-353ps oxidation
0 +1 -1
3d 454ps
"
Bromine water
state
+ KI -
Brown solution Different reaction in the sun
> Iodine ( Iz) formed
-
Ch 1-1-10 21-1++20-+40
-
grey
solid Iodine solution
,
15252ps€353M
WATER TREATMENT
reaction (brown]
-
no
3d '°454p64d
"
555ps CHLORINE
chlorate (1) ions kill
Boiling Points Ch+2kBr→2kCHBrz bacteria But chlorine
. is
Clz+2Br-→ 24 + Brz toxic
-
.
Increase down
As It is
the
group . van BROMINE harmful if breathed in
der Waals and liquid burn
forces can .
Bn+2kl→2KBr+k
get and
stronger
Ar
as
Brat 21=>212-+12 In the UK it used to
size gets is
bigger Changes
state too
.
IODINE
treat water .
as
gastro
solid .
Iodine is unreactive Water contains lots of
Electronegativity so won't displace
either halide
organic
as
products
dead rats
such
"• down
the
group .
As This means its important
smaller atoms There are other to treat it so the risks
the
are more interesting halide
outweigh benefits .
electronegative reactions
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