C3e Group 7 Element Answer

C3e Group 7 Element Answer Paper

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  • Created on: 04-05-12 07:19
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Item C3e:
The
G r
oup
7 El
ement
s
1. El
ement
s i
n gr
oup
7 ar
e cal
led
hal
ogens
2. The
element
s i
n t
his
gr
oup
have
7 el
ect
rons
on
thei
r
out
er
shel
ls
.
3. Fl
uor
ine,
C hl
ori
ne,
br
omi
ne
and
iodi
ne
are
all
e xampl
es
of
hal
ogens
.
4. St
ate t
he uses
of
these
hal
og ens
:
chl
ori
ne t
o st
eri
li
se wat
er
chl
ori
ne i
s al
so
u s
e d
to
ma ke
pest
i ci
des
and
plast
ics
i
odine
is
used t
o st
eri
li
se wounds
.
5. St
ate t
hat
sodium chlor
ide
is
used
:
as
a pr
eservati
ve
as
a f
lavour
ing
t
o manufact
ure chl
o r
ine
.
6. Halogens
react
wi
th
alkal
i
metal
s and
produce
met
al
hal
ides.
For
exampl
e,
chl
ori
ne
react
s wi
th
sodi
um to
produce
sodium chl
ori
de
.
7. Wr
it
e a
w or
d equat
ion
for
t
he
above
chemi
cal
r
eact
ion
:
8. Compl
ete
the
fol
lowi
ng
chemi
cal
r
eact
ions
:
i
) sodi
um
+ f
luor
ine
Sodi
um
fl
uor
ide
ii) Pot
assi
um
+ i
odi
ne
Pot
assi
um
iodi
de
iii) Li
thi
um
+ chl
ori
ne
li
thi
um
chl
ori
de
9. Mat
ch
of
the
fol
lowi
ng
hal
ogens
to
thei
r
desc
ript
ions
:
10. Rewrite the following halogens, in the order of reactivity. Lowest first
chlorine, fluorine, bromine and iodine.
Iodine bromine chlorine
fluorine

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Displacement reactions:
i) c
h l
ori
ne
displ
aces
bromi
des
and
iodi
des
ii) br
omi
ne
displ
aces
i
o di
des
.
12. If you add chlorine to the following compounds, in a test tube, what will
you observe?
i) potassium iodide purple colour iodine gets displaced
ii) Potassium bromide orange, bromine gets displaced
iii) Write two word equations to describe the above two reactions
13. All the halogens have similar chemical properties, because they all have
7 outer shell electrons.…read more

Comments

lisa linsdell

These are the answers to the C3e Group 7 Element Foundation Questions that are available in a separate document. A very good revision aid.

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