C3e Group 7 Elements Question higher

C3e Group 7 Elements Question higher paper

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  • Created on: 05-05-12 09:34
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C3eHig her onl
y:
1.S o di
um react
s wit
h chl
ori
ne, vi
olent
ly,
t
o f
orm sodi
um chlor
ide.
Writ
e a
b al
anced
s ymb ol
equat
ion
for
thi
s.
C hoose
a not
her
a l
kal
i
me t
al
and wri
t
e
a si
milar
b alanced
symb ol
equati
on f
or
the same react
ion:
2.P redict
t
he pr
o per
ti
es of
f
luori
ne and ast
ati
ne,
fr
om the
propert
ies
of
the r
est
of
t he
halogens
g i
ven
the t
able:
(you
ma y
use
a gr
aph sheet
t
o pr
ed i
ct,
but
do
w it
ho ut
i
t
fi
rst
)
element atomic number colour state at room boiling point in
temperature °C
f
luor
ine 9 Pale yellow gas -188
chl
ori
ne 17 pal
e gr
een gas 35
br
omi
ne 35 orange l
i
q ui
d 59
120 to 190 ( actual
i
odi
ne 53 dar
k gr
ey sol
id 184)
300 to 350 ( actual
Ast
ati
ne 85 337)
3 .A more
react
ive
hal
ogen wi
ll
di
splace
a l
esson
react
ive
hal
o gen
fr
om i
ts
hali
de.
For
example
see t
he
fol
lowi
ng react
ion.
Wri
te
a bal
anced symbol
equat
ion
for
t
his:
chlorine + sodium bromide sodium chloride + bromine
(colourless) (orange colour of bromine shows)
Bromine + sodium iodide sodium bromide + iodine
(orange) (purple colour of iodine)
4.Pre di
c t
the
d i
s pla c eme nt r
e ac t
ions
of:
A stati
n e w i
th any o t
h er alkali
me ta l
ha li
d e
F l
uo ri
n e w i
th any o t
h er alkali
me ta l
ha li
d e
5.Halogens have similar properties because when they react, an atom gains one electron to form
a negative ion with a stable electronic structure. For example, chlorine gains in electron from
sodium:
+
Na
e Na
Cl
2 + 2e 2Cl
+
Na +
C l
Na Cl

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Wri
te
a bal
anced
elect
roni
c equat
ion
to
show t
he
for
mat
ion
of
a br
omi
de
ion
f
rom
a br
o mi
ne molecul
e:
7.The r
eacti
vit
y decr
eases as
you go
down i
n gr
ou p
7.
The most r
eacti
ve hal
ogen
i
s f
luor
ine
an d
the
least
r
eacti
ve
ha l
ogen
is
astat
ine.…read more

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