Transcript A solution of nickel(II) sulphate is electrolysed using

CHEMISTRY DEPARTMENT
WAID ACADEMY
Redox and Faraday
A solution of nickel(II) sulphate is
electrolysed using nickel electrodes.
The passage of 96500 coulombs results in
1.
the negative electrode gaining 29.5 g
2.
the positive electrode gaining 29.5 g
3.
the negative electrode gaining 59 g
4.
the positive electrode gaining 59 g
60
Seconds
Remaining
e.
..
..
el
e
e
tiv
e
tiv
ct
ro
d
tr
od
.
el
ec
ct
ro
d
th
e
po
si
ne
ga
e
th
po
si
e
th
th
e
ne
ga
tiv
e
tiv
e
el
e
el
ec
tr
od
.
e.
..
..
0% 0% 0% 0%
What mass of copper metal, in grams, would be
deposited by electrolysis of a solution of Cu2+(aq)
ions if ½ Faraday of electrical energy were
passed?
60
Seconds
Remaining
.8
15
0%
g
75
g
g
5
.7
31
.5
0%
95
0%
g
0%
7.
63.5 g
31.75 g
15.875g
7.95g
63
1.
2.
3.
4.
In which of the following would a
displacement reaction take place?
ga
.
..
l..
.
lo
rin
e
so
g
ch
br
om
in
e
so
B
ub
bl
in
in
g
dd
A
A
dd
in
g
br
om
in
e
ch
lo
rin
e
g.
.
l..
.
0% 0% 0% 0%
g
4.
bl
in
3.
60
Seconds
Remaining
ub
2.
Bubbling chlorine gas
through an aqueous solution
of sodium fluoride.
Adding bromine solution to
an aqueous solution of
sodium chloride.
Adding bromine solution to
an aqueous solution of
sodium fluoride.
Bubbling chlorine gas
through an aqueous solution
of sodium iodide.
B
1.
If 96 500 coulombs of electrical charge are passed
through separate solutions of copper(II) chloride
and nickel(II) chloride, then
ffe
re
n
tn
..
of
.
um
w
ill
s
e
th
di
m
et
al
m
e
sa
be
rs
be
ro
m
be
nu
pl
a.
f.
..
...
op
of
c
e
th
..
0% 0% 0% 0%
se
s
4.
60
Seconds
Remaining
lm
as
3.
ua
2.
equal masses of copper and nickel
will be deposited.
the same number of atoms of each
metal will be deposited.
the metals will be plated on the
positive electrode.
different numbers of moles of each
metal will be deposited.
eq
1.
During a redox reaction in acid solution, iodate ions, IO3-(aq) are
converted into iodine, I2aq).
IO3-  I2
The number of H+(aq)and H2O(l) required to balance the ion-electron
equation for the formation of 1 mole of iodine are, respectively.
6 and 3
3 and 6
12 and 6
6 and 12
60
Seconds
Remaining
12
0%
6
an
d
6
an
d
12
an
d
3
an
d
0%
6
0%
3
0%
6
1.
2.
3.
4.
Which of the following is a redox reaction?
3.
C
4.
D
60
Seconds
Remaining
0%
0%
0%
0%
D
B
C
2.
B
A
A
1.
How many moles of iodide ions are oxidised by
one mole of permanganate ions?
1½
2
2½
5
60
Seconds
Remaining
0%
5
½
0%
2
0%
2
½
0%
1
1.
2.
3.
4.
What is the quantity of electricity needed to
produce 0.25 moles of copper?
24 125 C
48 250 C
96 500 C
193 000C
60
Seconds
Remaining
00
0
C
C
0%
19
3
50
0
96
25
0
48
12
5
0%
C
0%
C
0%
24
1.
2.
3.
4.
In which of the following reactions is
hydrogen acting as an oxidising agent?
1.
2.
3.
4.
H2 + C2H4  C2H6
H2 + Cl2  2HCl
H2 + 2Na  2NaH
H2 + CuO  Cu +
H2O
60
Seconds
Remaining
In a redox reaction 20 cm3 of 0.02 mol l-1 acidified
potassium permanganate solution was used.
How many moles of permanganate ions were
used?
0.4 mol
2.0 mol
0.0004 mol
0.002 mol
60
Seconds
Remaining
0%
m
ol
2
00
0.
0.
00
04
m
ol
0
2.
0%
m
ol
0%
4
m
ol
0%
0.
1.
2.
3.
4.