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CHEMISTRY DEPARTMENT
WAID ACADEMY
Standard Grade
Topic 14
Which three plants have nitrogen fixing
bacteria in root nodules?
1. Peas, beans and clover.
2. Peas, beans and
carrots.
3. Beans, carrots and
potatoes.
4. Peas, beans and
potatoes.
20
po
t..
.
p.
..
d
as
,b
ea
ns
an
d
an
ar
ro
ts
Pe
B
ea
ns
,c
,b
ea
as
Pe
Pe
as
,b
ea
ns
ns
an
an
d
d
ca
cl
ov
rr
...
er
.
0% 0% 0% 0%
Which three elements are essential for
healthy plant growth?
1. Nitrogen, phosphorus
and sulphur.
2. Nitrogen, phosphorus
and potassium.
3. Nitrogen, sulphur and
potassium.
4. Sulphur, potassium
and phosphorus.
20
...
..
ur
,p
ot
as
s
iu
m
ur
a
lp
h
su
lp
h
Su
N
itr
og
en
,
ph
en
,
itr
og
N
N
itr
og
en
,
ph
os
p
os
p
ho
r ..
ho
ru
...
0% 0% 0% 0%
What is the function of the nitrogen fixing
bacteria present in plants such as peas?
tr.
..
ct
er
ia
tu
rn
ni
a.
tu
rn
ct
er
ia
ba
e
Th
Th
e
ba
ba
e
Th
..
...
k
br
ea
ct
er
ia
tu
rn
ni
tr.
..
0% 0% 0% 0%
ct
er
ia
4.
ba
3.
e
2.
The bacteria turn nitrogen in the
air directly into ammonia.
The bacteria break down nitrate
compounds in the soil directly
into ammonia.
The bacteria turn ammonia in
the air directly into nitrate
compounds in the soil.
The bacteria turn nitrogen in the
air directly into nitrate
compounds in the soil.
Th
1.
30
In nature nitrogen is recycled between the
soil and the atmosphere by
a.
..
.
pe
g
lp
nt
in
pl
a
rm
er
s
fa
th
e
de
ca
y
us
i
ng
of
d
ea
na
t
ur
al
.
la
n.
..
ic
i..
ar
tif
in
g
rm
er
s
fa
4.
0% 0% 0% 0%
ad
d
3.
rm
er
s
2.
farmers adding artificial
fertilisers to the soil.
farmers using natural
fertilisers such as compost
and manure.
the decay of deal plants
and animals.
farmers planting peas and
beans in their fields every
2 or 3 years.
fa
1.
30
In the Haber process ammonia is
manufactured using the reactants
25
1. nitrogen and water
2. ammonium nitrate and
soda lime
3. hydrogen and air
4. nitrogen and hydrogen
en
r
en
hy
d
an
d
ro
g
ai
.
a.
an
d
dr
og
ni
tro
g
en
hy
ni
tr
at
e
m
m
on
iu
am
ni
tro
g
en
an
d
w
at
er
0% 0% 0% 0%
The catalyst used in the Haber Process is
platinum
iron
lead
an enzyme
0%
ym
e
ad
0%
an
en
z
le
n
0%
iro
at
in
u
m
0%
pl
1.
2.
3.
4.
20
The reaction conditions used in the Haber
Process are
a.
.
re
a.
.
10
00
ss
u
at
m
.p
re
re
s
at
m
.p
20
0
at
00
su
re
re
ss
u
m
.p
re
su
re
an
d
...
...
0% 0% 0% 0%
10
4.
re
s
3.
at
m
.p
2.
1 atm. pressure and room
temperature.
1000 atm. pressure and
200oC
200 atm. pressure and
500oC
1000 atm. pressure and
1000oC
1
1.
30
The test for ammonia is that
ris
ti.
.
ct
e
ar
a
ch
a
ha
s
It
.
...
pa
pe
m
oi
st
tu
rn
s
it
ry
ve
is
it
pH
in
so
lu
bl
e
pH
pa
pe
...
w
a.
..
0% 0% 0% 0%
m
oi
st
4.
tu
rn
s
2.
3.
It turns moist pH paper
blue.
it is very soluble in water.
it turns moist pH paper
orange.
It has a characteristic
smell.
It
1.
30
Ammonia can be prepared in the laboratory
by
iu
m
...
a.
..
of
re
am
m
on
ac
t
in
g
a
at
in
g
he
he
at
in
g
a
m
ix
m
ix
tu
re
tu
re
of
..
n.
..
of
tu
re
m
ix
4.
0% 0% 0% 0%
a
3.
at
in
g
2.
heating a mixture of nitrogen
and hydrogen.
heating a mixture of an
ammonium compound and
hydrochloric acid.
heating a mixture of an
ammonium compound and
an alkali.
reacting ammonium
hydroxide and nitric acid.
he
1.
30
What is the percentage of nitrogen in
ammonium nitrate, NH4NO3?
17.5%
25%
35%
40%
0%
0.
4
0%
0.
35
0%
0.
25
5
0%
0.
17
1.
2.
3.
4.
60