Chemistry Reference
In-Depth Information
26
a
Choose from the list of compounds to answer
questions
(iii)
to
(v)
.
calcium carbonate carbon dioxide
hydrogen chloride
iron(
iii
) oxide lead(ii)
ii
) bromide
methane sodium hydroxide
Each compound can be used once, more than
once or not at all.
Name the compound which
(iii)
is a transition metal compound, [1]
(iii)
produces brown fumes at the anode when
electrolysed,
c
Which
two
of these elements make up most of
the air?
[1]
d
Bromine and fluorine form a compound
with the formula BrF
5
. Calculate the relative
molecular mass of BrF
5
.
[1]
e
The diagram shows the structure of some
compounds containing oxygen.
A
B
C
D
K
+
K
+
K
+
K
+
S
O
C
O
O
2-
O
2-
O
N
O
O
O
K
+
K
+
K
+
K
+
O
2-
O
2-
O
2-
K
+
K
+
K
+
K
+
K
+
[1]
(iii)
is used to manufacture lime,
[1]
(iii)
What type of oxide is compound
C
? [1]
(iii)
Compound
A
is an atmospheric pollutant.
Describe the source of compound
A
and
state its effect on the environment. [2]
(iii)
In the presence of air, compound
D
reacts
with water to form nitric acid.
A student used the apparatus shown to add
an aqueous solution of nitric acid to an
aqueous solution of potassium hydroxide.
He added the acid until it was in excess.
(iv)
dissolves in water to form an alkaline
solution, [1]
(v)
is the main constituent of natural gas. [1]
b
At a high temperature iron(
iii
) oxide is reduced
by carbon.
Fe
2
O
3
+ 3C → 2Fe + 3CO
(iii)
Explain how the equation shows that
iron(
iii
) oxide is reduced by carbon.
[1]
(iii)
Complete these sentences about the
extraction of iron using words from the
list.
bauxite blast converter haematite
lime limestone sand slag
burette
solution of
nitric acid
Iron is extracted from ______ by mixing
the ore with coke and ______ in a ______
furnace.
The iron ore is reduced to iron and
impurities in the ore react with calcium
oxide to form ______. [4]
[Total: 10]
(Cambridge IGCSE Chemistry 0620 Paper 02
Q1 June 2009)
flask
27
The list shows some non-metallic elements.
bromine
carbon
fluorine
krypton
nitrogen
oxygen
a
Which
two
elements in the list are in the same
Group of the Periodic Table?
solution of
potassium hydroxide
Describe how the pH of the solution in
the flask changes as the nitric acid is added
until the acid is in excess.
[3]
[1]
b
Which element in the list has the highest
proton number?
[1]
