Chemistry Reference
In-Depth Information
a (i)
Explain how this experiment shows that
the burning of ethanol is an exothermic
reaction.
(iii)
Diamond has a similar structure and
consequently similar properties. Give
two
physical properties common to both
diamond and silicon(
iv
) oxide. [2]
[Total: 14]
(Cambridge IGCSE Chemistry 0620 Paper 31
Q2 November 2008)
[1]
(iii)
Complete the word equation for the
complete combustion of ethanol.
ethanol + oxygen → ______ + ______
[2]
b
Ethanol is a fuel containing carbon. State
the names of two other commonly used fuels
containing carbon.
20
The electrolysis of concentrated aqueous sodium
chloride produces three commercially important
chemicals: hydrogen, chlorine and sodium
hydroxide.
a
The ions present are Na
+
(
aq
), H
+
(
aq
) ,C
l
−
(
aq
)
and OH
−
(
aq
).
(iii)
Complete the ionic equation for the
reaction at the negative electrode
(cathode).
______ + ______ → H
2
[2]
c
Give the formula of the functional group
present in ethanol.
[1]
d
The can contains water. Describe a chemical
test for water. [2]
e
The iron can used in this experiment rusts easily.
(iii)
Describe a method which can be used to
prevent iron from rusting. [1]
(iii)
Rust contains hydrated iron(
iii
) oxide. What
do you understand by the term
hydrated
? [1]
(iii)
Iron is a transition metal. State
two
properties
which are typical of transition metals. [2]
[Total: 12]
(Cambridge IGCSE Chemistry 0620 Paper 02
Q5 November 2008)
[1]
(iii)
Complete the ionic equation for the
reaction at the positive electrode (anode).
______ + ______ → C
l
2
[1]
(iii)
Explain why the solution changes from
sodium chloride to sodium hydroxide. [1]
b (i)
Why does the water supply industry use
chlorine? [1]
(iii)
Name an important chemical that is made
from hydrogen.
19
There are three types of giant structure - ionic,
metallic and macromolecular.
a
Sodium nitride is an ionic compound. Draw
a diagram that shows the formula of the
compound, the charges on the ions and the
arrangement of the valency electrons around
the negative ion.
Use x to represent an electron from a sodium atom.
Use o to represent an electron from a nitrogen
atom.
[1]
(iii)
How is sodium hydroxide used to make
soap? [2]
[Total: 7]
(Cambridge IGCSE Chemistry 0620 Paper 31
Q5 November 2008)
[3]
21
Helium and argon are noble gases.
a
State
one
use of helium. [1]
b
The atomic structures of helium and argon are
shown below.
b (i)
Describe metallic bonding.
[3]
(iii)
Use the above ideas to explain why:
metals are good conductors of
electricity,
[1]
metals are malleable.
[2]
c
Silicon(
iv
) oxide has a macromolecular
structure.
(iii)
Describe
the structure of silicon(
iv
) oxide
(a diagram is not acceptable).
X
[3]
helium
argon
