C5 – Molecules in the air
5 a day revision
Boiling point
State at room
temperature
Density
Electrical
conductivity
-218C
gas
very low
does not
conduct
Use ideas about bonding and forces between
molecules to explain the properties of oxygen.
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C5 – Ionic compounds
5 a day revision
Describe ionic
bonding.
State two
properties of ionic
compounds.
Some tests are carried out on a
water sample. Use the
information in the table to
identify the three ions that are
present.
Test 1.
A white precipitate formed when
sodium hydroxide was added. It
dissolved when excess sodium
hydroxide was added.
Test 2.
Bubbles of gas were given off
when nitric acid was added to
the sample.
When silver nitrate was added a
cream precipitate formed.
Potassium chloride is an example of a salt found
in the sea. Complete the table of results and give
reasons for your answers.
Zinc ions can be detected
by adding carbonate ions
(CO32-) to form the
insoluble compound zinc
carbonate (ZnCO3). Work
out the charge on the zinc
ion and write a balanced
ionic equation, including
state symbols.
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C5 – Giant molecules and metals
5 a day revision
Carbon dioxide has a simple
molecular structure,
diamond has a giant covalent
structure. Describe the main
differences between the two
types of structure.
Diamond and graphite are both minerals
formed from pure carbon. Explain why
graphite can conduct electricity but
diamond can’t. You can use a diagram to
help explain your answer.
Some metals can be
extracted from their ores
by heating their metal
oxides with carbon. This is
called a redox reaction.
Describe the two processes
that take place using zinc
oxide as an example.
Describe and
explain 2
properties of
diamond.
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C5 – Equations, masses and electrolysis
5 a day revision
An electric current is passed
through molten potassium
chloride. Write ionic equations
to help explain what happens
at each electrode and name
the products that are formed.
Iron oxide can be
heated with charcoal to
extract the iron. In one
reaction the iron oxide,
Fe2O3, reacts with
carbon to produce iron
and carbon dioxide.
Write a balanced
symbol equation for
this reaction.
The diagram shows electricity being
passed through molten lead bromide.
What will form at each electrode?
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C5 – Metals and the environment
5 a day revision
Copper is used to make electrical wiring for homes. Give one
reason why copper is a good choice for making electrical wiring
and two disadvantages of using copper for this purpose.
A mining company can
recover 40g of copper ore
from every kilogram cuprite
(Cu2O ) that is mined. of
mined rock. What is the
maximum amount of
copper metal the company
will be able to recover from
a kilogram of mined rock?
Copper extraction causes
environmental problems
due to large amounts of
waste rock. Explain why so
much waste rock is
produced.
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