Intermediate 1 Unit 2a Metals

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Intermediate 1 Unit 2a Metals
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Name some metals found uncombined in the Earths
crust
Gold, silver and copper
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Are most metals found combined to other elements
or uncombined?
Combined to other elements
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How is iron extracted from its ore?
Heated with carbon
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Name a metal extracted from its ore using
electricity.
Aluminium
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Which type of elements are conductors of
electricity?
Metals
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Which non-metal element conducts electricity?
Carbon (graphite)
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What is an insulator of electricity?
A substance which does not allow electricity to
pass through it
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What is an alloy?
A mixture of metals or a mixture of metals with
non-metals.
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Give three examples of an alloy.
Brass, bronze, solder, steel
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What is produced in the reaction of a metal with
oxygen?
A metal oxide
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Which gas is produced when a metal reacts with
acid?
Hydrogen gas
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Name three metals which do not react with dilute
acid.
Gold silver and copper
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What is the test for hydrogen gas?
Burns with a pop
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Name a metal which reacts with oxygen but does
not react with water. (Use data booklet)
Aluminium, zinc, iron, and those below iron in
the table in the data booklet
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Why is aluminium used for aircraft bodies? (Use
data booklet)
Low density/ not heavy
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What term is used to describe the corrosion of
iron?
Rusting
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Name the two conditions needed for rusting.
Water and oxygen
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What can be used to show the extent of the
rusting process?
Rust indicator turns blue
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Do acid rain and salt speed up or slow down the
rusting process?
Speed it up
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Give four examples of surface barriers which can
be used to protect against corrosion.
Painting, greasing, electroplating, galvinising,
tin-plating, plastic coating.
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Which metal is used to galvanise iron?
Zinc
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How do surface barriers protect against corrosion?
They stop the water and oxygen making contact
with the iron
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Which metal is anodised?
Aluminium
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Would iron rust if attached to attaching
magnesium (more reactive metal)?
No
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Would iron rust if a tin coating was scratched?
Yes - tin is less reactive than iron
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Would iron rust if a zinc coating was scratched?
No -zinc is more reactive than iron
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What happens to the oxide layer when aluminium is
anodised?
It becomes thicker
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Intermediate 1 Unit 2a
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