Transcript Unit 2 Metals

Intermediate 1 Unit 2a Metals
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Name some metals found
uncombined in the Earth’s crust
Gold, silver and copper
Are most metals found combined
to other elements or
uncombined?
Combined to
other elements
How is iron extracted from
its ore?
Heated with carbon
Name a metal extracted from its
ore using electricity.
Aluminium
Which type of elements are
conductors of electricity?
Metals
Which non-metal element
conducts electricity?
Carbon (graphite)
What is an insulator of
electricity?
A substance which does not
allow electricity to pass
through it
What is an alloy?
A mixture of metals or a
mixture of metals with
non-metals.
Give three examples of an alloy.
Brass, bronze, solder,
steel
What is produced in the reaction
of a metal with oxygen?
A metal oxide
Which gas is produced when a
metal reacts with acid?
Hydrogen gas
Name three metals which do not
react with dilute acid.
Gold silver and copper
What is the test for hydrogen gas?
Burns with a pop
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
Why is aluminium used for
aircraft bodies?
(Use data booklet)
Low density/ not heavy
What term is used to describe the
corrosion of iron?
Rusting
Name the two conditions needed
for rusting.
Water and oxygen
What can be used to show the extent
of the rusting process?
Rust indicator
turns blue
Do acid rain and salt speed up or
slow down the rusting process?
Speed it up
Give four examples of surface
barriers which can be used to
protect against corrosion.
Painting, greasing,
electroplating, galvinising,
tin-plating, plastic coating.
Which metal is used to
galvanise iron?
Zinc
How do surface barriers protect
against corrosion?
They stop the water
and oxygen making
contact with the iron
Which metal is anodised?
Aluminium
Would iron rust if attached to
attaching magnesium (more
reactive metal)?
No
Would iron rust if a tin coating
was scratched?
Yes - tin is less
reactive than iron
Would iron rust if a zinc coating
was scratched?
No -zinc is more
reactive than iron
What happens to the oxide layer
when aluminium is anodised?
It becomes thicker
Intermediate 1 Unit 2a
1
2
8
9
15
16
22
3
10
17
23
4
11
18
24
5
6
7
12
13
14
19
25
20
26
21
27