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How to distinguish common metals
Identify metals by color
of metals have a gray color with shades that are difficult to
However, there are two metals that have a characteristic color :
- Gold ( yellow )
- Copper ( orange-red )
Behavior of a metal in presence of a magnet
A magnet, placed close to several metals, only attracts iron
A magnetic test can therefore detect the iron among other metals.
- In a recycling center the iron can be separated from other metals
- A magnet can also attract an alloy containing some iron like steel or
The density of metals
of a solid or a liquid can be calculated with the following
d is density ( no unity ), m is mass ( in kilogramme ) and V is volume
(in liters orcubic decimeter )
metal has its own density that can be therefore used to identify it.
density of an object made of pure aluminum is always 2,7 regardless of
its size and its shape. Furthermore if the density of an unknown metal
is 2.7 then this metal is pure aluminium.
Aluminum: d = 2.7
Zinc: d = 7.1
iron: d = 7.3
Copper: d = 8.9
Silver: d = 10.5
Or: d = 19.2
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