Ch 3 Metals And Non Metals :
What are Metals?
> Metals are the elements which can easily
form positive ions by losing electrons. Eg :
magnesium.
Physical Properties of Metals:
(i) Conduction of heat and electricity:
Metals are good conductors of heat and
electricity.
(ii) Metallic lustre: Metals have shining
surface.
(iii) Strength: Metals have high tensile
strength.
(iv) Melting points and boiling points:
Except sodium and potassium, metals have
very high melting points and boiling points.
Iron melts at 1539°C.
(v) Malleability and ductility: Metals can be
drawn into thin wires (ductile). It can also
be beaten into thin sheets with a hammer
(malleable).
(vi) Densities: Except sodium and
, potassium, metals are quite hard and have
high densities.
Chemical Properties of Metals:
* Metals produce metal oxide when reacting
with the oxygen in the air.
* Some metals like sodium and potassium
are highly reactive and they can react
vigorously with moisture in the air and are
thus, stored in an oil bottle.
* Metals are highly corrosive and they react
with oxygen and water in the air to form
rust.
* Meals react with bases to form salt and
liberate hydrogen.
* Metals are good reducing agents
Uses and Applications of Metals:
*
* Construction Industry: Metals are the
most component within the housing
industry. Iron and steel are amongst the
most utilized metals in the construction of
buildings and even homes.
* Electronics: Metals are utilised to make
cables and parts for electrically powered
What are Metals?
> Metals are the elements which can easily
form positive ions by losing electrons. Eg :
magnesium.
Physical Properties of Metals:
(i) Conduction of heat and electricity:
Metals are good conductors of heat and
electricity.
(ii) Metallic lustre: Metals have shining
surface.
(iii) Strength: Metals have high tensile
strength.
(iv) Melting points and boiling points:
Except sodium and potassium, metals have
very high melting points and boiling points.
Iron melts at 1539°C.
(v) Malleability and ductility: Metals can be
drawn into thin wires (ductile). It can also
be beaten into thin sheets with a hammer
(malleable).
(vi) Densities: Except sodium and
, potassium, metals are quite hard and have
high densities.
Chemical Properties of Metals:
* Metals produce metal oxide when reacting
with the oxygen in the air.
* Some metals like sodium and potassium
are highly reactive and they can react
vigorously with moisture in the air and are
thus, stored in an oil bottle.
* Metals are highly corrosive and they react
with oxygen and water in the air to form
rust.
* Meals react with bases to form salt and
liberate hydrogen.
* Metals are good reducing agents
Uses and Applications of Metals:
*
* Construction Industry: Metals are the
most component within the housing
industry. Iron and steel are amongst the
most utilized metals in the construction of
buildings and even homes.
* Electronics: Metals are utilised to make
cables and parts for electrically powered
