PUMPA - SMART LEARNING
எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்
Book Free DemoWhat is a chemical property?
A chemical property is a property of a substance that can be seen when it undergoes a chemical reaction.
Chemical Properties of Aluminium:
(a). Reaction with air:
Aluminium is not affected by dry air.
Aluminium burns brightly at 800°C to form its oxide and nitride.
4Al + 3O_2 → 2Al_2O_3 (Aluminium oxide).
2Al + N_2 → 2AlN (Aluminium nitride).
(b). Reaction with water:
Water does not react with aluminium because of the oxide layer on it. When steam is passed over, the red hot aluminium produces hydrogen.
2Al + 3H_2O → Al_2O_3 + 3H_2↑
(Aluminium) + (Steam) → (Aluminium oxide) + (Hydrogen)
(c). Reaction with alkalis:
Aluminium reacts with caustic soda alkalis to form aluminates.
2Al + 2NaOH + 2H_2O → 2NaAlO_2 + 3H_2↑
(Aluminium) + (Caustic soda) → (Sodium meta-aluminate)
(d). Reaction with acids:
Aluminium reacts with dilute or con. HCl liberates H_2 gas.
2Al + 6HCl → 2AlCl_3 + 3H_2↑
(Aluminium) + (Hydrogen chloride) → (Aluminium chloride) + (Hydrogen)
Aluminium reacts with dilute sulphuric acid releases hydrogen, similarly reacts with hot concentrated sulphuric acid releases sulphur dioxide.
2Al + 3H_2SO_4 → Al_2(SO_4)_3 + 3H_2↑
(Dilute)
2Al + 6H_2SO_4 → Al_2(SO_4)_3 + 6H_2O + 3SO_2↑
(Con.)
Important!
Dilute or concentrated nitric acid does not react with aluminium, but it does render it passive by forming an oxide film on its surface.
(e). Reducing agent:
Aluminium is a highly effective reducing agent.
When a mixture of aluminium powder and iron oxide is ignited, the latter is reduced to metal. This process is known as the aluminothermic process.
Fe_2O_3 + 2Al → 2Fe + Al_2O_3 + Heat.
Uses of Aluminium:
Aluminium is used in various applications.
(a). Household utensils.
Aluminium utensils
(b). Electrical cable industry.
Aluminium cables
(c). Manufacturing of aeroplanes and other industrial machinery parts.
Industrial usage of aluminium
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