Chemical properties of Non-metals-e Notes


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 Non-metals react with oxygen to form acidic oxides or neutral oxides. The oxides of non-metals dissolve in water to form acids.

·        Examples :            

When Carbon burns in air it reacts with oxygen of air forming an acidic oxide called carbon di-oxide.

In the presence of insufficient oxygen, carbon forms carbon monoxide.

When sulphur is burnt in air, it reacts with the oxygen of air forming an acidic oxide called sulphur di-oxide.

· Hydrogen combines with the oxygen of air forming neutral oxide called water.

 

Reaction of non-metal oxides with water

·                   Carbon di-oxide dissolves in water forming an acid called carbonic acid.

·        Sulphur di-oxide dissolves in water forming an acid called sulphurous acid.

 

·                   Non-metals do not react with water.

Explanation:

·                   Non-metals form negative ions by accepting electrons.

·                   They cannot give electrons to reduce Hydrogen ions of water, and convert them into hydrogen gas.

 

Reaction of Non-metals with Dilute Acids:

·                   Non-metals do not react with dilute acids as they form negative ions by accepting electrons.

·                   They cannot give electrons to reduce Hydrogen ions of acids, and convert them into hydrogen gas.