Question

ANS the question

why chemical bond chemical reaction is needed!??

Answer 1

When element form compound they form chemical or physical bond between them
They react to complete their octet ...
To get stability ....


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Answer 2

 Chemical reactions are so important because not only do they change the property of the substances that go into the reaction, they also store or release energy. For example, you need melt table salt and then force energy into it in order to break the bond between the atoms of sodium and chlorine.

This reaction requires energy to break the chemical bonds, and is called an endothermic reaction. There are other reactions, called exothermic reactions, that actually release energy when chemical bonds are broken. Rusting is an example of an exothermic reaction, since when iron and oxygen interact (usually in the presence of water), energy is released into the environment.