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A chemical bond is formed when two elements combine.They could form chemical bond via an ionic bond by exchange of electrons or by covalent bond i.e. by sharing electrons.

When they are chemically bonded, a new substance is formed whose properties may or may not be similar to the constituent elements. For example :- H2 is a gas which burns and O2 is a gas which causes combustion but they combine to form water which extinguishes fire.

Also, when a chemical bond is formed, some energy might be released to the surroundings showing the reaction is exothermic or some energy might be absorbed showing that it is an endothermic reaction.

Also,a decrease in the concentration of reactants is observed and an increase in conc. of products is observed.

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