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Chemical Equations are used to show the chemical reaction between two substances. 
For example, 
The reaction of sodium and chlorine to form sodium chloride, 2Na+ Cl_{2} = 2NaCl

The burning of coal (carbon) to give carbon dioxide, C +  O_{2} = C O_{2}

The decomposition of water into hydrogen and oxygen gases, 2 H_{2} O = 2 H_{2}  O_{2}

Hope it helps...! ^_^

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