If energy is written on the product side of a chemical reaction, does it indicate that the reaction is endothermic or exothermic? are bonds broken or formed ?

If energy is written on the product side of a chemical reaction, it indicates that the reaction is AN EXOTHERMIC REACTION.
An exothermic reaction is a type of reaction in which the energy released during the reaction is more than the energy that is absorbed.
Note that, during a chemical reaction, the chemical bonds in the reactants are broken down while new bonds are formed in the products. Thus, whether a reaction is exothermic or endothermic depend on the difference between the energy that is needed to break the existing bonds and the energy released when new bonds are made. 

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