Question

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 ?

Answer 1

answer:

1) reaction is exothermic
2) some bonds are broken and some are formed (see explanation below)

Explanation:

When energy is written on the product side of a chemical reaction, means that the energy is appearing as consequence of the reaction, that is a released energy  (heat) that heats the surroundings.

This kind of reaction where heat is released and, as a consequence, the temperature of the surroundings increase, is called exothermic.

In every chemical reaction some bonds are broken and others are formed.

Breaking bonds requires energy.

Forming bonds release energy.

The energy written on the chemical reaction is a net change of energy: the bonds broken on the reactant side used energy and bonds formed on the products side released energy.

When the energy released by the formation of the product is greater than the energy of the bonds broken on the reactant side, the chemical reaction is exothermic.

Answer 2

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.