Question

Suppose two chemicals are reacted together. It takes 750 kJ of energy to break the bonds of the reactants and 1050 kJ of energy are released by the formation of the products. Which statement is true about the reaction? The reaction is exothermic. The reaction is endothermic. The reaction will not proceed without addition of energy. The reaction will absorb energy from its surroundings.

Answer 1

more energy is released than is used to break bonds thus it is an exothermic reaction

Answer 2

Answer: Option (a) is the correct answer.

Step-by-step explanation:

A reaction in which more energy is released as compared to the energy absorbed by reactant molecules is known as an exothermic reaction.

Also, energy of reactants is more than the energy of products in an exothermic reaction.

For example, if 750 kJ of energy is used to break the bonds of the reactants and 1050 kJ of energy are released by the formation of the products. Then, 750 kJ - 1050 kJ = -300 kJ is the excess energy that is released.

On the other hand, a chemical reaction in which more energy is absorbed that energy released is known as an endothermic reaction.

Energy of products is more than the energy of reactants in an endothermic reaction.

Therefore, we can conclude that the statement the reaction is exothermic, is true about the given reaction.