What is endothermic and exothermic reaction?

Answer 1

Endothermic; that reaction in which energy is absorbed is called endothermic reaction, mostly the breaking of a molecule is an endothermic reaction, as for breaking process energy is required, when a molecule gets the sufficient energy it breaks.

EXOTHERMIC Reaction is that in which energy is released, as combining of any two element or atoms to make a molecule, take the example of formation of CO2.

Answer 2

exothermic reacticon-a chemical reaction in which energy is released to the surroundings as heat

endothermic reaction- a chemical reaction in which more energy is needed to break the bonds in the reactants than is given off by forming bonds in the products

Answer 3

Many chemical reactions release energy in the form of heat, light, or sound. These are exothermic reactions. Exothermic reactions may occur spontaneously and result in higher randomness or entropy (ΔS > 0) of the system. They are denoted by a negative heat flow (heat is lost to the surroundings) and decrease in enthalpy (ΔH < 0). In the lab, exothermic reactions produce heat or may even be explosive. There are other chemical reactions that must absorb energy in order to proceed. These are endothermic reactions. Endothermic reactions cannot occur spontaneously. Work must be done in order to get these reactions to occur. When endothermic reactions absorb energy, a temperature drop is measured during the reaction. Endothermic reactions are characterized by positive heat flow (into the reaction) and an increase in enthalpy (+ΔH).