EVERYDAY SCIENCE

Detailed explanation-1: -Chemical reactions that release energy are called exothermic. In exothermic reactions, more energy is released when the bonds are formed in the products than is used to break the bonds in the reactants. Exothermic reactions are accompanied by an increase in temperature of the reaction mixture.

Detailed explanation-2: -An exothermic reaction is a chemical reaction that releases energy by light or heat. It is the opposite of an endothermic reaction. Expressed in a chemical equation: reactants → products + energy.

Detailed explanation-3: -Chemical energy, which is both produced and consumed in different chemical reactions, is an important way of storing energy in foods, fat reserves and fuels. In energy producing (exothermic) reactions the total energy of the products is less than that of the reactants-energy is released to the surroundings.

Detailed explanation-4: -In exothermic chemical reactions, the heat that is released by the reaction takes the form of electromagnetic energy or kinetic energy of molecules.

Detailed explanation-5: -An endothermic reaction is any chemical reaction that absorbs heat from its environment. The absorbed energy provides the activation energy for the reaction to occur. A hallmark of this type of reaction is that it feels cold.