SSC MTS EXAM

Detailed explanation-1: -In a physical change, no energy is generated. In a chemical change, energy is generated (heat, light, sound, etc.) Physical change includes very little to no absorption of energy. In a chemical reaction, absorption and evolution of energy take place.

Detailed explanation-2: -The correct option is B True Heat energy is either absorbed or evolved during a chemical change.

Detailed explanation-3: -Chemical reactions that absorb (or use) energy overall are called endothermic. In endothermic reactions, more energy is absorbed when the bonds in the reactants are broken than is released when new bonds are formed in the products.

Detailed explanation-4: -Whether a chemical reaction absorbs or releases energy, there is no overall change in the amount of energy during the reaction. That’s because energy cannot be created or destroyed. This is the law of conservation of energy.