AP BIOLOGY

Detailed explanation-1: -The bond-breaking process absorbs energy, which is known as the endothermic process.

Detailed explanation-2: -It takes energy to break bonds. Energy is released when bonds are formed.

Detailed explanation-3: -The type of energy that breaks the bonds can be light, heat, or kinetic. When atoms combine, energy is released. If more energy is released when new bonds are formed, compared to the amount of energy initially absorbed to break the bonds of the first compound, the reaction is called exothermic.

Detailed explanation-4: -Bond energy is also the amount of energy released when a bond is formed. Breaking a bond requires energy, whereas, forming a bond releases energy. In a chemical reaction energy must be added to break the bonds in the reactants to begin the reaction.