Bond energy is best described as the energy required to break or form a given chemical bond?

• A. Break a bond
• B. Break or form a given chemical bond
• C. Transfer energy
• D. Change phase

Answer: (B)

Bond energy measures how strong a bond is by looking at the energy involved in bonds between atoms. It is defined as the energy needed to break one mole of bonds in gaseous molecules. Since forming a bond releases energy, the energy change when a bond forms is the opposite in sign to the energy required to break it. So the concept inherently covers both breaking and forming a bond. Among the options, describing the energy in terms of breaking or forming a given bond best captures that both processes are tied to the same bond strength. The other choices miss this link: breaking a bond only accounts for one direction, changing phase is unrelated to bond strengths, and transferring energy is too vague to describe the specific bond-related energy.