Bond energy is defined as

Bond energy is defined as

• A. Bond energy is the energy needed to break 1 mole of a particular bond in 1 mole of gaseous molecules.
• B. Bond energy is the energy released when a bond forms.
• C. Bond energy is the energy required to change a substance from solid to liquid.
• D. Bond energy is the energy stored in chemical bonds of a solid.

Answer: (A)

Bond energy is the amount of energy required to break one mole of a specific bond in gaseous molecules. This value is positive because it represents energy that must be put in to overcome the bond and separate the atoms. It is a measure of bond strength for a particular bond type in the gas phase. The energy released when a bond forms is related but opposite in sign to bond energy—that energy change is the bond formation energy (the negative of the bond energy). Other options describe different concepts: energy to melt a solid is enthalpy of fusion, not bond dissociation energy; and energy stored in bonds in a solid is not how bond energy is defined, which specifically concerns breaking bonds in gaseous molecules.

Bond energy is the amount of energy required to break one mole of a specific bond in gaseous molecules. This value is positive because it represents energy that must be put in to overcome the bond and separate the atoms. It is a measure of bond strength for a particular bond type in the gas phase.

The energy released when a bond forms is related but opposite in sign to bond energy—that energy change is the bond formation energy (the negative of the bond energy).

Other options describe different concepts: energy to melt a solid is enthalpy of fusion, not bond dissociation energy; and energy stored in bonds in a solid is not how bond energy is defined, which specifically concerns breaking bonds in gaseous molecules.