Forming bonds releases energy; this process is which?

Forming bonds releases energy; this process is which?

• A. Endothermic
• B. Exothermic
• C. Adiabatic
• D. Constant temperature

Answer: (B)

When bonds form, energy is released because the system moves to a lower, more stable energy state. In a reaction, you first have to break existing bonds, which requires energy input, and then form new bonds, which releases energy. If the energy released during bond formation exceeds the energy needed to break the initial bonds, the overall process releases heat to the surroundings. That is what “exothermic” means. The other terms aren’t about energy flow from bond changes: adiabatic refers to no heat exchange with the surroundings, and constant temperature describes the environment’s temperature, not the energy change of bond formation. So the correct description is exothermic.

When bonds form, energy is released because the system moves to a lower, more stable energy state. In a reaction, you first have to break existing bonds, which requires energy input, and then form new bonds, which releases energy. If the energy released during bond formation exceeds the energy needed to break the initial bonds, the overall process releases heat to the surroundings. That is what “exothermic” means. The other terms aren’t about energy flow from bond changes: adiabatic refers to no heat exchange with the surroundings, and constant temperature describes the environment’s temperature, not the energy change of bond formation. So the correct description is exothermic.