Which statement describes an exothermic process?

Which statement describes an exothermic process?

• A. It releases heat to the surroundings
• B. It absorbs heat from the surroundings
• C. It requires a positive enthalpy change
• D. It occurs only at high temperatures

Answer: (A)

Exothermic processes release energy as heat to the surroundings, meaning the system loses heat and its enthalpy decreases (negative ΔH). That makes the statement about releasing heat to the surroundings the best description. In contrast, an endothermic process absorbs heat from the surroundings (positive ΔH). The idea that an exothermic process requires a positive enthalpy change is incorrect. Also, exothermic events are not limited to high temperatures; they can occur at various temperatures, including room temperature, as long as the overall enthalpy change is negative.

Exothermic processes release energy as heat to the surroundings, meaning the system loses heat and its enthalpy decreases (negative ΔH). That makes the statement about releasing heat to the surroundings the best description. In contrast, an endothermic process absorbs heat from the surroundings (positive ΔH). The idea that an exothermic process requires a positive enthalpy change is incorrect. Also, exothermic events are not limited to high temperatures; they can occur at various temperatures, including room temperature, as long as the overall enthalpy change is negative.