Question

A reaction involved in the formation of ozone in the upper atmosphere is O₂⟶2O. Without referring to Table 10.3, indicate whether this reaction is endothermic or exothermic. Explain.

Answer 1

The reaction O₂➔2O involved in the formation of ozone in the upper atmosphere is an endothermic process as it requires the absorption of ultraviolet radiation to proceed.

Step-by-step explanation:

The reaction that forms ozone from oxygen in the upper atmosphere is O₂➔2O.

This reaction is endothermic. An endothermic reaction is characterized by the absorption of energy from the surroundings. In the case of ozone formation, the necessary energy is provided by ultraviolet radiation in the upper atmosphere.

This energy is required to break the strong O₂ molecular bonds, allowing individual oxygen atoms to then bond with other O₂ molecules to form ozone (O₃).