The Formation of Carbon Dioxide: A Closer Look

The Role of Carbon Dioxide in Chemical Reactions

Carbon dioxide (CO2) is a colorless, odorless gas that is naturally present in the Earth's atmosphere. It plays a crucial role in various chemical reactions, including the process of photosynthesis in plants, the carbonation of beverages, and in the formation of acids in the environment.

The mc002-1.jpgHrxn of Formation of Carbon Dioxide

When carbon dioxide is formed from its elements, carbon and oxygen, the reaction is exothermic, resulting in a negative enthalpy change (ΔHrxn). This means that the reaction releases heat to its surroundings. The formation of carbon dioxide can be represented by the chemical equation:

C(s) + O2(g) → CO2(g)

Which Statement is True?

The statement that the ΔHrxn of formation of carbon dioxide is negative is true. This indicates that the reaction is exothermic, as it releases heat during the formation of carbon dioxide.

The Significance of ΔHrxn in Chemical Reactions

The sign of the enthalpy change (ΔHrxn) in a chemical reaction provides important information about the nature of the reaction. A negative ΔHrxn value indicates an exothermic reaction, while a positive value indicates an endothermic reaction.

Conclusion

In conclusion, the formation of carbon dioxide involves an exothermic reaction, with a negative enthalpy change. This plays a vital role in various chemical processes and environmental phenomena, highlighting the significance of carbon dioxide in the world around us.