Here's why:

* Thermochemistry is the study of energy changes that occur during chemical reactions and physical transformations. It focuses on:

* Enthalpy changes (ΔH): The heat absorbed or released during a reaction.

* Entropy changes (ΔS): The change in disorder or randomness of a system.

* Gibbs free energy (ΔG): A measure of the spontaneity of a reaction.

Let me know if you'd like to explore other branches of chemistry!