What does electrochemistry study?

Electrochemistry focuses on the study of chemical reactions that occur at the interface between an electrode and an electrolyte. These reactions involve the transfer of electrons, which is a hallmark of electrochemical processes. This branch of chemistry examines various phenomena such as oxidation-reduction reactions, battery operations, corrosion, and electrolysis.

The significance of the interface in electrochemistry is crucial, as it is where the conversion of chemical energy into electrical energy (and vice versa) takes place. This makes electrochemistry essential for understanding and developing batteries, fuel cells, and other energy-related technologies.

The other options do not align with the scope of electrochemistry: gaseous reactions pertain to gas-phase chemistry, physical changes at high temperatures relate more to thermodynamics and physical chemistry, and organic reactions occurring in living organisms fall under the category of biochemistry rather than electrochemistry.