What does the term 'LEO says GER' refer to in redox reactions?

The term "LEO says GER" is a mnemonic device used to remember the fundamental processes occurring in redox (reduction-oxidation) reactions. This phrase stands for "Loss of Electrons is Oxidation" and "Gain of Electrons is Reduction."

In redox reactions, oxidation refers to the process where a substance loses electrons, which causes its oxidation state to increase. Conversely, reduction involves a substance gaining electrons, resulting in a decrease in its oxidation state. This concept is crucial in understanding how electrons transfer during chemical reactions, and it highlights the interrelationship between oxidation and reduction processes.

Understanding this mnemonic helps to clarify the roles of different species in a redox reaction, such as identifying which reactant is being oxidized and which is being reduced. Consequently, the phrase "LEO says GER" effectively encapsulates the essence of how electrons are involved in redox chemistry.