Which equation represents oxidation and reduction in terms of electron transfer?

The phrase "OIL RIG" describes the fundamental concepts of redox reactions, where oxidation and reduction are defined in terms of electron transfer. In this mnemonic, "Oxidation Is Loss" indicates that when a substance is oxidized, it loses electrons. Conversely, "Reduction Is Gain" signifies that when a substance is reduced, it gains electrons. This clear distinction is crucial for understanding how redox reactions operate in various biological and chemical processes.

Knowing that oxidation involves the loss of electrons helps to identify substances that are being oxidized in reactions, such as in cellular respiration or photosynthesis. Understanding reduction as the gain of electrons allows us to recognize which substances are being reduced in similar reactions. This concept is foundational in fields such as biochemistry, where electron transfer plays a vital role in energy production and biochemical pathways.

The other phrases do not accurately convey these fundamental notions. Some may introduce confusion or are simply incorrect formulations that do not pertain closely to the principles of oxidation and reduction. Thus, "OIL RIG" is the most effective and widely recognized way to remember and apply these ideas in a variety of contexts.