Protein Definition - Proteins are highly complex molecules that are actively involved in the most basic and important aspects of life. Chemical equations are a symbolic representation of a chemical reaction. The name oxygen comes from the Greek stems oxys, "acid," and gennan, "to form or generate." Visit BYJUS to learn more about it The hypoxia kills many organisms that cannot escape, and thus the hypoxic zone is informally known as the “dead zone.” The earth's crust is 46.6% oxygen by weight, the oceans are 86% oxygen by weight, and the atmosphere is 21% oxygen by volume. Oxidation and reduction in terms of oxygen transfer. The Chemistry of Oxygen. But it was Antoine Lavoisier, sometimes called the father of modern chemistry, who was the first to truly identify oxygen as an element and in doing so, he really helped to firm up the definition that an element is something that cannot be broken down by any kind of chemical analysis. The ultimate biochemical oxygen demand ([UBOD]) is a parameter that quantifies the oxygen required for the total biochemical degradation of organic matter by aquatic microorganisms. A short way of writing a chemical reaction or the chemical changes are chemical equations. Thus, oxygen literally means "acid former." By definition, chemical oxygen demand is “a measure of the oxygen equivalent of the organic matter content of a sample that is suscep-tible to oxidation by a strong chemical oxidant.”* Oxy- These include metabolism, movement, defense, cellular communication, and molecular recognition. [UBOD] and the rate of oxygen consumption are frequently used in mathematical models to predict the impact of an effluent on receiving bodies such as lakes and rivers. The oxygen content of surface waters of normal salinity in the summer is typically more than 8 milligrams per liter (8 mg/L); when oxygen concentrations are less than 2 mg/L, the water is defined as hypoxic (CENR, 2000). The terms oxidation and reduction can be defined in terms of the adding or removing oxygen to a compound. Figure 9.1 Common Organic Functional Groups that Contain Oxygen. It is the job of the reducing agent to remove the oxygen from another substance. In Chemistry, it is referred to as the loss of oxygen when it is with respect to the oxygen transfer. The solubility of oxygen in water is temperature-dependent; it condenses at 90.20 K and freezes at 54.36 K. Key Terms. oxygen: A chemical element (symbol O) with an atomic number of 8 and atomic mass of 15.9994 amu. Oxygen is a strong oxidizing agent and has the second-highest electronegativity of all reactive elements, second only to fluorine. It is one of the main elements that make up air, and it is necessary for the survival of all plants and animals. The Chemical Oxygen Demand (COD) test uses a strong chemical oxidant in an acid solution and heat to oxidize organic carbon to CO 2 and H 2 O. 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