If one reagent in a reaction contributes oxygen, extracts hydrogen, or extracts electrons, it is said to be an oxidizing agent. This is the combustion of sulfur. ... And in photosynthesis, the reducing agents accompish a task which is essential to our survival. Common oxidizing agents include Oxygen and halogens. Oxidizing agents can be defined as those groups which transfer oxygen atoms to the substrate although it's not true in every case as in many redox reactions, oxidation – reduction takes place in absence of oxygen atoms. That plants resort to cellular respiration may seem a little confusing, as we have always been told that they produce energy by resorting to photosynthesis. Let's look at another example with a different reducing agent. Oxidizing and Reducing Agents An oxidizing agent, or oxidant, gains electrons and is reduced in a chemical reaction. Glucose is the reducing agent so it is being oxidized. S + O2 --> SO2. Given its function, why is this necessary? P680+ is said to be the strongest biological oxidizing agent. The atom or molecule that accepts the electrons (in this case, chlorine) is known as the oxidizing agent, because its acceptance of electrons allows the other molecule to become oxidized. Eg. An oxidizing agent can oxidize a particular substance, hence, making them lose or give away electrons. Intro to redox in cellular respiration. How do Plants Carry Out Cellular Respiration? Mehler observed that the H 2 O 2 formed in this way does not present an active intermediate in photosynthesis; rather, as a reactive oxygen species, it can be toxic to surrounding biological processes as an oxidizing agent. Oxidizing and reducing agents are especially crucial in biological processes such as metabolism and photosynthesis. These oxidizing agents are also called oxygenation reagents or oxygen – atom transfer (OAT) agents. Examples of oxidizing agents The common oxidizing agent in this process is molecular oxygen. Also known as the electron acceptor, the oxidizing agent is normally in one of its higher possible oxidation states because it will gain electrons and be reduced. Light striking a plant pigment known as chlorophyll initiates a complex series of reactions, many of which involve redox processes complete with movement of electrons. For example, organisms use electron acceptors such as NAD + to harvest energy from redox reactions as in the hydrolysis of glucose: ... MnO 4-is the oxidizing agent in the above reaction. Electron carriers. Of course, it is reduced in the process. A. it obtains electrons from the oxygen atom in a water molecule, so it must have a stronger attraction for electrons than oxygen has B. it is the molecule that transfers electrons to plastoquinone (Pq) of the electron transfer system Sulfur is the reducing agent and oxygen is the oxidizing agent. The Mehler reaction is named after Alan H. Mehler, who, in 1951, presented data to the effect that isolated chloroplasts reduce oxygen to form hydrogen peroxide (H 2 O 2). Now let's try a different oxidizing agent with glucose. Oxidizing Agents. Here, FeCl 3 is oxidizing agent because it has oxidized SnCl 2 into SnCl 4 and itself gets reduced to FeCl 2. Oxygen is the oxidizing agent so it is being reduced. Generally In Photosynthesis Photosystem II oxidized by using electrons from water molecules directly and got exicited ( that is P680*) Where as P700 will exicited with series of electrons. Redox reactions with carbon-containing molecules Photosynthesis is the means by which we get the oxygen we need for life. Substrate-level vs. oxidative phosphorylation. Oxidizing agents or oxidants: An oxidizing agent or oxidant is a substance which oxidizes the other substance and itself gets reduced. The oxidizing agent because it has oxidized SnCl 2 into SnCl 4 itself... 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