File Name: oxidation and reduction definition .zip
Oxidation-reduction reaction , also called redox reaction , any chemical reaction in which the oxidation number of a participating chemical species changes. The term covers a large and diverse body of processes. Many oxidation- reduction reactions are as common and familiar as fire , the rusting and dissolution of metals , the browning of fruit , and respiration and photosynthesis —basic life functions. Most oxidation-reduction redox processes involve the transfer of oxygen atoms , hydrogen atoms, or electrons , with all three processes sharing two important characteristics: 1 they are coupled—i. Both reciprocity and net change are illustrated below in examples of the three most common types of oxidation-reduction reactions.
Oxidation can be defined as loss of electron or gain of oxygen or removal of hydrogen. The term reduction indicates a gain of electron or gain of hydrogen or removal of oxygen. According to modern concept, Oxidation means loss of electron and Reduction means a gain of an electron. If one chemical compound loses electron then other must be gaining it which shows oxidation and reduction occur in the same reaction. In a chemical reaction oxidation and reduction occurs simultaneously.
Oxidising agent: Acceptor of electrons. Reducing agent: Donar of electrons. Place a strip of metallic zinc in an aqueous solution of copper nitrate as shown in Fig. After one hour following changes will be noticed. However, there are some exceptions. Compounds such as peroxides. For example, In NaCl.
Oxidation number denotes theoxidation state of an element in a compound ascertained according to a setof rules formulated on the basis thatelectron in a covalent bond belongsentirely to more electronegative element. Common O. The oxidation number of oxygen in most compounds is —2. While in peroxides e. In polyatomic ion, the algebraic sumof all the oxidation numbers of atoms ofthe ion must equal the charge on the ion.
This page discusses the various definitions of oxidation and reduction redox in terms of the transfer of oxygen, hydrogen, and electrons. It also explains the terms oxidizing agent and reducing agent. The terms oxidation and reduction can be defined in terms of the adding or removing oxygen to a compound.
Oxidation—reduction redox reactions — reactions that are connected with electrons transfer from the atom oxidized to the atom reduced. Redox processes — processes where electron transfer between donors and acceptors take place and in any redox transformations causing oxidation states of the two components. Numerous processes from the microenvironment to the macro environment scale dependent to their redox conditions where dynamics are connected with serious oxidation—reduction reactions and can be expressed by redox potential E h or by free electron pressure pe showing the tendency of an environment to receive or to supply electrons in water solution. In a water Skip to main content Skip to table of contents.
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