Gain electrons reduction

Two commonly used redox / V I reaction memorization aids are 1) LEO the lion goes GER (Lose Electrons Oxidation, Gain Electrons Reduction) and OIL RIG (Oxidation Involves Loss of electrons, Reduction Involves Gain of electrons). 

Because the Zn electrode lost electrons (oxidation), it is called the anode (remember the mnemonic device AN OX ). The Cu electrode gained electrons (reduction) and is called the cathode (remember the mnemonic device RED CAT ). The anode is considered to be the negative electrode in the voltaic cell and the cathode is considered to be the positive electrode. 

Complete the concept map using the following terms decreases, half-reactions, gain electrons, reduction, lose electrons, redox reaction, oxidation, increases. 

Oxidation-reduction potentials are expressed in volts relative to the standard hydrogen electrode at 0 volts, and represent the tendency of a compound to lose electrons (oxidation) or gain electrons (reduction). Various enzyme systems in respiration reactions (e.g., the cytochromes) utilizing ascorbic acid, hemoglobin, as well as reactions in the Krebs cycle (succinic and fumaric acids) involve electron transfers. Drugs can affect all these systems, and the consequences must be taken into account. 

When a metal (M) is immersed in a solution containing its ions (M ), several reactions may occur. The metal may lose an electron (corrosion) to form metal ions or the metal ions in solution gain electrons (reduction) and enter the solid metal state. The equilibrium across the metal-solution interface controls which reaction, if any, will occur at the metal-electrolyte interface. Because the equilibrium is determined by the equality of the partial Gibbs free-energy or chemical potentials (//) on either side of the electrode interface (i.e., Absolution=A dectrode). when any metal is immersed in the electrolyte, thermodynamics... 

Students may be familiar with two good mnemonics for redox reactions (1) LEO the lion says CER Lose electrons oxidation, gain electrons reduction, and (2) OIL RIG Oxidation /hvolves loss of electrons, reduction /hvolves gain of electrons. 

Many authors have suggested mnemonics for oxidation and reduction. One of the most common is "LEO goes CER," for lose electrons = oxidation, and gain electrons = reduction. 

Heipfui mnemonics Oil RiG-Oxidation Is Loss Reduction Is Gain. LEO GER—Lose Electrons Oxidation Gain Electrons Reduction. 

Notice that oxidation and reduction must occur together. If one substance loses electrons (oxidation), then another substance must gain electrons (reduction). For now, you simply need to be able to identify redox reactions. In Chapter 16 we will examine them more thoroughly. 

For example, if zinc metal is immersed in a solution containing copper ions, a redox reaction occurs (Figure 14-1). The zinc loses electrons (oxidation) and the copper ions gain electrons (reduction) ... 

Definitions of the anode and the cathode are among basic definitions in electrochemical corrosion. The area of the metal surface that corrodes i.e., where the metal dissolves and goes into solution) is called the anode. The cathode is the area of the metal surface that does not dissolve. In the literature of electrochemistry, reduction and oxidation reactions are defined as when metals lose electrons i.e., oxidation) or gain electrons (reduction) ... 

To help yourself remember which reaction is oxidation and which is reduction in terms of electrons, memorize the phrase LEO goes GER (Lose Electrons Oxidation Gain Electrons Reduction). 

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