Electrochemical Cell EMF Example Problem

The cell electromotive force, or cell EMF, is the net voltage between the oxidation and reduction half-reactions taking place between two redox half-reactions. Cell EMF is used to determine whether or not the cell is galvanic. This example problem shows how to calculate the cell EMF using standard reduction potentials.The Table of Standard Reduction Potentials is needed for this example. In a homework problem, you should be given these values or else access to the table. Sample EMF Calculation Consider the redox reaction: Mg(s) 2 H(aq) → Mg2(aq) H2(g)a) Calculate the cell EMF for the reaction.b) Identify if the reaction is galvanic.Solution:Step 1: Break the redox reaction into reduction and oxidation half-reactions.Hydrogen ions, H gain electrons when forming hydrogen gas, H2. The hydrogen atoms are reduced by the half-reaction:2 H 2 e- → H2Magnesium loses two electrons and is oxidized by the half-reaction:Mg → Mg2 2 e-Step 2: Find the standard reduction potentials for the half-reactions.Reduction: E0 0.0000 VThe table shows reduction half-reactions and standard reduction potentials. To find E0 for an oxidation reaction, reverse the reaction.Reversed reaction:Mg2 2 e- → MgThis reaction has a E0 -2.372 V.E0Oxidation - E0ReductionE0Oxidation - (-2.372 V) 2.372 VStep 3: Add the two E0 together to find the total cell EMF, E0cellE0cell E0reduction E0oxidationE0cell 0.0000 V 2.372 V 2.372 VStep 4: Determine if the reaction is galvanic. Redox reactions with a posi tive E0cell value are galvanic.This reactions E0cell is positive and therefore galvanic.Answer:The cell EMF of the reaction is 2.372 Volts and is galvanic.

Obesity, Diet And Exercise Essay - 1811 Words

Mazen d alqahtani English-111 Obesity, Diet and Exercise Introduction: Obesity is excess of human body fat. The persons accumulating too much body fat are known as obese people. Obesity is an alarming threat globally. In medical terms, the individuals having at least 20 percent higher bodyweight are to be considered obese, which is able to affect their health in negative manners. The persons with BMI (Body Mass Index) from 25 to 29.9 may be considered as over weighted, and they may also have several health Problems. In 1997, the obesity has been declared as a global epidemic with major health implications by WHO (World Health Organization) (WHO, 2001). According to the findings of an annual survey from 1999 to 2000 by National Health and Nutrition Examination Survey, in the United States, the prevalence of obesity and overweight in both youth and children was noted as over 15 percent. While since the 1960s, this figure has been tripled as well (Ogden CL et al, 2003). 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Train Images in the Blues free essay sample

Development of blues musical form use significance of train symbolism in lyrics, focusing on 1950s song Night Train. The purpose of this research is to examine the use of the train as a metaphor in the blues musical form from the 1900s to the 1950s. The plan of the research will be to set forth the context for discussion of the blues by describing how the form emerged in the culture, and then to show, with reference to specific songs, crucial points of connection between the form and the uses to which the image of the train has been put by it. The blues musical form is often described as a subset or form of jazz (Funk Wagnalls; Green 121), and that is perfectly the case to the extent that the blues motif is typical of many jazz performances. Additionally, blues and jazz are associated with the American black socio-cultural experience. But the blues as a musical form has a more reliable provenance in folk music, slave work songs, and Negro spirituals of earlier centuries, and