9:59 Done 3 44 iz-lti-iad-prod.instructure.com AA Return Balance the following redox reaction under basic conditions. Cr2O72 (aq) + C2H6O (l) → Cr³+ (aq) + CO2 (g) Enter your coefficients into the boxes. If there is a substance that is not in your equation, put a O in the box. Please write a 1 in the box for any substance that has a coefficient of 1 in the equation (remember that when we write equations, coefficients of 1 would be implied). Cr₂072-= C2H6O= Cr3+ = CO₂ = H2O = OH = H+= ☑ 8 ☑ ☑ ☑ ☑ ☑ ☑ 3 16 6 112 128 24 ←

9:59 Done 3 44 iz-lti-iad-prod.instructure.com AA Return Balance the following redox reaction under basic conditions. Cr2O72 (aq) + C2H6O (l) → Cr³+ (aq) + CO2 (g) Enter your coefficients into the boxes. If there is a substance that is not in your equation, put a O in the box. Please write a 1 in the box for any substance that has a coefficient of 1 in the equation (remember that when we write equations, coefficients of 1 would be implied). Cr₂072-= C2H6O= Cr3+ = CO₂ = H2O = OH = H+= ☑ 8 ☑ ☑ ☑ ☑ ☑ ☑ 3 16 6 112 128 24 ←

Physical Chemistry

2nd Edition

ISBN:9781133958437

Author:Ball, David W. (david Warren), BAER, Tomas

Publisher:Ball, David W. (david Warren), BAER, Tomas

Chapter8: Electrochemistry And Ionic Solutions

Section: Chapter Questions

Problem 8.10E: For each of the following reactions, determine the overall balanced electrochemical reaction, its...

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Table 17-1 lists common half-reactions along with the standard reduction potential associated with each half-reaction. These standard reduction potentials are all relative to some standard. What is the standard (zero point)? lf is positive for a half-reaction, what does it mean? If is negative for a half-reaction, what does it mean? Which species in Table 17-1 is most easily reduced? Least easily reduced? The reverse of the half-reactions in Table 17-1 are the oxidation half-reactions. How are standard oxidation potentials determined? In Table 17-1, which species is the best reducing agent? The worst reducing agent? To determine the standard cell potential for a redox reaction, the standard reduction potential is added to the standard oxidation potential. What must be true about this sum if the cell is to be spontaneous (produce a galvanic cell)? Standard reduction and oxidation potentials are intensive. What does this mean? Summarize how line notation is used to describe galvanic cells.
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How is the pH scale defined? What range of pH values corresponds to acidic solutions? What range corresponds to basic solutions? Why is pH = 7.00 considered neutral? When the pH of a solution changes by one unit, by what factor does the hydrogen ion concentration change in the solution? How is pOH defined? How arc pH and pOH for a given solution related? Explain.
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An aqueous solution of an unknown salt of gold is electrolyzed by a current of 2.75 amps for 3.39 hours. The electroplating is carried out with an efficiency of 93.0%, resulting in a deposit of 21.221 g of gold. a How many faradays are required to deposit the gold? b What is the charge on the gold ions (based on your calculations)?
Use the following half-equations to write three spontaneous reactions. Justify your answers by calculating E° for the cells. 1. MnO4(aq)+8H+(aq)+5eMn2+(aq)+4H2OE=+1.512V 2. O2(g)+4H+(aq)+4e2H2OE=+1.229V 3. Co2+(aq)+2eCo(s)E=0.282V
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