Chemical Principles
8th Edition
ISBN: 9781305581982
Author: Steven S. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Chapter 11, Problem 76E
A single Hall−Heroult cell (as shown in Fig. 11.22) producesabout 1 ton of aluminum in 24 h. What currentmust be used to accomplish this?
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Using the conditions of spontaneity to deduce the signs of AH and AS
Use the observations about each chemical reaction in the table below to decide the sign (positive or negative) of the reaction enthalpy AH and reaction entropy
AS.
Note: if you have not been given enough information to decide a sign, select the "unknown" option.
reaction
observations
conclusions
A
This reaction is always spontaneous, but
proceeds slower at temperatures above
120. °C.
ΔΗ is
(pick one)
AS is
(pick one)
ΔΗ is
(pick one)
B
This reaction is spontaneous except above
117. °C.
AS is
(pick one)
ΔΗ is
(pick one)
This reaction is slower below 20. °C than
C
above.
AS is
|(pick one)
?
18
Ar
1
Calculating the pH at equivalence of a titration
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Your answer is incorrect.
0/5
a
A chemist titrates 70.0 mL of a 0.7089 M hydrocyanic acid (HCN) solution with 0.4574M KOH solution at 25 °C. Calculate the pH at equivalence. The pK of
hydrocyanic acid is 9.21.
Round your answer to 2 decimal places.
Note for advanced students: you may assume the total volume of the solution equals the initial volume plus the volume of KOH solution added.
pH
=
11.43]
G
00.
18
Ar
B•
Biological Macromolecules
Naming and drawing the products of aldose oxidation and reduction
aw a Fischer projection of the molecule that would produce L-ribonic acid if it were subjected to mildly oxidizing reaction conditions.
Click and drag to start drawing a
structure.
X
AP
‡
1/5
Naor
Explanation
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Chapter 11 Solutions
Chemical Principles
Ch. 11 - Prob. 1DQCh. 11 - Prob. 2DQCh. 11 - You want to “plate out” nickel metal from a nickel...Ch. 11 - A copper penny can be dissolved in nitric acid but...Ch. 11 - Sketch a cell that forms iron metal from iron(II)...Ch. 11 - Which of the following is the best reducing agent:...Ch. 11 - You are told that metal A is a better reducing...Ch. 11 - Explain the following relationships: G and w, cell...Ch. 11 - Explain why cell potentials are not multiplied by...Ch. 11 - What is the difference between andWhen is equal to...
Ch. 11 - Prob. 11DQCh. 11 - Look up the reduction potential for Fe3+toFe2+ ....Ch. 11 - Prob. 13DQCh. 11 - Is the following statement true or false?...Ch. 11 - What is electrochemistry? What are redox...Ch. 11 - When magnesium metal is added to a beaker of...Ch. 11 - Prob. 17ECh. 11 - How can you construct a galvanic cell from two...Ch. 11 - Prob. 19ECh. 11 - Prob. 20ECh. 11 - Prob. 21ECh. 11 - Consider the following galvanic cells: For each...Ch. 11 - Prob. 23ECh. 11 - Prob. 24ECh. 11 - Answer the following questions using data from...Ch. 11 - Prob. 26ECh. 11 - Using data from Table 11.1, place the following in...Ch. 11 - Prob. 28ECh. 11 - Use the table of standard reduction potentials...Ch. 11 - Use the table of standard reduction potentials...Ch. 11 - Prob. 31ECh. 11 - A patent attorney has asked for your advice...Ch. 11 - The free energy change for a reaction G is an...Ch. 11 - The equation also can be applied to...Ch. 11 - Prob. 35ECh. 11 - Glucose is the major fuel for most living cells....Ch. 11 - Direct methanol fuel cells (DMFCs) have shown...Ch. 11 - The overall reaction and standard cell potential...Ch. 11 - Calculate the maximum amount of work that can...Ch. 11 - Prob. 40ECh. 11 - Prob. 41ECh. 11 - Chlorine dioxide (ClO2) , which is produced by...Ch. 11 - The amount of manganese in steel is determined...Ch. 11 - The overall reaction and equilibrium constant...Ch. 11 - Prob. 45ECh. 11 - Calculate for the reaction...Ch. 11 - A disproportionation reaction involves a substance...Ch. 11 - Calculate for the following half-reaction:...Ch. 11 - For the following half-reaction AlF63+3eAl+6F...Ch. 11 - Prob. 50ECh. 11 - The solubility product for CuI(s) is 1.11012....Ch. 11 - Explain the following statement: determines...Ch. 11 - Calculate the pH of the cathode compartment for...Ch. 11 - Consider the galvanic cell based on the...Ch. 11 - Prob. 55ECh. 11 - Consider the following galvanic cell at 25°C:...Ch. 11 - The black silver sulfide discoloration of...Ch. 11 - Consider the cell described below:...Ch. 11 - Consider the cell described below:...Ch. 11 - Prob. 60ECh. 11 - Prob. 61ECh. 11 - Prob. 62ECh. 11 - What are concentration cells? What is in a...Ch. 11 - A silver concentration cell is set up at 25°C as...Ch. 11 - Consider the concentration cell shown below....Ch. 11 - Prob. 66ECh. 11 - Prob. 67ECh. 11 - An electrochemical cell consists of a nickel metal...Ch. 11 - You have a concentration cell in which the cathode...Ch. 11 - Consider a galvanic cell at standard conditions...Ch. 11 - An electrochemical cell consists of a zinc metal...Ch. 11 - How long will it take to plate out each of the...Ch. 11 - What mass of each of the following substances can...Ch. 11 - It took 2.30 min with a current of 2.00 A to plate...Ch. 11 - The electrolysis of BiO+ produces pure bismuth....Ch. 11 - A single HallHeroult cell (as shown in Fig. 11.22)...Ch. 11 - A factory wants to produce 1.00103 kg barium...Ch. 11 - Why is the electrolysis of molten salts much...Ch. 11 - What reaction will take place at the cathode and...Ch. 11 - What reaction will take place at the cathode and...Ch. 11 - Prob. 81ECh. 11 - a. In the electrolysis of an aqueous solution of...Ch. 11 - A solution at 25°C contains 1.0 M...Ch. 11 - An aqueous solution of an unknown salt of...Ch. 11 - Consider the following half-reactions: A...Ch. 11 - An unknown metal M is electrolyzed. It took 74.1 s...Ch. 11 - Electrolysis of an alkaline earth metal chloride...Ch. 11 - Prob. 88ECh. 11 - What volume of F2 gas, at 25°C and 1.00 atm, is...Ch. 11 - Prob. 90ECh. 11 - In the electrolysis of a sodium chloride solution,...Ch. 11 - What volumes of H2(g)andO2(g) at STP are...Ch. 11 - Copper can be plated onto a spoon by placing the...Ch. 11 - Prob. 94AECh. 11 - Prob. 95AECh. 11 - Prob. 96AECh. 11 - Prob. 97AECh. 11 - Prob. 98AECh. 11 - Prob. 99AECh. 11 - Prob. 100AECh. 11 - Prob. 101AECh. 11 - Prob. 102AECh. 11 - Prob. 103AECh. 11 - Prob. 104AECh. 11 - In 1973 the wreckage of the Civil War ironclad...Ch. 11 - A standard galvanic cell is constructed so that...Ch. 11 - Prob. 107AECh. 11 - Prob. 108AECh. 11 - Prob. 109AECh. 11 - Prob. 110AECh. 11 - Prob. 111AECh. 11 - Prob. 112AECh. 11 - Prob. 113AECh. 11 - Consider a galvanic cell based on the following...Ch. 11 - Prob. 115AECh. 11 - Prob. 116AECh. 11 - Prob. 117AECh. 11 - Prob. 118AECh. 11 - Prob. 119CPCh. 11 - Prob. 120CPCh. 11 - A zinccopper battery is constructed as follows:...Ch. 11 - Prob. 122CPCh. 11 - Prob. 123CPCh. 11 - Prob. 124CPCh. 11 - Prob. 125CPCh. 11 - Prob. 126CPCh. 11 - Prob. 127CPCh. 11 - Prob. 128CPCh. 11 - Prob. 129CPCh. 11 - Prob. 130CPCh. 11 - Prob. 131CPCh. 11 - Prob. 132MPCh. 11 - Prob. 133MP
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